How to troubleshoot car light problems, such as lights not turning off or one-on one-off.
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- čas přidán 5. 07. 2024
- Sooner or later your car is likely to have light problems. It could be caused by bad light bulbs, fuses, switches, relays, battery , or simply loose or shorted wires. The light problem might be that one side is on and the other side is off. It could be that lights are always on or won't turn on at all. Or they could be flickering. This video discusses ways to test and eliminate possibilities so that you can quickly focus on the real faulty components. This method can be applied to other electrical circuit, the 6 steps should be:
1. draw a electrical diagram
2. measure every exposed points.
3. mark the measured points on the electrical diagram.
4. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
5. once the search is narrowed, remove the faulty component for test.
6. And repeat from #3
Index
0:00 car light overview problems
0:27 typical car light circuit diagram
0:47 problem 1: lights are always on
1:07 brake switch
2:13 three ways to force bulb off
2:55 problem 2: left light off & right light on
3:36 two lights in same bulb
4:30 all lights are off
5:26 other lights circuit diagram
5:46 lights flickering - Jak na to + styl
Out of all the videos I’ve seen yours is the most organized. Thanks!
thank you for taking the time to provide feedback. Yes, since there are many components connected, any of them could fail, thus a systematic way to organize will make it easier to troubleshoot.
E
Thank you! your video helped me today with my brake light
Thank you. You did a great job
Great video easy to follow 👍
Glad it helped
Great way of explaining
thank you.
Thank you, my problem was fix 💕
Very helpful thank you
Thank you for taking the time to provide feedback.
This is great! Thank you
Thank you for taking the time to provide feedback.
My problem is not the brake light it's the tail lights on my car that won't cut off. The mechanic replaced the switch for the brake light and but that was not the problem. It's the taillight and I cannot find any solution online for this problem. The dashboard lights are coming on and stick in also when the engine is off. Does anybody have a solution?
Excellent 👍👍
Very very helpful thanks to her
Thank you for taking the time to provide feedback, your comments will help other viewers.
Ur the Best Sir thanks
thank you for taking the time to provide feedback.
Well explained
Thank you for taking the time to provide feedback.
Nice video 👌
Thank you for taking the time to provide feedback.
do you know why my light on my windshield is not working? i have a chrysler 300 2005 both right and left work when i break but not the top windshield one
2019 nissan altima passenger side fog like wont turn on when light are on but will flash when locking vehicle?
how about if the car is off, one of the brake light is still on. how do i deal with it? thanks!
Can you help me - my left "eyebrow" led strap line is on when I put a contact, but it's off when engine starts. Can you tell me what can be a problem? Thanks
i.hope you can help me with my 05 Toyota Prius. The dealers are going to burn me to replace my rear brake lights. Unfortunately, my friend borrowed my car when the brake lights went out. Well, today, I took a chance to get to the store, I was going to use my hazard lights should anyone be behind me if I stopped, but they don't work either. My check engine light has been on for a while, but it's set like that so you get regular maintenance after reaching so many miles, so I already have to go to the thieving Toyota dealers. That always cost $350 plus what they can scare me out of! Please.help with any advice about my brake and hazard lights. I suppose I better check and see if I have any lights at all! Thank you!
Great video, very informative. I have an '07 Nissan Versa. The brake lights work when the tail lights are off. However, when the tail lights are on, the brake lights do not work. I'm guessing it's a wiring problem, however if you or anyone have seen this issue before, a solution would be great!
1. does the Center Mounted Light (on high top) work?
2. just a reminder or something to be aware to help you to debug: the brake lights and the tail lights may be on the same globe, some cars may have a dual filament bulb that acts as a dual purpose bulb. When lights are on they are tail lights, when service brake is pressed the second filament is activated acting as a brake light.
3. sometimes when ground wire has weak connection, it may not show failure until higher currents go through ground wire. So when you want both brake and tail lights work at the same time, the ground wire may fail.
4. you should fill in the following table of 8 combinations, to see which of the 8 combinations fail:
center brake tail
===============
4.1 on on on
4.2 on on off
4.3 on off on
4.4 on off off
4.5 off on on
4.6 off on off
4.7 off off on
4.8 off off off
@@GeniusAsian Thanks for the information! I took it get looked at and you are right, the bulb does have dual filament. However, the issue was the bulb socket. Once replaced, the lights worked as designed!
I have 2005 Buick allure. Rear lights work when car on or in standby. But when off and press brake pedal they do not work.
Any thoughts on side lights front and rear and interior lights also display screen backlit turning on by themselves with the vehicle turned off and locked and not touched for hours, my van ford custom 2017 has just started doing this
copied from the video description
This video discusses ways to test and eliminate possibilities so that you can quickly focus on the real faulty components. This method can be applied to other electrical circuit, the 6 steps should be:
1. draw a electrical diagram
2. measure every exposed points.
3. mark the measured points on the electrical diagram.
4. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
5. once the search is narrowed, remove the faulty component for test.
6. And repeat from #3
Very good
Thank you for taking the time to provide feedback.
My 01 Sequoia parking lights come on sometimes when the Sequoia is off. And this will drain my battery. I guess I should check the light switch, parking light relay, tow light connections? Anything else that may cause this?
there are 5 parts: battery, fuse, switch, light bulb, wire. You can test each part and "eliminate" the one that you demonstrate to be a working part. Since the light is on sometimes, you may assume the light bulb is working, the fuse is working, the battery is working. The switch has higher probability to fail, you should test it.
Do you have rats in your car? Rats like to chew wires. (no kidding, I have seen rat's dropping in cars) Once the wires are exposed, it may cause shorts, thus could cause lights turning on.
My middle brake light works fine and turns on and off based on the brake peddle but my two that are on the left and right stay on! Any advice?
since your "light works fine and turns on and off based on the brake peddle", it is likely your brake switch works. So trace the wiring
I’ve got a problem with my left tail light when I turn my head lights on the left tail light doesn’t turn on right away only after about 15 mins of driving it starts to work. All brake lights work fine it’s just the left tail light doesn’t work right away, any idea what’s causing this?
1. what would happen if you swap left light bulb and right light bulb?
2. when the light is not on, if you measure the voltage at the bulb socket, does it show any voltage?
What if your honda accord trunk brake lights only work when running lights are turned on ? My 3rd brake light works normal
What is a "trunk brake light?" is it a trunk light or is it rear brake light?
What is "3rd brake light?" How do you name 1st, 2nd or 3rd?
My Zafira issues are the brake light s work when you start the car for around 1 minute then they stop working crazy any help would be greatly appreciated...
there are 5 parts: battery, fuse, switch, light bulb, wire. You can test each part and "eliminate" the one that you demonstrate to be a working part. Since the light is one for 1 minute, you may assume the light bulb is working. (Note that in rare condition the light bulb may be faulty, but you have already tested the other four part, then, can you test the light bulb and to wait for 1 minute to see if the light bulb is still working?)
Is your battery working fine? After 1 minutes, does the light bulb go out or does it dim darker?
The switch has higher probability to fail, you should test it.
Do you have rats in your car? Rats like to chew wires. (no kidding, I have seen rat's dropping in cars)
Hi I have Holden commodore equipe 2005. For the last few weeks I can see the left side lights remain on, I therefore unplug the fuse to save battery. All lights are ok, but not sure why if I put the fuse, left side lights become on. Can you pls tell me how to fix it. I went to a local service center who was telling about the settings problem and asked for 1200 dollars. But I can see the car lights switched off during the cold days, but putting me on trouble on hot days. Pls let me know if you have any suggestions?
we don't have this kind of car in US, but I think they are pretty similar, so you need to check to see if the switch is faulty, if the switch is fine, then trace the wire
Hi just wanted to ask, on my 2010 kia cerato my left break light stays on even when the car is off. I have also swapped the bulb but came up with the same problem, any solutions?
when you said " I have also swapped the bulb but came up with the same problem, any solutions", I assume your "same problem" means the left break light stays on. Does the left break light turns on when while driving without breaking?
You may want to check the break switch first, if the switch is fine, then check left wires.
i have an issue where the light doesn't stay on, the right tail light, and license plate turn of when i have the car on. when i press the breaks the lights turn on but dont stay on, replaced the wire harness and still... they work but wont stay on and its the right side only
Hi and thanks for the video explanation.
I have a passat vw 2006. My right parking light will turn on for 1 second then turns off. Can you please advise? All other lights are working properly.
Thanks.
Did you find a solution? I think we have issues in the ground wire at the connector. My Audi does the same after 30 mins. I’m about to try to fix it myself my cleaning the connection with a little sandpaper or electrical brush then add a little dielectric grease to prevent needing to do it again. I’ll let you know if it works
I had the problem with my left light not lighting, however I’m using led reverse bulbs. I already swapped both sides and the only time it seems to turn on is when I put a standard bulb as opposed to the led. Any idea what it could be
LED reverse bulbs may not be compatible with all light fixtures or sockets in your vehicle. Make sure the bulb's size, shape, and electrical specifications match the socket and housing of the light you intend to replace.
I once noticed that my left front light was completely off (for long and close distance), I drove an hour or so and checked again and it was on! What could that be?
many possible reasons: 1. water went into somewhere and made short. 2. switch is bad. 3. loose wire
Any help would be great!
if you have volt meter, you may trace the wire connection while the light is turned on
for the rear tail parking lights of a mk 4 gti there is a fuse for left and right
Thank you for taking the time to chime in, your comment may help other viewers
I'm having and issue all the lights are working but the running light on the back drivers side isn't coming on. All the bulbs light up the brake lights the turn signal but it doesn't come on when you turn the lights on help plz
did you check the fuse?
Does this also apply to a 2006 Ford Mustang? My right brake light and right running light stay on
man I'm having the exact same problem in a 05 mustang
@@jessetaylor7849 me too bro did u fix it?
This video discusses ways to test and eliminate possibilities so that you can quickly focus on the real faulty components. This method can be applied to other electrical circuit, the 6 steps should be:
1. draw a electrical diagram
2. measure every exposed points.
3. mark the measured points on the electrical diagram.
4. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
5. once the search is narrowed, remove the faulty component for test.
6. And repeat from #3
You can possibly cause problems or damage with newer vehicles that as more complex systems by removing the battery cable while the vehicle is running
correct, voltage spikes may damage electronics, so it is better you remove corresponding fuses if you don't have any other tools at hand
I was just driving at night and everytime i would break my instrument panel lights would go off and my tag plate lights would go on(off while driving), one of my taillights is off and the bulb is new.
make sure you understand brake light is different than tail light. Your description is not very clear which switch is on or off while what action did you take, if you can make a truth table listing all the combination of the the switch changes and the light condition, it would be easier to location the problem. Without knowing the truth table, in general you may use ohm meter to check circuit to ground, press your brake while measuring the voltages to trace the problem.
The whole left side assembly of lights are off. The signal light, the beam light and the brake light, the left front parking light. The whole left side. The bulbs seem to be good. Idk what can be wrong...any idea?
trace the wires
when i switch off heal lights, my break lighs work well... and when i switch on the head lights, the break lights dont work... is any solution? plzzz
Anyone know what fuse to take out as my rear brake lights wont turn off.....definitely is that little piece up under brake pad but it's hard to get up under it for me
you said " brake lights wont turn off.....definitely is that little piece up under brake pad", the brake light switch is under the dashboard, but the brake pad is the mechanical part, not related to the electronic component (see the circuit diagram). If you want to find out the fuse, for some cars there are two places for the fuse box. One is under the hood, the other is inside the car under the dashboard.
I have a 2008 honda accord my passenger side taillights work and when I brake even but the driver side is just not responding new bulbs in both left and right back side of the car please help
as noted in the video:
1. swap the left and right bulbs, let us know the results.
2. if you still have driver side problem, then see if you got voltage on the socket of the driver side. If you don't see voltage, then trace the wire.
I forgot to disconnect the battery when splicing into a 12 volt wire to run my sirius radio. It sparked. Now, none of my interior lights work or the dash lights. I checked the fuse and it's not blown. So, according your diagram, it's a switch or the wire fried somewhere down the line. I'm going to look at the switch next.
note that this caravan has two fuse boxes, the first one is inside the car under the steering wheel, the second is outside under the hood next to the battery.
I have a Lincoln towncar 2004. When I turn the car on the trunk light says the trunk isn't closed properly but it is. The interior lights come on the car starts a warning ticking and headlights and tail lights come on. Also the seat belt alarm dings when I have the seat belt on. When I shut the car off the lights will not go off. I have to disconnect the battery every time. Any suggestions?
instead of to disconnecting the battery every time, have you tried to disconnect individual fuses one at a time? Try to trace the wires and test to eliminate each parts suspects on your circuit diagram
I have Audi A4 b7, and my backlights turn at night from 3am and wont turn off, sometimes unlockig/locking car helps sometimes not. Lights wont turn on during day, its just fine. This happens continuously night after night, and sometimes 3 4 nights they`re off. Its driving me crazy. Any advice sir?
when you said "backlights", what are the backlights, is it tail light or brake lights? If they are brake lights, you can check the brake switch.
Help, my left tail light does not come when I turn on the switch. But it does come on right away when I get out and tap on the lense. I have taken it off and sand papered where ever I could. Still does the same thing. The bulbs are good.
if you are really sure the light is supposed to be off (sometimes if you did not turn off the light after you left the car, the light may be off after a few minutes), then you should measure the voltage at the bulb when the car is running, if there is no voltage, then you can trace the wires. When you car is not running and the light is on, then you can measure the voltage at the switch to see if the switch is stuck and trace the wire.
@@GeniusAsian I swapped left and right light assembles and the problem switched over to the other side so I just ordered a new tail light assembly.
@@QLFProductions thank you for taking the time to share your results, your solution will help many other viewers
@@GeniusAsian NP
Hi iv got a toyota yaris, brake light in centre of rear window is working but the the 2 actual brake lights don't, if changed bulb and checked fuse, still nothing, any ideas guys
If you have a multimeter, you can trace to see if any voltage at the bulbs, if not, then trace to see brake switch etc. Also from comments of this video, many people are not aware there are differences between taillight/parking light and brake light. Very common they are in the same bulb, if they are duel filament bulbs it is very well possible that only one filament is blown and not the other.
Hey everyone. I have a similar issue. When I turn on my headlamps. When I hit the brakes both tail lights cut out, when I step off the brake pedal the rear tail running lights turn back on. The only light that works when I brake is the light on top of the tail gate. Please help anyone. Thanks.
ok so what if my brake lights work, but turning on my headlights causes them to stay on, and also the turn signals work except when the headlights are on and then only the left signal works, and also pressing the brake pdeal and using the right signal cause the dash lights to go dim? When I remove the right brake/turn signal bulb everything functions normally. guess I need the 'level 2' video lol.
copied from the video description:
"This video discusses ways to test and eliminate possibilities so that you can quickly focus on the real faulty components. This method can be applied to other electrical circuit, the 6 steps should be:
1. draw a electrical diagram
2. measure every exposed points.
3. mark the measured points on the electrical diagram.
4. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
5. once the search is narrowed, remove the faulty component for test.
6. And repeat from #3
My left front parking light doesn’t turn on but left signal light does. Isn’t it the same bulb? How can i fix this?
is your light bulb the "
Dual Filament Bulb"? (One for turn signal and another for parking brake ) Maybe one filament is burned out.
Would anyone have a suggestion for my issue?
My VW Passat 2011 (facelift model - Ireland) rear right tail light **sometimes** doesn't turn on, but a light smack on the light unit from outside turns it back on. I've already ripped the trunk apart looking for faulty wiring, I've replaced the bulb several times, I've cleaned all contact points and pinched any clips to be tighter to get better contact but the same issue still occurs. I'm honestly out of ideas, so maybe a new perspective would help. Thanks!
Yes, the on-and-off situation is difficult to debug because you don't know how to reproduce the failure conditions. Two possible conditions: bad connection or short. If there is short, then it may have burned something, so it is unlikely. If it is caused by loose wire or bad contacts, then you need to test each inch of wire and every contacts. There are at least two wires going to the bulb, so you also need to check both of these two wires.
Alternatively, you could also try to use a good wire to bypass one of the wires connected to the bulb. After the bypass, if your problem disappears, then it is that wire that caused the problem. When you perform the bypass, make sure you know which wire is hot, which one is ground, so that you don't cause the short from hot to ground. Let us know your result, this will help other people.
@@GeniusAsian Thanks for the tips, I'll try to get it done next week, though with lockdown I don't really drive anywhere lately, so might be a while before I can make conclusions. But I will definitely check back and report the results. Thanks again.
I have a specific problem. When i turn on the light switch, the brake light is on. And when i press the brake, the park light is on. So when i turn on the light switch, the bulb does not reach to the brake i press. What could be the issue?
the brake light bulb has two filaments (other bulbs may have only one), make sure you don't replace a wrong type of bulb. There could be different type of problems causing the same thing that you have described, for example shorts or ground faults or switch. That is why you should follow the the 3 steps shown in the video:
1. draw a electrical diagram and measure every exposed points.
2. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
3. once the search is narrowed, remove the faulty component for test.
good luck and it could be fun to diagnose the problem if you follow the correct process. And let us know your result so that your result will help other viewers, thanks
My left rear light is out I changed the bulb when I press the break my left rear won't light up but the right does when I release the pedal the left comes on the right goes off
use a multimeter to measure the voltage, press the break and measure the socket, and then release and then measure.
Tnx
Thank you for taking the time to provide feedback.
I have the second case where my right side is off but the weird thing is that it turns on when I press the brake
Did you measure the resistance of the bulb? In many vehicles, the brake lights and the tail lights may be located in the same bulb. Tail lights are engaged when the you turn on your headlights or when your parking brake is on, whereas the brake lights will light up immediately when you apply pressure to the brakes.
DRIFT STYLE
I don't know if I mentioned in my last comment to say my car is a 2011 Subaru Outback and it's not the brake light that is the problem it's the tail lights that are staying on also the console lights sometimes it gets stuck too.
when you say "sometimes it gets stuck", you need to measure and record your testing data when it gets stuck. The most important thing is #1 items in my list, if you have that diagram then the rest will become easy
different car may or may not have different circuit.
, the 6 steps should be:
1. draw a electrical diagram
2. measure every exposed points.
3. mark the measured points on the electrical diagram.
4. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
5. once the search is narrowed, remove the faulty component for test.
6. And repeat from #3
Great video, but what if your right taillight function perfectly and the left one only turns on when the brakes are pressed
did you check the bulb?
@@GeniusAsian I put a new bulb in. Right taillight turns on and when I press the brakes it gets brighter like it should. The left taillight only turns on when I press the brakes. I’m lost 🤔
@@jaymen8302 when you say "I put a new bulb in" it is not clear the new bulb is on the right or left? Also be aware car light may be dual filaments, make sure you know which is which.
@@GeniusAsian i put a new bulb in on the left side where the bulb only turns on when I press the brakes but then turns off completely when I let go of the brakes. The right bulb stays on like it suppose too and go brighter when I press the brakes like it suppose too. Idk what it could be
@@jaymen8302 I'm having the same problem and I can tell that this lady only really knows the basics or at least the not complex mechanics. Anyways, guessing you probably solved the problem or took it to get it solved, which I wanna ask did you found out what the problem and how it got fixed? Like, what had to be done?
My entire left hub won't work. Running light and brake light. 3 years now can't figure it put
Hello I have a dodge 1997 when I turn the lights on the back light works but when I brake it does not light up. Please help. I have changed the brake switch the light bulb and fuse are fine. Thanks
both left and right light go off at the same time?
@@GeniusAsian only one works when I brake
@@jackieaguirre8318 as shown in the video, what happens if you swap the left light bulb with the right light bulb?
ugh. i’ve changed the battery, bulbs, brake switch, fuse, and still nothing. illl check the grounding issue and wires. doesn’t sound fun.
My left brake light turns on like it’s supposed to but when I press the brake it turns off I replaced the bulb already and same thing any suggestions ?
you said: "My left brake light turns on like it’s supposed to but when I press the brake it turns off I replaced the bulb already and same thing any suggestions ?" I don't know if you have a typo in your question or not, but I see contradiction in your question: the two things "brake light turns on like it’s supposed to" and "when I press the brake it turns off" contradict each other, because if I "when I press the brake it turns off" then it is not "it’s supposed to", correct?
@@GeniusAsian so you know when you turn on your headlights the tail lights also turn on so that works everything turns on however when I press the brake the left tail light turn off while the right and overhead brighten up. Does this make a little more sense ?
@@GeniusAsian i already replaced the bulb and checked the fuses and both are good
@@CarlosDanielBarragan-nt1hh still does not make sense, why would your brake lights on when you turn on your headlights? Are you confused brake lights with tail lights?
Thanks! I have one light that stays on…Will check the other bulb! Hopefully it is that simple - bad bulb and bad switch..
if one light stays on, it is unlikely it is due to a bad bulb. Does the other light stay on?
@@GeniusAsian thanks man. The other light worked normally. I was using a trailer light kit on the problem side - removed the trailer adapter - and working fine - so a short or bad ground I guess.. still a success!
@@chrismackay8314 Thank you for taking the time to share your result. This will help many other viewers
My kia Sportage 2012 brake lights make me crazy 😧 when i start thr car sometimes brake lights is working continuously and i turn off the car , next day i start the car brake lights not working, any advise ?
what do you mean by "brake lights is working continuously"? did you mean the light is stuck and the switch is not working?
So I have a 86 montecarlo ls I have lights on the front right side only and on the left rear side only
first try this: take the one light bulb working and put it in the socket of the light not working, and see what happens
@@GeniusAsian did all tha new fuse new bulbs,fuse box putting right amount of power ,headlight dimmer switch new ,
@@toonse3683 when you said "fuse box putting right amount of power", how did you measure the "power"? Did you mean voltage or current? Also what do you mean "headlight dimmer switch new"?
can anyone help me with my tail lights staying on? i have no brake lights if that makes sense! i have a 2010 hyundai sonata
I copied the video descriptions of this video. This video discusses ways to test and eliminate possibilities so that you can quickly focus on the real faulty components. This method can be applied to other electrical circuit, the 6 steps should be:
1. draw a electrical diagram
2. measure every exposed points.
3. mark the measured points on the electrical diagram.
4. construct a truth table (as shown in this video) to eliminate good components and further narrow the search to trace the circuit.
5. once the search is narrowed, remove the faulty component for test.
6. And repeat from #3
Don't leave the battery cable off of the battery too long while the engine is running, it will burnout your alternator. By the way I own the exact same Caravan as you, except its a few years older and V6 powered.
Me 3⚡😎🌞
Where should I start my diagnosis if both my headlights and tail lights are working... just not at the same time...
interesting problem, can you give us more details on the conditions working vs not working?
1. condition for headlights are working but tail lights are not working.
2. condition for headlights are not working but tail lights are working.
3. condition for headlights are working and tail lights are working (does it ever work?)
Without knowing your car, it is difficult to diagnose it. In general, keep in mind a few points:
4. Two lights in one bulb. Since you said both "headlights and tail lights are working" the light bulbs should be good, but as shown in the video the same bulb has two different lights, so you should not draw a wrong conclusion the bulb is good because the lights came from the same physical location.
5. Generally when you flip the headlight switch that also turns on your tail lights.
6. Some models have taillights on an automatic sensor which turns tail lights on when it detects a drop in ambient brightness. So you should examine if you got a bad Ambient Light Sensor
@@GeniusAsian it's a g35... basically when I turn the head lights to on auto fog or whatever I cannot seem to find a setting where both tail lights and headlights are on at the same time... one click headlights will work tail lights wont... next click over tail lights are on but headlights are not
@@mustafagak2852 Since you may have multiple suspected components at fault, and they are not in series, there are two different ways to troubleshoot. One is to remove the high probability of faulty components to test. The second is to collect as much testing data with different permutation, these permutation will reduce the number of removal tests. To answer the permutation of my original question 1 and 2, your description of "one click headlights will work tail lights wont... next click over tail lights are on but headlights are not" does not provide enough information. If you spend a little more time to describe what is this "one click, next click", then your information will be more useful.
In addition, you should expand the permutation to include other components, for example question 7:
7. do tail lights go on when you press the brake? (I assume when the brake's not pressed tail lights not on, right?) (I also assume you understood you understand my point 4, two lights in same bulb)
Appreciate the quick replies... and I apologize if I'm not in depth enough with my comments as my dog is in labour atm and my attention is mainly towards her but I will upload a video to show you more of what I'm talking about... as for the one click headlights work one click tail lights work I was talking about the switch on the lever by the steering wheel that controls the headlights... should be off auto on or something.... the price that controls the wipers
@@GeniusAsian sorry I've been really busy... my dog had a litter of 11 pups... I will try and get an update for you today or tomorow... once again really appreciate the help!
i have problem two on both sides (left lower bulb and right upper bulb) but changing the bulbs did not fix the problems and my fuses pass multimeter checks, my battery is new and in good condition. what is going on
so what is your problem? Always on or always off?
@@GeniusAsian always off. i replaced the bulb in the lower left socket and it did not change the result. i have a hyundai i30 hatchback so two lights on either side.
when you use your multimeter to read the terminals at the sockets, what is the voltage?
@@GeniusAsian the bulb sockets? i was having trouble with them because they’re mostly plastic except the interior but i got very low and inconsistent numbers for the working socket and nothing for the non working one. 0.00 on the multimeter. maybe 0.05 on the working one? not sure. it wasn’t consistent. all fuses were 10-11
@@kel292 I assume when you measured voltage, your switch is turned on. As shown in the video, the battery, fuse, switch, bulbs, wires are connected serially, if any of them failed, then the light is off. So out of the 5 components, you only showed that the bulbs may work (measure the resistance of the bulb may confirm it), what did you do for the remaining 4 components?
Never disconnect the battery terminal while the car is running it could most likely ruin the alternator on many vehicles
yes, could cause problem to either the car electronic parts or the alternator, the risk probability is higher to cause problems to other electronic parts because if your alternator is over-charging your battery with higher voltage, disconnecting it may allow the alternator to provide an even higher voltage to sensitive car electronics. So be careful with newer car with sensitive electronic components.
Why are all my lights out except 1 headlight
Good method to diagnose, easy to follow, but disconnecting the battery on newer cars while running can cause serious damage.
Stay safe, Joe Z
thank you for taking the time to chime in
👌
OMG! What did you do to your hair?! You look kinda crazy. But have been a fan of your genius videos. I’d prefer follow a sane scientist than a crazy genius! Lol
I have been considering some alternative intro and outro, what do you suggest? Thanks.
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@@GeniusAsian 👍
So all of the rear lights work fine when opening and closing the doors. So the bulbs are good, the battery is good, the alternator is good. The problem is that the left driver's side rear brake light won't come on when I press the brake pedal. The other side comes on though. I'm thinking the problem is a broken wire between the left and right brake light. Anyone else have this same problem? I have already replaced the bulb even though the old one was still good hoping it would somehow fix it, of course it did not.
be aware that there are two filament, so the brake lights and parking lights are different.
@@GeniusAsian Yep that was it, one of the filaments was burned out in the bulb.
@@TheLastWizardmy lights work, but when I hit the brakes only one side goes bright and the other turns off completely.. how did you fix ur problem? Idk what a filament is
@@antonygimed7262 Filament is just a tiny little squigly wire inside a light bulb. Incandescent lights have them. Most car lights are incandescent still, eventually they will all be LED. So your brake light has two filaments, or two of the little wire thingys that a regular light bulb has. You know when you shake a regular light bulb and if it has a tingy rattle sound it's no good. That means the filament is broken.
I'd start with just buying a set of light bulbs for your car, they are less than 10 bcks for two of them. Then just youtube how to change the brake light bulbs for your particular vehicle. It's normally just acouple of screws either plastic or regular that are accessed on the inside of the trunk by pulling the cloth planel that covers them to the side, after removing a big plastic screw, or plastic pin.
left side is on, and right side is off. what if the fuse is good, and the light bulb is good, and the socket is also good, what is left is wire right? You didn't explain much about it.
which light are you referring? The turn signal light would need separate left and right switch control, and other lights the left one and right one should both be on. So in your case, if the light you were referring to is the turn signal then first check the switch, for other lights according to my circuit diagram then you should chase the wires.
How about all lights work but when car is off one stays on???
yes, this video explained exactly this situation.
Hi,
I have the left brake light, not working in 2011 town and country, I checked it on the right side, and it's working , the fuses are OK. What other possibilities?
@@theinspired5367 you need to follow the process described in the video first. Did you at least swap the left bulb with the right bulb?
I change the fuse but still the light is on
If the light is OFF, then there is some possibility of fuse problem, but you have light ON, right? What about the switch? There are total 5 components, you need to eliminate one by one.
Genius Asian the switch and fuse where good the problem is the hook that goes inside the switch it’s broke but I found a permanent solution for it
@@gustavorodriguezvences7770 That is great news. Let us know your "permanent solution", sharing your solution will benefit other people. Thanks.
No lights on drivers rear side work. New bulbs new fuse battery fine. Other side works. I've cleaned connectors. 🤯
you still could swap left bulb with the right right light bulb to confirm that your new light bulb can fit the socket correctly. If that does not solve the problem. Use the volt-meter to compare the voltages from left and right side terminals to see if they are identical. If they are not identical, then keep tracing the wires.
amitabba.
You totally side stepped what to do if the bulb was good and left side still won’t light
As shown in the video, there are 5 components in the circuit: battery, fuse, switch , light bulb and wires. In terms of probability, the light bulk has the lowest lifespan. The battery, fuse, switch are not too hard to test, so you should test those. Since the light bulb from the right side is good and electricity reached the right side, then the final step should trace the wires' conductivity
Fuck my Explorer must be having wiring issues! Only third breaklight works, two corners don’t, changed fuses, relays, multi circuit, GEM, bulbs, switch, and still no poweee going back theee when break a engaged.
My Passengr side Brake light is working fine Divers side Brake Light is slow to come on and is dim
what kind of light bulb is the dim one? What would happen if you swap the left bulb with the right bulb?
@@GeniusAsian i have to take the Facia on the yaris boot to access the lights
@@davidoneill9442 since all the components are connected in series, all components can cause problems. In terms of probability, the light bulb has higher probability of failure, so check that first.
Waw
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I have a good one for you. Right rear lights work and left doesn't and left front work right front doesn't
Shame you didn't cover one light on, bulb, fuses and relay good
what did you mean by saying "you didn't cover one light on"? I did suggest to swap the two light bulbs, what is your result of the swapping?
@GeniusAsian the bulb was fine, relays fine, fuses fine but if I take one of the relays out, the headlight starts to work slowly but is half as bright as existing working one on other side
You forgot one thing that happens way too often, people put the bulb the wrong way in and then it's always on... Happened to a few people I know
Thank you for taking the time to share your experience, it may help many other viewers. I can understand that if I put the bulb the wrong way in, then it's always off (note: not always on) no matter how I turn the switch on or off, however what is the condition a wrong way may lead to always-on result? If I turn the switch on or off, the wire at the socket would be connected or disconnected, it does not matter how wrong you shorted the wires because the power source is off.
@@GeniusAsian I mean there are double contact bulbs for rear running lights/brake lights, theres two positions you can put them in, one is where its normally running lights on and when you press brakes it lights up more to indicate braking, the other position makes it so its always lighten up as if you are always braking.
@@svmei ok, that makes sense, thank you.
@@svmei 3qqe
I always new Asians were geniuses
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It was going well, ..I was ready to like and subscribe and then you lost me when you tested the light bulb with your multi meter and did not bother to explain the readings, what is normal, what is low, what is high, they we have no clue. How could you miss such a basic obvious thing? sorry... thumbs down from me.
Thank you for taking the time to provide feedback. There are many different types of bulbs, the traditional bulbs, halogen bulbs, LED bulbs, bulbs filled with xenon gas. They will have different meter reading if they are different types. Even for the same type they many have different reading. I would have listed different values if the title of the video were "different types of auto light bulbs."
My second point is: usually a video with detailed light bulb resistance reading see here: czcams.com/video/XSspTwABECo/video.html and also I have detailed different types of wiper blades here: czcams.com/video/yeTBwjer7Lo/video.html these two videos don't have many views. It may indicate most people just want to know the ideas but don't care much about details. It may also mean people may not click a longer video. Anyway, still I appreciate your input, and include more details in the future.
you sound like the type to ask for a manager at the store for a nice discount.
@@calamity333 In your local area you may be able to ask for a manager for a discount, but In US manager's main role is to resolve dispute not to change the prices. I used to be poor and felt ashamed, but now I make videos to help poor people, I don't look down on them.
@@GeniusAsian wasnt talking to you
@@calamity333 sorry, now I understand you were talking to the OP. Thank you for your support.