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Prefuse Box Removal and fuse replacement Mercedes Benz C250/W204
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- čas přidán 19. 07. 2018
- As some have said, do not rip the yellow pyrofuse out of the box. Pry the orange part up first, and then it will remove easily.
If you’ve burnt out one of your fuses in your prefuse box the dealership will try to sell you the entire prefuse box which will probably be around $200 to $400 including installations. I’ll show you how to open it and replace the burnt out fuse.
Mine burnt out because I was installing a subwoofer amp and mislabeled my ground and power wire, and had an inline fuse at 100w which was too much for the 80w fuse I had it hooked up to, and blew the prefuse box fuse instead. I figured out the problem because the entire back / rear of the car was dead due to the rear fuse box receiving no power. The car didn’t start because the fuel pump wasn’t receiving power.
Before you do this, make sure that you test every possible fuse and connections to make 100% sure that the prefuse box IS the problem because it’d be a huge waste of time to go through all this and for your battery to be bad or something stupid like that.
If this doesn’t work or you screw up your car worse it’s not my fault. This worked for me.
Link to fuses: a.co/4GsAd1p
Name of fuses in case amazon link goes down: Blue Sea Systems AMI/ MIDI Fuses
When disconnect plug from the pyrofuse you must lift the orange safety portion of the plug, don't use pliers and force !
Rob Bob thanks for the info, I tried for like 20 minutes to remove it.
I wish I would’ve read this prior to me using pliers...mine will not fit back in. I have ordered a new yellow squib connector at the cost of $70. It’s a simple easy connector to push up and remove. A panel remover tool is the best tool to pry it up and off. Please edit this video. Hard way for people to learn. Everything else was helpful though.
chrometwourdome1 it’s in the description and pinned top comment, can’t really edit a video.
How do you lift it ?
Interesting video, thanks! For others: This is the pre-fuse box F32 (Vorsicherungsdose). It also contains a relay that, when faulty, can cause all kind of weird fault messages when turning power on in the car. Fault code B214B72 / A14B72 can be a hint for this.
mnemo70
Yeah, no one had a video for opening this up, and a lot of people on forums wouldn’t touch it because it’s non-serviceable. It’s really just a few fuses and relays, nothing crazy about it, no need to be afraid of it.
Yea my relay is faulty can it be replaced alone or the whole F32 box has to be replaced?
Thanks GINCO ! I was wondering why my C240 had power at the PreFuse box but most of my fuses in the other boxes aren't receiving power. I suspected a high powered starter fuse or Starter relay. I will once again check my fuses then test all my relays then I will check the PreFuse box. Once again thanks, your video was definitely needed for the Mercedes owners.
Jerry Mont
No problem, glad I could help.
How do you test the relays?
@@ginco_bnzHi there from South Africa. Will anything go wrong if swap around the two wires on top that are fastened with the 10mm spanner?
@@ginco_bnznot sure which one goes where after removing them
DO NOT REMOVE THE YELLOW CONNECTOR AS SHOWN!!! Pry the top part off and it will come off easy!
yeah, its the pinned comment.
Pry it of using what ?
Thank you
I have a question I have a CL500 2003 Mercedes I'm trying to find out what powers pin 30 on the starter relay what wires that's going to the fuse box under the seat
I hope you see this video, how exactly do you test fuses while this box is still installed in the engine bay? You mention this at 5:04 that you figured out already which fuse was blown while in the car. Thanks
Use a continuity tester and test from a the battery positive to the screw terminals on the side of the fuse box where the wires plug in to.
What is wiring for sam power module?
I think this is a crappy design by MB. I had the airmatic compressor fail, and it blew a fuse in the prefuse box at the same time. Instead of having a normal fuse in the power supply it just doubled the price of the repair.
Thank you for the video Ginco. Now i will repair the old box and have as a spare.
I agree, it is a pretty dumb design. The chances of the car having a major fault that would blow one of these without blowing other fuses is very low, and the fact that it’s supposed to be irreplaceable is dumb as well.
Hi mate ,I have similar problem with my w212. My compressor stop working when my battery was flat. I tested with star diagnosis and I have two fault codes . Valve on compressor could be a issue , and 2nd fault is level pressure air valve between air struts. I can hear sound from compressor when is tested by star diagnosis. Do you remember what was symptoms in your car? Can you help?
@@charlitolson7316 On mine the compressor had locked up an drawn too much current resulting in a blown fuse. There is an air filter on the compressor air intake that is often neglected. this can cause the compressor to draw dirty air and wear out prematurely. Also the intake hose can crack and give the same result..
@@Norseman220 thank you for your answer mate. I’m still fighting lol
Thanks for sharing your knowledge! Please I have a problem with my Mercedes w204 2009 320 4matic. After going through water flood, the AC stop blowing cold and compressor wont start, when I check the compressor it work manually and ac blowing cold. All fuse are good, do you think my problem maybe in the Prefuse Box? Many thanks.
I don’t do HVAC so I have no idea.
Simply use a ODB2 SCANNER to figure what DTC are active.
Without a scanner you can't guess anything.
Very easy to get
I'm not getting no power I blew a fuse the starter relay I know it's probably a short somewhere but I cannot figure it out I cannot power my seats up to move them out to get the carpet up to get to the back fuse and the wires under the carpet
Try changing fuse 59. Worked for me. Also make sure your pyrofuse on the battery terminal is not blown.
Where do you find the grouped fuses?
Actually I'm a rewire and I'm going interesting in this lecture so I will like to know if there is type use to lecture people just for me to be inform anytime of lecture so can be a partaker. Thank you
Where is the location of pyrofuse on ML500?
On a w203 can the prefuse cause the engine fan not to work I’m getting 14volts with the car on everyone but the power wire to the cooling fan and there’s a coolant visit workshop on the dash and a p2073 fan code on my mb scanner and I put 2 fans in it
Did you ever find an answer. I have this exact issue. I can’t get my AC to turn on and I’ve noticed the fan no longer blows
I'm having some issues with a constant 12v after replacing my OEM stereo. It seems that the terminal that is closed to the windshield drops to around 1.5 volts a few minutes after the ignition is switched off and this causes my stereo memory to be erased. Most of the power, including lights, and seats are pretty much gone after this happens. The power resumes after opening the door or unlocking/locking the car though. When the voltage drops/rises, I hear a small pop or click just behind the battery. Seems like some thing is switching off after some time of the ignition going off. I'm not sure if this is normal or if the prefuse is bad. Could anyone check on their car to see if this is normal?
It’s normal. You need to find a proper constant 12v, yours is most likely wired to the cigarette lighter which is only on when the car is on. Find one that is constant or wire directly to the battery.
I have a e350 coupe base model 2 door trying to replace the pre fuse box. Any help would be greatly appreciated
Lol what help am I supposed to give? If this video isnt good enough you need to take it to a shop, if you're inexperienced you will damage the car more.
I know this video was a few years ago. Do you have part numbers for all the fuses in side the Pre Fuse Box? Really need the information on the 7 terminal orange fuse and the 3 blade orange fuses that are connected to it?
At that point just buy a new prefuse box.
How do you know about the problem its there..have problem c250 2013 the cluster
If the car doesn’t start and all of your fuses are working. Check the posts on the top of the prefuse box with a multimeter to see if they’re actually working.
Hi. I just checked as you suggested in the video. There is no beep with either terminal. the car runs normally. All systems go. All 3 points show battery voltage. I assume you check it while a key is not on contact? I still have "Fault code: A19116 Fault: The power supply of circuit 30g is outside the valid range. The limit value for electrical voltage has not been attained, Fault code: A10C16 Fault: The power supply is outside the valid range. The limit value for electrical voltage has not been attained." and some others. No check engine or other codes. What does that mean?
I don't know, I'd recommend taking it to a shop.
This is a very good video. I helps me a lot to understand why there is no power supply to a lot of my devices in my 2013 Mercedes GLK250 after jump start. I suspect I have some fuse blown in the prefuse box. I don't quite understand why it suppose to have continuity between ground contact and the other contacts. In between, there suppose to have a battery, isn't it? Or, do you mean check continuity when the vehicle is turned on?
I don't understand the instructions at the beginning. Shouldn't the voltage at the fuse box be 12V? So how can you do a continuity test between HOT 12Vs and battery negative? Wouldn't that result in a short circuit?
You are correct, I should have said to disconnect the positive wire and test by connecting the multimeter to the positive battery clamp. However, I think it’s pretty obvious you should completely disconnect, even remove the battery before doing anything involving fuses.
@@ginco_bnz yeah i was thinking the same thing and i did what he said now i shorted my car i wish he wouldnt post stuff that is wrong
Hi Ginco, what is the yellow plug for? I need to know asap please!
Some sort of sensor. Don’t know what it is.
it is a "piro fuse" in case of accident the computer can decide to cut-off all power.
great video , do you know if there is a fuse for the alternator , thanks
check the fuse diagrams
Hello mate i would like to ask if thats instruction make sort out a error code of b2735-13,the squib for pyrofuse on board electrical network line has a malfunction.I really mad for this i couldnt erase it from memory.Many thanks
Hi brother, did u fix the error code? B273513, if u did please tell me how as I have the same code
@@aameral-ghazali2495 Hello.Yes I sort out a problem you have to buy resistor 1.6ohms and solder it to cable who is going to pyrofuse on (plus battery clamp),first you have dissconnect a battery.thats the way to sort it.Cheapest and more solid way.Problem is in that plug black yelow orange blue color.Some of connection is loosing when is a vibration from engine or different sources
@@lukaszklimczuk where did you solder the resistor exactly? And where the black yellow orange plug where the problem is?
@@aameral-ghazali2495 plug from pyrofuse and ends solder to each ending.
@@lukaszklimczuk can you show me a photo please
why after I installed mine it says srs service required?
Check the orange plug on top
after replaceing the fuse do you need to program it to make it start?
no
I have a 2004 W211 E270 CDI auto and am looking for the front pre-fuse arrangement. Looked on the side of instrument panel and under footwell of passenger. Not what I am after. Am after the seriously rated fuses.The official Haynes manual is pathetic.
Please help. Pierre.
Hi ginco thanks for the video. But please help me. My W204 2010 I have low voltage next to nothing on the lower right side fuses most are 7.5amp those are powered by the red and white cable. And that cable has no power. I opened the prefuse all fuses are gud but I don't get current as from the beginning of the cable please advise me what must be wrong There
If you aren’t getting voltage from the beginning of the cable the cable is probably bad
Is the pre fuse the pyro fuse ??
No
Good afternoon, I have a mercedes c300 2009, it did not want to start again, I have the high-beam light on, the srs light, the front and interior light does not turn on, the panel light turns on, it does not make a clip when trying to start it, some solution
Hi do you find the problem?
I have the same rights now.
Hello. It's solved ? Thx
Very useful, thanks. Please take this constructively - you don't need a silly repeating music loop.
Yeah lmao looking back I realize I should have left no music
Ginco very helpful video! So the three studs has to have continuity with battery negatibe point?
@@johnchow2702 yes. If they dont have continuity a fuse is most likely blown.
honestly i disagree . but to each their own :)
Just accept this for what it is...........
Good info, But would be nice if u actually stoped cutting off the video and show us exactly how u remove panels 👍
If you can't figure out the in between you shouldn't be messing with the electrical system of a Mercedes.
@@ginco_bnz I got it apart but man it was a hassle!💀, ur video did help a lot👌
Are you Harry's little brother
GREENY4289 Yt what? Who’s harry
@@ginco_bnz your brother bro