Terminal 15 Extension for Heated Steering Wheel DIY on BMW E90 M3 Ep.3 [ENG SUB]

Heated Steering wheel retrofit DIY on BMW E90 M3. Some add-on electric devices are turned on when the car key is switched to “ignition,” e.g. the dashboard camera and the heated steering wheel designed by BMW. There are fuse slots that have power only when the car is switched to ignition, and BMW sorted them as terminal 15. There is only one such fuse slot on Carl’s car and it’s already occupied by the dashboard camera. We are going to extend terminal 15 with electrical relays for the heated steering wheel retrofit.
**Tools and parts in this video**
Automotive relay - Sentlon 40A 12V 4P
Double leaf spring contact - BMW# 61 13 1 378 906
Crimp pliers - ENGINEER PAD-12 Handy Crimp Tool www.engineertools-jp.com/pad1...
Fleece tape - Tesa 51618 Fleece harness tape
**Chapter**
0:00 Opening
0:46 The plan
2:03 Relay parts
2:50 Space behind fusebox
3:12 Relay connection
5:10 Mock-up
6:22 Wiring for device power.
6:37 Fitting in the relays
8:00 Relays grounding connection
9:10 Grounding at the passenger's footwell
12:05 Restore passenger side carpet
13:07 Taking power for the devices
15:18 Wiring harness protection
17:43 Summary
Edit/Music: Christy Hsu
**Heated Steering Wheel DIY on BMW E90 M3**
Ep. 1 - Electric Terminals & DIY Power Indicator
- • BMW Terminal 15, 30, 3...
Ep. 2 - How to add a fuse
- • How to Add Fuse for BM...
Ep. 3 - Terminal 15 Extension with Electrical Relays
- • Terminal 15 Extension ...
Ep. 4 - Full walkthrough
- • Heated Steering Wheel ...
**About FCGP**
This channel was established by Carl, a DIY lover in Taiwan. It’s purely out of interest. No due date for creation.
CZcams: / @funcarsgoodpeople
Instagram: / fcgp2019

[@user-oz8kc1cf6q]

Hi,版主您好，非常喜愛你所製作的影片，過程非常詳細及解說，拍攝影片的細膩度讓想diy的朋友能夠明白其中的道理！而且對於電系複雜的理論能在你的簡單說明之中，獲取清𥇦的原理！謝謝你，另外可否把我遇到的其他問題，提問給你，幫忙解惑，感謝你的無私分享，也祝福一切順心如意❤❤❤

[@funcarsgoodpeople]

嗨！明觀您好！謝謝您的留言！歡迎你把問題貼在這裡唷（可以幫助頻道衝人氣 XD）我也會在這裡回覆的，也可以幫忙查BMW原廠線路圖或者功能說明，很多網友也是這樣唷～

[@babyztfctmbh4155]

It's a 2003 745li bmw

[@babyztfctmbh4155]

Question I am trying to retrofit the back seat to reclaim back seat and the back center console also I need help with the retrofit if you can help me I appreciate it so much

[@MrFryfish]

Have you protected the circuit that is feeding the heated steering with one fuse and another fuse for the circuit that is feeding/supplying the dashboard camera? Of course I mean the circuit via the contacts. Any short-circuit via contacts (unprotected) can be a fire hazard because the electrical stress createsd by the short-circuit can melt the cable insolation due to the heat, and from here fire..

[@funcarsgoodpeople]

Hello SD, yes I have used independent fuses for all the added-on devices, e.g. fuse F22 for the dashcam, fuse F24 for the heated steering wheel. The power source comes from a fuse and is controlled by the electrical relays I used in the video. Thank for the reminder!
I do agree I should have made the extension of terminal 15 more simple to avoid unexpected short circuits...

[@benkr5870]

Hello ,is that the original terminal 15 behind the fusebox ?
i have a problem ,if i press on my start button for ignition on ,then it goes on but after 1second iginition falls out ! So i have to push again on the start button to put the ignition on.
Bmw e90 lci

[@funcarsgoodpeople]

Hello Ben first of all I strongly recommend you to read the fault codes with diagnostic tool such as OBD2 scanner. The fault codes are super helpful in troubleshooting.
I guess you can start the car and keep it running without other problems. if so, I think there’s nothing wrong with terminal 15.
I feel like the ignition/terminal 15 is turned off by other modules. For example, the power management system will regulate the availability of electricity when it thinks the battery is low. If you had replaced a new battery. Please register the battery to tell the car about full battery so previous problems won’t be stored in the memory and thus hindering normal operations.
But like I said, the fault codes are going to tell us about the car in great detail. Let’s find it out!

[@funcarsgoodpeople]

(Please see my updated reply)

[@benkr5870]

⁠@@funcarsgoodpeople hi ,I read the fault codes but not with ista.With Some basic obd2 scanner.But no faults on that.
The problem is ,I put the key in and then i press the start button for ignition to go on ,so normally all the lights on dashboard go on ,but sometimes it Goes on but immediately it falls back out ! Then i have to press again and it stays on.Not a big deal but Imagine one day it Will not go on anymore !
So I was thinking that maybe there is a relay that is not always working…you say the relay or terminal 15 relay is integrated in the fusebox ..so then if you want to change that ,you need to change the whole fusebox ?

[@benkr5870]

And if you change the fusebox …can you take one from the gravejard ? From the same engine and type car ,and put your fuses in that fusebox or do you need one from the dealer with your vin number ?

[@benkr5870]

@@funcarsgoodpeople is it only that what can turn the ignition /terminal 15 off ? Can you give another examples what can turn the ignition/terminal 15 off ?