318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Electrical


Electrical All wiring questions.

» Recent Threads
Biolite's Build
05-11-2022 02:28 AM
Last post by J!m
Today 03:08 AM
6 Replies, 1,161 Views
Danny's 318ti Thread...
05-03-2022 07:13 PM
Last post by Biolite
Today 12:09 AM
7 Replies, 592 Views
wanted S52B32 us spec...
12-24-2015 02:18 PM
Last post by Biolite
Today 12:08 AM
2 Replies, 10,567 Views
WTB: M trim, rear
09-19-2018 08:35 AM
Last post by richardlennon72
Yesterday 06:33 PM
1 Replies, 5,313 Views
First BMW
05-13-2022 06:24 PM
Last post by J!m
05-18-2022 11:49 AM
2 Replies, 583 Views
1995 BMW 318ti for sale
04-29-2022 05:46 PM
Last post by baby_bimmer
05-14-2022 09:06 PM
6 Replies, 1,892 Views
Reply Share/Bookmark
Thread Tools Display Modes
Old 09-30-2021, 02:03 PM   #1
Junior Member
Join Date: Aug 2021
Location: Australia
Posts: 7
iTrader: (0)
Default Pretensioner / SRS / Airbag light question

Hi all

I picked up a very rough '96 recently and am slowly working through a long list of things to get it registered and back on the road. Currently trying to fix a constant airbag light.

There is no sign of any wiring or connectors going to the pretensioners. The passenger side has the occupancy sensor, but there is no sign of any wiring to or from the pretensioners on either front seat - either from the pretensioners themselves or from the harness. I removed the driver's seat and didn't have to disconnect anything. With the seat out, there was no sign of any harness wiring coming through the floor carpet. (There is harness wiring through the carpet on the passenger side for the occupancy sensor, but nothing else).

Any ideas??

bcp is offline   Reply With Quote
Old 10-05-2021, 10:19 PM   #2
Senior Member
Join Date: May 2013
Location: Seattle
Posts: 508
iTrader: (0)

I had similar thing. turned out to be that one of the wires on the slipring had broken.

Not sure if slipring is the right term. But the deal that is on the back of the steering wheel that connects the shaft to the wheel. the airbag wires pass through there. If those are broken they can activate the SRS light.
BRADESTAR is offline   Reply With Quote
Old 10-06-2021, 04:20 PM   #3
Junior Member
Join Date: Aug 2021
Location: Australia
Posts: 7
iTrader: (0)

Does anyone know if the pre-97 mechanical pretensioners / receptacles connect to the ECU in any way?
bcp is offline   Reply With Quote
Old 10-07-2021, 09:21 PM   #4
ti tinkerer
Junior Member
Join Date: Aug 2015
Location: London
Posts: 9
iTrader: (0)

When the SRS light came on for me it was the passenger occupancy sensor mat. The light came on as soon as my mate JUMPED into the car with his boney backside :-( One way to diagnose this is to test resistance at the connector for the mat under the passenger seat.

The fix is to take the seat apart and change the mat while having fun with all the hog rings, though there are plug in modules available that simulate the resistance so the light can be reset. Or you could take out the instrument cluster and remove the bulb before realising that there is a backup light and then just put black electrical tape in there, not that I would ever do a thing like that just to get through the MOT test :-0

I have no idea about the tensioners. Best of luck with this and all the other work you're doing on it.
ti tinkerer is offline   Reply With Quote
Old 10-08-2021, 01:58 AM   #5
Junior Member
Join Date: Aug 2021
Location: Australia
Posts: 7
iTrader: (0)

Thanks folks.

I am across and have sorted the cluster warning bulbs, airbag modules, clockspring and occupancy sensor. I’m now on to the seat belts and trying to ascertain which spec I have in my car (10/96 build) and whether these can trigger an SRS fault / warning light.

As above there is no wiring to the seat belt receptacles in my car. Does this mean:

(a) they are mechanical pretensioners that operate solely from the cable being pulled by seat movement on impact and the seat belt receptacles don’t have latching switches (ie neither the pretensioners or receptacles are connected to or send signals to the ECU, therefore they can’t be causing an SRS fault); or

(b) my pretensioners / receptacles / car wiring have been butchered.

I have an SRS code reader on the way but am trying to make some progress ahead of long COVID delivery times…

bcp is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY: Seat Belt Buckle Switch - Trick the Airbag Light CirrusSR22 Knowledge Base 13 07-31-2017 05:41 PM
Airbag SRS light time stamp? 318pilot Interior and ICE 1 01-29-2010 04:28 PM
SRS Light on sfj642 Electrical 3 09-14-2007 09:29 AM
SRS Indicator Light *Popped* h0bbez Interior and ICE 6 01-24-2006 03:49 AM
Reoccurring Airbag light lankyguy Electrical 2 10-28-2005 07:13 AM

All times are GMT +1. The time now is 03:10 AM.

Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2022, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 76.11 k/88.82 k (14.32%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.