318ti.org forum

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


Electrical All wiring questions.

» Recent Threads
WTB: S50/S52 swapped or...
08-29-2021 05:22 PM
Last post by 98332
01-21-2022 03:23 PM
9 Replies, 7,569 Views
Central wood panel
08-22-2021 08:49 PM
Last post by andre3
01-20-2022 12:06 AM
2 Replies, 3,526 Views
95 318ti 5-Spd w/factory...
10-15-2021 08:22 PM
Last post by Mongwit
01-15-2022 08:05 PM
10 Replies, 9,351 Views
Reply Share/Bookmark
Thread Tools Display Modes
Old 09-30-2021, 03:03 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, 11:19 PM   #2
Senior Member
Join Date: May 2013
Location: Seattle
Posts: 506
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, 05:20 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, 10:21 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, 02:58 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 06:41 PM
Airbag SRS light time stamp? 318pilot Interior and ICE 1 01-29-2010 05:28 PM
SRS Light on sfj642 Electrical 3 09-14-2007 10:29 AM
SRS Indicator Light *Popped* h0bbez Interior and ICE 6 01-24-2006 04:49 AM
Reoccurring Airbag light lankyguy Electrical 2 10-28-2005 08:13 AM

All times are GMT +1. The time now is 06:41 PM.

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: 72.59 k/84.83 k (14.43%)]

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