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alexgraf
Joined: 17 May 2002 Posts: 319 Location: Michigan, USA
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Posted: Sun Apr 04, 2010 10:48 am Post subject: Seat belt light on |
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Hi:
The seat belt light of my E39 stays on when the seat belt is latched. It started intermittently (latching and unlatching the drivers side belt did the trick) but now it always on. The short side (attached to the seat) has an electrical cable that I supposed sends a signal when the seat belt is on or off. Is it there any way to test if this sensor is working, before I go through the trouble of removing the seat. The seat is a comfort electric.
Thanks ...
Alex _________________
'95 325is
'99 528iT - a real SUV |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Mon Apr 05, 2010 11:22 am Post subject: |
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I wouldn't exactly say it would be easy, but the dealer can diagnose the switch using their DIS/MoDIC system, via the SRS bus.
Otherwise, if you DIY, you'll need to pull the buckle and examine the connections inside. The SI excerpt mentioned "Defective printed circuit board or contacts of the seat buckle switch, are causing resistance values to fluctuate under mechanical load."
You might try a blast of compressed air into the buckle slot in case there's some debris in there. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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alexgraf
Joined: 17 May 2002 Posts: 319 Location: Michigan, USA
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Posted: Thu Apr 08, 2010 6:57 pm Post subject: |
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Thanks Ed Jack. I took the car to my good mechanic to read the codes, and to change the PCV valve. I realized that was going to take most of a good weekend to do that job. I will update the forum after I get the car back. _________________
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'99 528iT - a real SUV |
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alexgraf
Joined: 17 May 2002 Posts: 319 Location: Michigan, USA
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Posted: Fri May 28, 2010 6:11 pm Post subject: |
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The mechanic changed the seat belt buckle and now the seat belt light never lights up, even with the seat belt not engaged. Is it there any "setting" to allow the light to come on? I have had no time to return the car to the shop yet. _________________
'95 325is
'99 528iT - a real SUV |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Fri May 28, 2010 7:19 pm Post subject: |
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Sounds like an imcomplete repair. Back to the mechanic.
The car is supposed to nag you until you buckle up. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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alexgraf
Joined: 17 May 2002 Posts: 319 Location: Michigan, USA
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Posted: Fri May 28, 2010 7:44 pm Post subject: |
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I figured. Will try next week. Thanks !!! _________________
'95 325is
'99 528iT - a real SUV |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Fri Oct 29, 2010 11:27 am Post subject: |
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Pin 4 of the seat belt connector is supplied with 12V. Pin 3 sends a signal to the SRS control module, which I would expect to be 12V.
Bentley shows a transistor in the buckle, but I suspect it's a microswitch.
Just for fun, try a blast of compressed air into the slot where the tang goes. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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