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-   -   2001 M5 Airbag troubles- Can't reset light (http://www.bimmerfest.com/forums/showthread.php?t=677049)

cynsatim 02-18-2013 10:02 AM

2001 M5 Airbag troubles- Can't reset light
 
3 Attachment(s)
Hello all. I'm about to sell the beast, and I have an airbag light on that I'd like to take care of before I send her off. Here's a little background on the issues I've had: Airbag light has been on for some time. There was no communication from the module to the OBD2 connector. After much troubleshooting and wire hunting, I found there was a broken connection between the instrument cluster and the OBD2 connector. I repaired that and now have communication with the module via INPA. I consistently get 6 errors. I reset them using INPA, but they immediately return. Here they are:

E R R O R M E M O R Y R E P O R T -------------------------------------
Date: 02/18/13 09:05:49 ECU: MRS3 JobStatus: OKAY Variant: MRS3-------------------------------------------------------------
RESULT: 6 errors in error memory !-------------------------------------------------------------
13 ignition circuit ZK12 -> airbag driver stage 2
Error frequency : 1
error active at the moment resistor too small error is not sporadic-------------------------------------------------------------
12 ignition circuit ZK11 -> airbag passenger stage 2
Error frequency : 1
error active at the moment resistor too large error is not sporadic-------------------------------------------------------------
11 ignition circuit ZK10 -> battery unplug 1
Error frequency : 1
error active at the moment resistor too large error is not sporadic-------------------------------------------------------------
4 ignition circuit ZK3 -> airbag passenger
Error frequency : 1
error active at the moment resistor too large error is not sporadic-------------------------------------------------------------
2 ignition circuit ZK1 -> belt tensioner driver
Error frequency : 1
error active at the moment resistor too large error is not sporadic-------------------------------------------------------------
1 ignition circuit ZK0 -> airbag driver
Error frequency : 1
error active at the moment resistor too small error is not sporadic

================================================== ===========


I've searched and searched and searched and can't find much info on these specific error codes. Before I start tearing the car apart to start trying to figure out what's wrong, or give up and go straight to the stealer to figure it out, I figured I'd ask you all and see if you had any ideas. The car is a 2001 M5, stock. I have a spare airbag module that I coded to the car using NCS expert and it gives the same codes, so it seems to be something with the car and not the module. Any help is much appreciated!

In an effort to provide as much info as possible, I've attached three screenshots of what I see in INPA for the module.

cynsatim 02-19-2013 07:05 PM

To help anybody out that may have these problems in the future:

Passenger airbag showed resistor too large. I had no idea how easy it was to pop the passenger airbag cover off. Found that the connector had been disconnected. Turns out the previous owner was a bag of crap and had disconnected it. Great guy apparently. Reconnected the connector, reset the light, and I'm now down to four codes!

Pulled out the driver's airbag and found that the connectors that plug in to the airbag were damaged. I fenagled one to work as a test and reset the light. Now only three errors! I will order the new harness and expect this one to be resolved.

So in my case, resistor too large indicated an airbag not plugged in. Resistor too small indicated a damaged connector at the steering wheel. The airbag itself has a spring in the connector that shorts to the pin, and I think when the cable is damaged in allows the spring to contact the pin, creating a very low resistance circuit.

Next step is to look at the seat belt tensioner. Resistor too large = it's disconnected? We shall see.

I'm still at a loss for the battery unplug fault. I'll look more in to this one in the next few days and post my findings.

Topaz540i 02-19-2013 07:12 PM

?has your car ever been crashed?


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