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2001 Z3 Roadster SRS light comes on and off

2824 Views 8 Replies 3 Participants Last post by  ronnie38
I have rare problem with my 2001 Z3, the airbag light comes on and goes off after leaving vehicle for a couple of hours, and comes on after a drive on restart.

I had my friend hook it up to Snap On Modis scanner while the light was on, there was no communication.

I let the vehicle set overnight and the ligth was off, took it to him again and the scanner had communication, but; no codes.

Drove the car for few miles and restarted the vehicle after get gas, Light ON again and scanner conneted no communication.

disconnected airbag harness in 3 different places, both seats (under) and also under dash and reconnected. Same problem.

Anyone can help here.

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I am going to get a can of it now from Radio shack around the corner. I hope this would do it.
Also, don't move your seat full forward or full back, leave a mm or two to put less stress on the wires/connectors.

Let us know if it works for you.

I did buy the DeOxit and cleaned/treated the connectors, I still have the same issue, the light goes out when vehicle is parked for like an hour and stays off during driving (longer than 2 hours), when I turn the key to off and restart the vehicle the light comes and stays on untill I stop for another hour or so, when the light is off there is no codes and the communication is good, but; when the light comes on (i tried not buckling my seat belt same thing) then there is no communication and the light stays on.

I cleaned and treated under the seats connectors and the main module connector.

Any Idea where to start from here.

I just tried this, turned vehicle off when the Airbag light was on for 20 minutes. Restarted and the light was off, idled vehicle for 30 minutes. Turned engine off and restarted, light is on. I did not even move the seat or sat. Just idling. Let the vehicle for another 20 minutes started and the light is off, turned off and turned on again.

I still get communication with module when light is off, and no communication when light is on.

Do you think I have a bad module?

I'm not familiar with the Snap-on scanner, does it use OBDII or the connector under the hood? Does it read SRS codes? I ask because with the Peake tool, there is an entirely separate tool for SRS. If anyone near you has a Peake SRS code reader, borrow it.

No codes with light off or on? That sounds like maybe a bad connection somewhere. Possibly shorting, possibly bad ground. Tough to say without codes.

The Snap on scanner connects to either location, you can connected directly to the round under hood connector or in the dash (right side) with a special key to it.

The scanner is top of the line pro series, it does read codes from SRS, but; when the light comes on there is no communication, I will look for ground connectors.

SRS failures

But a peak SRS reset tool.
find the failure point.
Remove that seat Clean or replace the connectors on the seat sensor, and Seat belt sensor.
Reset the SRS.
And all is well.

:angel:Replace the connectors with a waterproof type. No more corrosion.
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