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Old 10-25-2019, 03:18 PM   #1
Shive
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2002 L-Series 2.2L Wagon
2003 L-Series 2.2L Wagon
Default 2002 LW200 Air Bag Light plus other issues

2002 LW200 Saturn - 85,000 miles actual
I have several issues.
The airbag warning light on the dash is on but the service light has gone out.
I had it checked at AutoZone for codes and there were none.
I had a previous post about starting issues which are still occurring at times.
The batteries new the alternator is putting out fine it just will not start times.
When I leave the car and the doors will not lock I know the car will not start.
It happens that way every time. The FOB is okay. If I disconnect the positive battery terminal for 10 seconds and replace it every thing works OK. This only happens about once a month or so but now the airbag light has come on. The car is on its third BCM. The new one was replaced under a recall. I replaced that second BCM with a used one. (Which put 128,000 on my car) I am aware of how that works. I am now wondering if the BCM is causing these problems.
The automatic headlights do not work. I replaced the turn signal multi function switch which solve the problem once before but it did not solve the problem this time. BCM ??????
Other than the above problems the car runs great.
Any suggestions would be appreciated.
Shive

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Old 10-25-2019, 07:23 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 2002 LW200 Air Bag Light plus other issues

The supplemental diagnostic module (SDM) monitors airbag sensors, cycles the airbag light, performs its own power on self tests and determines if a fault occurs to log an error code. When the airbag light turns on and stays on, the sdm turned it on and stores the error code either in the bcm or itself. Airbag error codes can't be read by generic readers. Airbag error codes are prefixed with a 'B'. AutoZone, presently, read generic and abs error codes. Emissions error codes are prefixed with a 'P', abs error codes prefixed with a 'C'. Other error codes are prefixed as 'B' or 'U'. Each letter followed with four numbers. B, C, and U codes are manufacturer specific and require a dedicated reader ($$$...).

The airbag light remaining on means the airbag system is disabled (no automatic airbag deployment). The abs light remaining on means the same, no abs operation in emergency braking situations. Each module is completely separate from the engine and body control module. The bcm is the gateway for all error messages from each module and does not affect the airbag or abs modules.

To decode airbag error codes requires a better reader repair shops use or GMs Tech II scantool. There's always aftermarket readers to choose from but they're not likely cheap and are setup for specific vehicles (Ford, GM, Dodge, Land Rover, etc).

I have a generic reader, OBD wiz and it cannot decode errors from the wrench light, abs and airbag. I'm now 'interviewing' a reader ($110) allowing me more access to all modules to read and test all sensors, find history codes, program replacement remotes, find software, firmware notes, and more. Since its manufacturer specific, it covers most GM models. If I drove a Ford, I'd have to buy a Ford designated reader to have access to Ford specific error codes (unrelated to emissions as they're universal). In one sense, a generic reader for everyday use for virtually every USA vehicle since 1996 and a second reader for each manufacturer for access to each manufacturers modules (abs, airbag, ecm, bcm, tcm, etc).

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Old 10-26-2019, 11:51 AM   #3
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2002 L-Series 2.2L Wagon
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Default Re: 2002 LW200 Air Bag Light plus other issues

Thanks for the information it is appreciated.
My ABS does not seem to be affected - there is no warning light lit.
Well, I suppose I'm headed to a GM dealer for a check. This might cost more to repair than the cars worth. We shall see.
Thanks again

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Old 10-26-2019, 03:55 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: 2002 LW200 Air Bag Light plus other issues

The abs indicator is warning light. When it cycles on then off, the abs performs its own self tests and if everything within itself is fine, turns off the indicator and stands by. If a sensor, wire, toothed wheel or module fails for any reason, it turns on the abs indicator and remains on. Abs is disabled with the abs light ON. No reset possible, a hard error that should be brought in to GM, brake repair shop or anyone familiar with abs issues to determine where the fault lies.

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