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BCM, Security light blinks, car won't start
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achieva
Novice
Feb 7, 2008, 1:17 PM
Post #1 of 8
(6542 views)
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BCM, Security light blinks, car won't start
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Have a 1997 Oldsmobile Achieva (2.4 litre) with 61,000 miles. The motor had a knocking rod so I had the engine changed. Now the security system won't let the car start and idle, it starts but then dies immediately. Security light is blinking when ignition is on. Mechanic says it could be the key or body control module. Car never did this before engine swap and began immediately after swap. No electronics were changed. It does this with both keys, so I find it hard to believe it is the keys. The only issue before swap was the battery would not hold a charge and not yet been changed. Any suggestions or diagnosis is appreciated.
(This post was edited by achieva on Feb 8, 2008, 7:54 AM)
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Double J
Veteran
/ Moderator
Feb 7, 2008, 2:31 PM
Post #2 of 8
(6524 views)
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Re: Body Control Module
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Sounds like the system is in long term tamper mode...
Try the reprogramming auto learn procedure...
1) Ensure battery is fully charged.
2) use a scan tool to clear the DTC's (diagnostic trouble codes)
3) Turn the ignition switch from the off position to full crank position attempting to start the vehicle. the vehicle will start then stall.
4) Leave the ignition switch on while observing the security indicator
5) When the security indicator turns off,(can take up to 10 minutes) turn ignition switch off...wait 10 seconds..
6) The BCM and the PCM will learn new code on the next start attempt.
The PASSLOCK TM System is designed to prevent vehicle operation if the mechanical key is not used to start the vehicle. The mechanical key, in normal operation, will turn the PASSLOCK TM Lock Cylinder. The PASSLOCK TM Lock Cylinder will relay a Resistance Code (R-Code) to the Instrument Panel Cluster (IPC) . The IPC will determine the validity of the R-Code within a preset time window started form an Ignition Switch input and will send a coded password to the Powertrain Control Module (PCM) . When the PCM receives the correct code, it will allow the Fuel Injectors to operate normally.
Try this and post back results.....hope it helps....
(This post was edited by JIM N on Feb 9, 2008, 1:16 PM)
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achieva
Novice
Feb 7, 2008, 5:04 PM
Post #3 of 8
(6518 views)
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Re: Body Control Module
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I put in a brand new battery and reset. So far, so good. I have 2 keys that both worked prior to engine swap. When I reprogrammed the BCM with the first key, it worked and started twice. When I tried the 2nd key it messed up again, so I went back to key #1 and was able to reset it once again and it started. I am going to stick to 1 key and see what happens over time. Thanks for your help, and if you have an idea why 1 key works better than the other, or if this is s recognizable sympton for another problem, please let me know.
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achieva
Novice
Feb 8, 2008, 7:51 AM
Post #4 of 8
(6515 views)
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Re: Body Control Module
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Okay, it is not working again. Each time I reset the key (it takes 2 or 3 tries) the car runs great. After turning it off we have to repeat the same process. It starts, dies, and security light blinks. The car started every time before the engine swap, either key. This started immediately after the swap at the mechanics garage. There has to be something not hooked up right. I find it hard to believe that either the BCM or both keys went bad during the period of changing the motor.
The check engine light is on with the ETS (electronic traction system). This was happening before the engine swap but never prevented the car from starting, and the warning lights would come and go, as they are still doing now. We must be overlooking something.
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Double J
Veteran
/ Moderator
Feb 8, 2008, 11:58 AM
Post #5 of 8
(6508 views)
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Re: Body Control Module
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Have the trouble codes read and post back....lets see whats happening...
codes need to be read by a good quality scan tool than will read the security system codes...
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achieva
Novice
Feb 28, 2008, 11:46 AM
Post #6 of 8
(6428 views)
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Re: Body Control Module
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I had the codes read and by Chevrolet and they said it was the ignition switch. So I had it changed. Several hundred dollars later, it hasn't fixed a thing. It has to be that the computer is not reading the new motor somehow. Is that possible? Does the BCM need to be programmed to the VIN of the donor car now that the motor is changed?
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Double J
Veteran
/ Moderator
Feb 29, 2008, 1:16 PM
Post #7 of 8
(6421 views)
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Re: Body Control Module
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Never heard of that...programming the donor vehicle #.
What code/codes came up? ..should be a B-code
Did they replace the Ignition switch or Ignition lock cylinder?.
If they diagnosed it as an "Ignition switch" and it didn't correct the problem,take it back to them...
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achieva
Novice
Feb 29, 2008, 2:54 PM
Post #8 of 8
(6421 views)
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Re: Body Control Module
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I called the mechanic and he wasn't sure about the code, thought it was a P code (has been 2 weeks or so). The check engine light also coded the idle air control which he changed from the original motor and it cleared, however, the check engine light is back on. The Chevrolet dealer has no idea what the problem is and now suggest changing the BCM and I can't see doing it. The car started every time before the engine swap, now won't start at all. It will not even reset now with the reset protocol mentioned above. Mechanic suggest disconnecting battery cables, touching them together to clear the computer long enough to trade it in, but even that is not working. Every time they work on it the problem gets worse. At least it ran before even though the rod was knocking.
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