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#1
11-18-2007, 01:33 PM
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BCM Module troubles
I brought my 2003 Grand Am into the shop because the horn no longer worked. The mechanic fixed it by taking off the steering wheel. It now works, but now 1/2 of the electrical equipment doesn't work, ie. door locks, trunk release, some dash lights, dome lights, etc. After a few hours of troubleshooting, the mechanic found that 1/2 of the BCM no longer works.
Why would this have happened? How does a BCM fail, and then only half of it? 
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#2
11-18-2007, 03:37 PM
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Re: BCM Module troubles
Welcome to AF.
IT is most likly because a short occured causing the BCM to burn out a few cicuits. Probly when the horn shorted . Though the BCM could have been bad prior to you purchasing it, then for whatever reason something shorted again finishing it off. A used one will work, but a dealer will need to do a relearn procedure, could cost $40-100 for that. A used BCM in a salvage yard around $50-100. A new BCM, $500 plus a relearn. 
__________________
1999 Grand Am SS 3.4 OHV 
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