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Author Topic: Electrical Problems --Bad BCM?  (Read 1055 times)
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darkswitch155
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« on: February 19, 2018, 12:46:29 PM »

I have a 2005 aztek, i recently replaced the battery and alternator and those are working fine. Had the key stuck issue and replaced the lock switch. Now randomly the battery indicator will come on and the vehicle starts to lose power and the cluster dims then car dies. I also notice that my ABS turns on randomlly when i break. Please help of you can. I hope its not the BCM.
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Sebastian
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« Reply #1 on: April 17, 2018, 11:21:44 PM »

I recently had the same problem with the battery light coming on randomly.  After replacing the battery and later the alternator the problem persisted and got worse and the car started to lose power and eventually died.  I finally had to have it towed to the dealer, who was sure it was the bcm, until they replaced that only to have it short out again immediately.  3 weeks and multiple calls to GM later, they finally figured out it was the ignition switch wire heating up and shorting out the bcm.  Ended up costing me $1300 to have them diagnosis, replace the switch and bcm but car has been running fine since.
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B-3
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« Reply #2 on: June 07, 2018, 12:30:35 PM »

Our recently purchased 2004 was running great until I had the gaul to try and install an electric trailer brake controller.  I added a wire with a round connector on the end using the ground screw on the core support by the battery and the positive jumper post on the under hood fuse panel with an inline circuit breaker screwed to the body inside the engine compartment out of the way above the battery. I did this without unhooking the battery.  I haven't hooked the wires up yet and they haven't touched each other. I'm having lots of weird electrical issues now: No instruments, starts and runs but badly, dies if you use the brake pedal or other electrical device, pulsating idle with clicking relays on the fuse panel the BCM is hooked to in time with  Did I fry the BCM or some other component in there with my wiring activities? 
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