Is a amp capacitor enough to keep the BCM's memory even if I disconnect the battery?

Asked by Feb 26, 2017 at 01:40 AM about the 2003 Chevrolet Malibu FWD

Question type: Maintenance & Repair

I'm trying to reset the BCM. I unplugged the battery
for 10 minutes and it didn't work. Now I'm thinking
that either I didn't unplug the battery for long
enough, or the capacitor that I'm using for my amp
is providing enough power to keep the memory
stored in the BCM. Does anyone think that's
possible?

3 Answers

121,475

Yes it is possible, it only takes 5 volts and very little amperage to keep the memory circuits active, that's why the cheapest preset saver tools all use a 9 volt battery as the power source. However disconnecting the battery can have serious side effects on the vehicles BCM, I highly recommend that you take it to someplace like autozone and see if they can just erase the existing codes, this will put both the ECM and the BCM back to factory default and you won't have to worry about programming loss and wind up at a dealership having the system reflashed. It's not suppose to happen on your year of vehicle but don't take that 100 dollar chance. HTH

124,415

http://ls1tech.com/forums/pcm-diagnostics-tuning/1596433-gm- computer-relearn-procedure.html

68,005

Disconnect the amp capacitor, disconnect the battery, briefly turn on the headlights while battery is disconnected. Like "tennisshoes" posted the best way to reset trouble codes is have them erased with a code scanner, although I am not sure if that will actually reset the BCM.

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