Posted: Tue Nov 10, 2009 11:09 pm Post subject: pcm / bcm ????
Im not very car literate but can someone explain what the PCM and BCM's are...and how do you tell if your car has passlock...Also when you push lock and your keychain shoul the horn beep?? thanks in advance!!
I'lll try and make this easy to understand... PCM stands for "Powertrain Control Moduele". You can think of it as the brain of your car. It is very rare that in an Impala that a PCM needs replacing. Usually the problem is the BCM or "Body Control Moduele". I like to think of it as the BCM controls almost all of the electrical system such as your lights and door locks.
I'm not 100% on this but I believe every Impala will have the Passlock system. Which is the security system of your vehicle. Turn the key to the On position and the battery/security light should flash back and fourth.
When locking the car, having the horn beep is a feature. I didn't know if it was supposed to do that either when I bought the car because I knew most GM's did it, but not mine for some reason. If you have your owners manual, there should be a page that tells you how to turn that on or off using the radio controls.
Posted: Tue Nov 10, 2009 11:28 pm Post subject: thanks
my instrument panels lights dont all come on so I dont know if the battery/ security light flashes or not the only lights i get are the brake, seatbelt and airbag...how would you know if you had a bad bcm?once again thanks for the help!!
A bad BCM can trigger all sorts of electrical problems. When mine went the interior accessories wouldn't power down with the car. Another member lost power locks. Sometimes the service traction soon light/traction control lights turn on for no reason.
Protip: If you don't know what you're doing, don't do it.
Posted: Tue Nov 10, 2009 11:45 pm Post subject: problems
I cant get my message center to work, I get only the brake,seatbelt and airbag lights to come on when ignition is on( i thought engine, oil trans ect lights should also come on) and I get a long series of chimes after car is started dont know what they are for cause no lights are on.. but hte car runs perfect as far as i can tell..
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