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I was told i have a bad BCM - Computers & Internet

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BCM almost sounds like a disease... Frankly I don't know who coined the word and how. We need details and we will help you fix your computer. Tell us how it behaved a few minuted or hours before the failure. What was the first failure, or they have told you that it is a bad BCM. What happened after the "repair"? Please gives all details. Usually it is a minor detail that gives us the key to getting you to fix your computer. CONSTANTIN (arzconst)

Posted on Jul 31, 2009


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No break lights are trun lights on the back of my 2009 chevy cobolt all tge lights are good what sould i do i was told the break light switch has went bad but would that stop tge trun lights

The stop lamps on your vehicle are controlled (turned on by the BCM ) - body control module ,turn signal lamps as well . Your vehicle doesn't have a normal brake light switch ,has a low voltage sensor , not to say they can't go bad .
Turn Signal Lamps
The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.
Stop Lamps
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.

The first step in the diagnostic process should always be to check for DTC'S - diagnostic trouble code's ,an follow a service diagnostic trouble chart ,testing electrical circuit's .Not listen to someone say it's the brake switch , because in most case's he has no ideal what he's talking about . I have 30 year's GM experience , the level of electronic's on your vehicle , most people just don't have a clue . Your best bet ,take it to a qualified repair shop . That doesn't mean the dealer either . A lot of good independent repair shop's out there .

Dec 10, 2017 | Cars & Trucks

2 Answers

Why does my fuel gauge read full when its not. I had a battery problem and since changing the battery the gauge reads full how could I fix this problem.

did you scan it first.?
what if the scan tool told you what's wrong,
or a big clue.
the sender, bad
wires to it bad.
BCM cant take to stander because BCM scrambled.
or comm errors from BCM to dash, cant send data to cluster
do the cluster self test yet, per Factor SM book?
if this is confusing, why not get car serviced
as that is what they will do.
chapter 9 page 377 in the SM, tells you what to do
and for sure if P0462 or 463 DTC errors.
here is 1/2 the data path below, then sender end.
The PCM reads this data. (for lots of reason)
and then sends it to the cluster via the CAN bus.
then the cluster shows the fuel level.
why not scan it first.?
and why gue$$?


Jun 24, 2016 | 2006 Jeep Liberty

1 Answer

Abs, Airbag & Battery light. RPMS go crazy !!?

Who told you ?
i was told the only thing left it could be is a bad ground wire but not positive i dont want to spend all the money to find which ground wire if it could be another problem or it there are any other solutions??

The charging system on your vehicle is computer controlled . GM calls it smart charging system . Running diagnostic check on all the modules on the vehicle may shed some light on the problem . Need a professional or factory scan tool to do this . The instrument cluster turns on the battery light when told by the BCM - body control module . A lot of complex electronic involved here , class 2 serial data communication network , modules sharing info on this network . It's hard to under stand whats happening when you don't know how all works .
Charging System Indicator
The body control module (BCM) sends a message to the IPC via the serial peripheral interface (SPI) requesting illumination. The IPC illuminates the charging system indicator when the following occurs:
• The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The BCM receives a class 2 message from the PCM requesting illumination. The also BCM sends a class 2 message to the radio in order to activate an audible warning.
• The IPC performs the displays test at the start of each ignition cycle as commanded by the BCM. The indicator illuminates for approximately 3 seconds.
• The PCM determines that the ignition is on, with the engine off or the ignition is in the accessory position. The BCM receives a class 2 message from the PCM requesting .

GM also had instrument cluster problems 2003 to 2006 . Buy a used one for $ 20.00 bucks at a automotive salvage yard an see if that fixes the problem . Without testing , check codes , this is just a guess .

Are You Smarter Than Smart Charging System MOTOR

Voltage Drop Testing the Charging System

May 08, 2017 | 2003 Chevrolet Malibu

1 Answer

Left rear door ajar has been on for a while and i was told its the bcm. wondering if it might be something else?

Yes it is not the BCM in my opinion it is the door ajar switch inside the door that is defective, a common problem. Have a GM dealer run a BCM self test to confirm this.

Oct 31, 2012 | 2003 Cadillac Escalade Ext

1 Answer

Have a 1998 dodge minivan,PCM,was replaced. now door locks and rear window wiper comes on by itself while driving or parked. gas gauge will get stuck on empty line off and on. we were told can be BCM, is...

If it has something to do with the BCM , there would probably have DTC'S - diagnostic trouble codes stored , An just replace a BCM would cause more problems , same with PCM's ! These modules need to be configured and programmed . Also ,without testing no one could say for sure that the BCM is bad . That would be a guess ! Door locks locking an unlocking could be a bad switch input to the BCM . Watch this video plus part 2 and 3
Door Locks Go Crazy 1

May 04, 2017 | 1998 Dodge Caravan

1 Answer

Have a 1999 Jeep grand cherokee what year BCM is compatible? Will a BCM from a 2003 work in a 1999?


Sep 05, 2012 | 1997 Jeep Grand Cherokee

1 Answer

Where is BCM located on 2002 PT Cruiser locks working even when car is not on have been told to check BCM don't know where to find it

I don't find a body control module for your car, but according to the wiring diagram the door locks are controlled by a keyless entry module which is located on top of the dash behind the ac vents.
There are three fuses that power the module.
Check with your dealer for more details.

Aug 20, 2012 | 2002 Chrysler PT Cruiser

1 Answer

My 2001 L200 Saturn has body control module problems. The mechanic just had it reprogrammed at a Chevy dealership, but he didn't replace the BCM. We've had it back for a couple of days, and so far, it...

reprograming is very common, this is done all the time even with newer cars, some times cars new newer or diffrent programing installed in them and dealer is the only one that can do it unless someone has a dealer scan tool.As far as replacing it would depend on the problem and i think the dealer would of told them the computer was bad. hope this helps.

Sep 18, 2010 | 2001 Saturn SL

2 Answers

2000 Saturn SL2 - replaced ignition then BCM failed. Related?

the problem is not the bcm. the passlock security sensor is in the cylinder and housing, if the cyl and or housing was replaced the system must be relearned. if you replace the bcm you still need to relearn the system or it still will not start.

Dec 30, 2008 | 2000 Saturn SL

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