Last post on Nov 28, 2013 at 8:28 AM
You are in the Chevrolet Impala
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Chevrolet Impala, Lights, Electrical, Sedan
#181 of 446 Re: Body Control Module [neals1820]
Jul 01, 2007 (7:39 am)
I have an 2002 Impala that had "BCM" problems.
If you read my earlier post (going back a couple years)
My dashlights were blinking and I heard clicking noises under the dash. The car had just over 36k miles and the BCM replacement was not covered under warranty!
I had to fight with GM "Chevy" Customer service to negotiate a 50% refund! Back when I had my BCM replaced it cost $360.00. (Pennsylvania Chevy Dealer did repair)
Chevy sent me a check for $180.
Passlock sensor set me back $425! I probably had over 50k on the car when that went bad.
My Impala had every common problem that Impalas are prone to:
Defective BCM, Defective Passlock Sensor, Intake Manifold leaks, Combination Switch problems (Headlights shut off when clicking to High beam!!) Steering input shaft rattle,
Although I received the recall notice for the Catylitic converter, I never had to use it!
GM ought to recall the defective combination switches!
It's fun to drive down the road at night doing 60mph and when you hit your high beam switch, your headlights go out!!
Unfortunately GM will wait for someone to get killed, and after the first billion dollar lawsuit, just maybe they will offer to replace these defective combination switches!
I will never buy another Chevy ever again!
Chevy's are lemons!
#182 of 446 2001 Impala, Strange electrical problems
Jul 03, 2007 (7:16 am)
2001 Impala, 3.4L
1) Power door locks slowly died until they do not work.
2) Rear window defogger inoperable, can't hear the relay clicking.
3) Recently power to the Heater/AC/Blower control panel is erratic, sometimes comes on immediatly, sometimes a few seconds or minutes later. Has nothing to do with temperature.
4) Most recently the fuel gauge is operating erratically, shows full while driving (gas sloshing around). Only time there is a level indicated other than full or empty is when the car is sitting.
From reading comments on this forum I tend to feel it may be the body control module??
Is there any reprogramming involoved? I don't have a keyless entry or alarm, just the basics.
#183 of 446 Re: 2001 Impala, Strange electrical problems [caps620]
Jul 03, 2007 (9:17 am)
If you're lucky it's just your battery going out; my 2000 model did some odd things last time around just before the battery gave up the ghost.
#184 of 446 Re: 2001 Impala, Strange electrical problems [nosirrahg]
Jul 03, 2007 (10:40 am)
Me too, but I beleive it's not. Power door locks have been inoperable for about 6 months now, other problems cropped up after that.
BTW, does the BCM control the power doorlocks, rear window defroster, fuel gauge etc. etc. ? I think it does from earlier discussion on this.
#185 of 446 Re: Security message [bosompal]
Jul 09, 2007 (4:56 am)
Guess what everybody who needs to get your BCM replaced! Go to NAPA, they have the BCM for just under $100.00. You'll still have to go to the dealer to get it "flashed" programmed. You can get a used one from your salvage yard but every dealer I spoke with said the same thing, "it may work for 20 - 40 key cycles then you're back where you started". That was enough for me to go to NAPA and spend the $30.00 more for their new one. Good luck, Rich
#186 of 446 Re: Security message [rstraub]
Jul 09, 2007 (4:47 pm)
How much does the dealer charge to "flash" program it? And being totally ignorant on the subject, do you just hand it to them, they program it, and you install it later? Or does it have to be installed in the car for the programming to happen?
#187 of 446 More annoying than anything...
Jul 11, 2007 (4:56 pm)
Hello all. I have a 2001 Impala LS and recently, while I'm driving down the road, the headlights will flash (just the headlights, not the parking lights or high-beams), the AC compressor cuts off, and the battery light will come on, all at the same time. Then the car acts right for a few seconds and does it all over again. Even after I cut the car off, the headlights will still flash for about 10 - 15 minutes. It starts doing this early in the morning and gets progressively worse the hotter it is outside. All of the symptoms go away when the temperature outside starts dropping. Even with the BCM unplugged and the ignition in the On position, I have the same problem... any suggestions?
#188 of 446 Re: Security message [nosirrahg]
Jul 12, 2007 (2:28 am)
I called around to several different dealers and got anything from $150 to $95 (which is what I ended up going with). I drove to the dealership with the old BCM still in, told the tech I had the new one and would pop it in (it is pretty simple to get in and out if you are careful) and the tech just said "I will do it" and off he went. Took about an hour. It does have to be installed in the car for programming to happen. The dealer I ended up at didn't hassle me alot and was happy to get the $95 since the tech didn't have to be watching the thing the whole time and could work on something else while the BCM was programming. Good luck
#189 of 446 Re: More annoying than anything... [silverbug]
Jul 12, 2007 (3:59 am)
I had this flashing thing happen a couple of times. I just finally had one of my friends disconnect the battery for about 15 minutes and then everything seemed to reset itself. I had tried going to the dealership a few times and of course they couldn't make the car do the same thing...so I've just decided that my car is haunted.
#190 of 446 Re: More annoying than anything... [danhilsmit]
Jul 29, 2007 (1:15 pm)
Man, I read these posts and just shake my head.
Most of these BCM replacements are done needlessly and that is a shame. There is a known problem for the BCM connectors being loose and causing most of the problems described.
If it is determined that it is indeed the BCM that is the problem, then you need to make certain that the updated BCM is installed.
The BCM (Body Control Module) feed all of the body information to the PCM (Powertrian control module), which is essentially the main computer. If the BCM is unable to communicate properly with the PCM, then you have the problems.
Bulletin No.: 04-08-47-003
Date: August 31, 2004
Security Light On, Engine Will Not Crank, Diagnostic Trouble Codes B2958 and/or B2960 (Repair Poor Terminal Connections at Body Control Module)
2000-2005 Chevrolet Impala, Monte Carlo
Some customers may comment on an engine that will not crank. Others may comment on the security light being on.
Technicians may find DTCs (diagnostic trouble codes) B2958 and/or B2960.
These conditions may have several different causes. In each case, however, testing of the BCMs (Body Control Modules) replaced for these conditions are frequently found to be operating to specifications and are believed to have been replaced needlessly. A change was made to the BCM hardware in February of 2003. An updated BCM can be identified by a GMAN169 or higher number found on the BCM part label. This hardware change was made to prevent the remote possibility that a BCM, built after the GMAN169 number, could be the cause of these conditions.
The following are the likely causes of these conditions:
1. Damaged or loose/unseated terminals in these BCM connectors may cause a security light or no start condition:
^ BCM connector C1 (24-way, pink in color), terminal B9 (white wire, circuit 1459)
^ BCM connector C1 (24-way, pink in color), terminal B12 (black wire, circuit 1835)
^ BCM connector C2 (24-way, grey in color), terminal A3 (yellow wire, circuit 1836)
Important: Use only approved tools for removal and testing of terminals. Do not use unapproved tools to probe a terminal as this could cause damage. Use Probe Tool J 35616-6, from the J 35616-B terminal test kit, to test the terminals in the BCM connector.
2. Check all the terminals in both BCM connectors, focusing on the three terminals listed above, for damage and proper seating of the terminal in the connector. If no damage is noted, follow the normal SI diagnostic procedures including clearing codes and attempting to duplicate the concern.
3. Always check for and clear all DTCs after recharging or disconnecting the battery. Attempt to restart the vehicle only after all DTCs have been cleared. This will help prevent an unnecessary BCM replacement due to false DTCs being set while servicing the battery.
4. A BCM should not be replaced when DTCs U1016 and/or U1064 have been set, even though the BCM is turning on the security light. Diagnose and repair or replace components as directed by the diagnostic procedures for these diagnostic trouble codes.
5. A current or history diagnostic trouble code B2958 in the BCM and a loss of battery voltage due to a battery going dead or a battery disconnect may cause a no start condition upon recharging or reconnecting the battery. Clearing the diagnostic trouble code will allow the vehicle to start.
6. The security light may turn on when the IPC (Instrument Panel Cluster) or PCM (Powertrain Control Module) does not receive a state of health message from the BCM within a specified window of time. DTCs U1016 or U1064 may set. Upon receiving the state of health message again, the security light will go out and diagnostic trouble codes will go to history. If this happens frequently, the vehicle may exhibit an intermittent or random flash of the security light.