2003 3.4 BCM Replacement - Chevy Impala Forums
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post #1 of (permalink) Old 02-28-2012 Thread Starter
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2003 3.4 BCM Replacement

Body Control Module Replacement

Removal Procedure



  1. Important
    You must perform the new body control module (BCM) setup when replacing the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration .
  2. Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  3. Remove the left instrument panel insulator. Refer to Closeout/Insulator Panel Replacement - Left in Instrument Panel, Gages and Console.
  4. Disconnect the BCM electrical connectors (2,3,4).
  5. Remove the BCM (1).
Installation Procedure


  1. Install the body control module (BCM) (1).
  2. Connect the BCM electrical connectors (2,3,4).
  3. Install the left instrument panel insulator. Refer to Closeout/Insulator Panel Replacement - Left in Instrument Panel, Gages and Console.
  4. Connect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  5. Perform the new BCM setup. Refer to Body Control Module (BCM) Programming/RPO Configuration .
Body Control Module (BCM) Programming/RPO Configuration

Introduction


During body control module (BCM) related service, the procedures below are designated to set-up the BCM correctly. Before you start, read these procedures carefully and completely.
Setup New Body Control Module (BCM)








Important
The BCM will not function properly if the Setup New BCM procedure is not performed.





Make sure the battery is fully charged before performing the setup procedure.
Make sure all disconnected devices and connectors have been reconnected
Perform the Theft Deterrent Re-learn procedure after successfully finishing the Setup New BCM procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent. If the Theft Deterrent Re-learn procedure is not performed after a BCM replacement, the following conditions may occur:
- The vehicle will not be protected against theft by the PASSLOCK system.
- The engine will not crank nor start.
  1. Connect a Scan Tool (Tech 2) to the Data Link Connector (DLC).
  2. Turn the ignition switch on.
  3. Select Diagnostics and input all of the required data when prompted by the Scan Tool (Tech 2).
  4. Select BODY CONTROL MODULE.
  5. Select SPECIAL FUNCTIONS.
  6. Select Setup New BCM.
  7. Note, Input all of the required data when prompted by the scan tool.
  8. Select Setup SDM Part Number in BCM, and follow the onscreen directions.
  9. Select New VIN, and follow the onscreen directions.
  10. Select Option Configuration, and follow the onscreen directions. .
  11. Select Point of Sale, and follow the onscreen directions. .
  12. Exit back to the SPECIAL FUNCTIONS menu.
  13. When the BCM, VIN, Point of Sale and Option Configuration have been entered, proceed with the Theft Deterrent Re-learn procedure.
  14. If the scan tool displays UNABLE TO PROGRAM BCM. BCM IS SECURED, then the BCM must be replaced and this procedure must be repeated on a new BCM.
NOTE: After the above procedure has been completed, personalization of the BCM defaults to a default setting. Inform the customer that the personalization settings must be set again.

Important


After programming, perform the following to avoid future misdiagnosis:
  1. Turn the ignition OFF for 10 seconds.
  2. Connect the scan tool to the data link connector.
  3. Turn the ignition ON with the engine OFF.
  4. Use the scan tool in order to retrieve history DTCs from all modules.
  5. Clear all history DTCs.

Last edited by Stephen; 02-28-2012 at 10:29 PM. Reason: picture
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post #2 of (permalink) Old 02-28-2012
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nice!! never know when someone is gonna have to change the BCM in their imp
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post #3 of (permalink) Old 02-29-2012
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You can replace it 10 times at the dealer before the cost of the tech 2 will be made up though.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
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post #4 of (permalink) Old 02-29-2012 Thread Starter
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not 10.
maybe 4.

looks like the dealer will do mine.
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post #5 of (permalink) Old 02-29-2012
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Well, when you consider a tech 2 is about $2500, and less than $300 of the cost of the BCM replacement is labor... At any rate, they usually don't go bad more than once. Its nice to see the procedure laid out, I just don't think anyone will be able to use it.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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post #6 of (permalink) Old 02-29-2012 Thread Starter
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I seen the tech 2 going for 1500 to 2000 brand new.
I wish I new someone close that had one I could borrow!
I hate taking my car to the dealership or any shop to get it fixed. I like to do it myself but some things just need to be that way I guess.
I posted this in the 7th gen discussion instead of the DIY section just because of the point you bring up.
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post #7 of (permalink) Old 03-01-2012
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Last time I looked at them, they had them for that price, but they were missing either the cable, or the software to make them work, and it was an extra $500 for that part. I would kill for one of those things, especially here at work... Anyway, this can still be useful to someone who does have one, or has access to one.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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post #8 of (permalink) Old 03-01-2012
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while i was going to school we had a ton of tech 2's and snap on diag tools like the motis laying around brand new and un-inventoried, i should got one lol
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post #9 of (permalink) Old 03-03-2012
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This may be whats wrong with my car. Looks like I am going to have to live with it fo a while.

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post #10 of (permalink) Old 06-07-2012
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So the only way to program a new BCM is through the OBD2 port AFTER the new one has been installed?
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post #11 of (permalink) Old 06-07-2012
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Unless there is some special cable adaptor that I'm unaware of, either way you DO need a tech 2.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Quote:
Originally Posted by kingnutin View Post
Unless there is some special cable adaptor that I'm unaware of, either way you DO need a tech 2.

So I prolly can't buy a new BCM and take it to GM for programming and then install it myself, huh? Well that sucks...
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post #13 of (permalink) Old 06-08-2012
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You could always ask the dealer, I'm not sure.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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post #14 of (permalink) Old 06-08-2012 Thread Starter
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Im pretty sure you would need a new bcm, then install it, then have it towed to the dealership to get it programmed.
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post #15 of (permalink) Old 06-08-2012
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I would just replace it in their parking lot, it only takes like 5 minutes and no tools.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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