I had to buy a new bcm because mine burnt out. and of course now the car is not starting due to the code p1631-Theft Deterrent System Password Incorrect. SO exactly how do i reprogram to the new vin?
thanx

 

You must use a GM Tech-II device to reprogram the BCM. A dealer or maybe a shop can do it for you. The Tech-II is $2500 to buy...

 

But if you were curious here it is. Its for a 2000 buts its the same.
Document ID # 568220
2000 Chevrolet/Geo Corvette

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Body Control Module (BCM) Programming/RPO Configuration
The service BCMs EEPROM chip must be programmed with the proper RPO configurations by using a scan tool. The EEPROM stores information regarding the vehicle options and point of sale. If the BCM is not properly configured with the correct RPO codes, the BCM will set default values for some systems, which could cause malfunctions in other systems. When the BCM is replaced, the BCM must be programed to identify the following information:

Country of Sale (US, Canada, Europe, Japan, etc.)
Real Time Damping (RTD)
Memory Options
Front Fog Lamps
HVAC (C60-Manual, CJ2-Automatic)
Active Handling
Auto Headlamp Control
Power Tilt/Telescope Column
The BCM sends password information to the PCM on the serial data line to enable fuel for Content Theft Deterrent (CTD) functions, therefore, the PCM must also be programmed to accept the new password sent by the BCM. The BCM programming procedure will enable the learn password mode for both the BCM and PCM. This mode allows the PCM to learn the new password sent by the BCM whenever the BCM or PCM is replaced. If the BCM and PCM is not properly programmed together, the vehicle will exhibit a no start condition and the PCM will store a DTC P1631.

When an ignition key or the BCM is replaced, the BCM must be programmed to accept the resistance value of the new or existing vehicle keys in order to allow PASS-Key® operation. When the BCM is replaced, the service replacement BCM is programmed to accept the first PASS-Key® resistance value detected. If the BCM is unable to detect a valid PASS-Key® resistance value, the BCM will never end the programming sequence and a DTC B2735 will set. The BCM can also be programmed to accept a new PASS-Key® code by completing the following BCM/PASS-Key® programming procedure:


Important:
Before proceeding with this programming procedure, check for proper communications between the BCM and PCM. If communications cannot be established, refer to the appropriate Diagnostic System Check for the system unable to communicate.

Maintain the battery voltage while the PCM is in the Auto Learn Procedure. Follow this procedure exactly as indicated or you will have to repeat the procedure from the beginning.


Manual Programming (Domestic/Canada Only)
Using a Tech 2, select New BCM Setup and program the BCM with the correct RPO code configuration.
Turn ON the ignition leaving the engine OFF for 11 minutes.
Turn OFF the ignition for 30 seconds.
Turn ON the ignition leaving the engine OFF for 11 minutes.
Turn OFF the ignition for 30 seconds.
Turn ON the ignition leaving the engine OFF for 11 minutes or until DTC P1630 sets.
Turn OFF the ignition for 30 seconds.
Turn ON the ignition leaving the engine OFF and wait 30 seconds.
Attempt to start the engine. If the engine does not start, Refer to the Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.

Important
Performing this procedure may cause a DTC P1630 to set. If a DTC P1630 sets, turn OFF the ignition for 30 seconds, then turn ON the ignition. If the DTC P1630 does not clear, Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.


Tech 2 to Techline Terminal
Using a Tech 2, select New BCM Setup and program the BCM with the correct RPO code configuration.
Enter the Service Programming System (SPS) using a Tech 2.
Enter the vehicle information.
Choose the Request Info soft key on the Tech 2.
Select Done.
Follow the instructions on the Vehicle Set-up screen.
Disconnect the Tech 2 from the vehicle.
Connect the Tech 2 to the Techline terminal.
At the Techline terminal select Service Programming System (SPS) and select terminal to Tech 2 programming method.
Select Done.
Follow the instructions on the remaining screens.
Select the Vehicle Theft Re-learn option.
Select Program at the summary screen. The terminal will download information to the Tech 2.
Return the Tech 2 to the vehicle.
Connect the Tech 2 to Diagnostic Link Connector (DLC).
Select Service Programming from the Tech 2 main menu.
Answer the prompts regarding the model year and vehicle type.
Press the Theft Re-learn soft key on the Tech 2.
Follow the instructions on the remaining screens.
Attempt to start the engine. If the engine does not start, Refer to the Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.

Important
Performing this procedure may cause a DTC P1630 to set. If a DTC P1630 sets, turn OFF the ignition for 30 seconds, then turn ON the ignition and P1630 clears. If the DTC P1630 does not clear, Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.


Techline Terminal to Vehicle (No Tech 2)
Using a Tech 2, select New BCM Setup and program the BCM with the correct RPO code configuration.
Enter the Service Programming System (SPS) using a Techline Terminal (T-50/T-60).
Select terminal to vehicle programming.
Select Done.
Follow the instructions on the Vehicle Set-up screen.
Select the Vehicle Theft Re-learn option.
Follow the instructions on the remaining screens.
Attempt to start the engine. If the engine does not start, Refer to the Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.

Important
Performing this procedure may cause a DTC P1630 to set. If a DTC P1630 sets, turn OFF the ignition for 30 seconds, then turn ON the ignition. If the DTC P1630 does not clear, Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.



Important
After programming, perform the following to avoid future misdiagnosis:


Turn the ignition OFF for 10 seconds.
Connect the scan tool to the data link connector.
Turn the ignition ON with the engine OFF.
Use the scan tool in order to retrieve history DTCs from all modules.
Clear all history DTCs.