BCM Programming/RPO Configuration: Description

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If Body Control Module (BCM) is not properly configured, BCM will set default values for some systems, which may cause faults in other systems.

Body Control Module (BCM) Electronically Erasable Programmable Only Memory (EEPROM) chip must be programmed with proper Regular Production Options (RPO) configurations. EEPROM stores information about vehicle options and point of sale. When BCM is replaced, new BCM must be programmed to identify the following information.

Country Of Sale (US, Canada, Europe, Etc.)
Real Time Damping (F45)
Memory Options (AAB)
Front Fog Lights (T96)
HVAC (C60-Manual Or CJ2-Automatic)
Active Handling (JL4)
Automatic Headlight Control (T82)
Power Tilt/Telescoping Steering Column (N37)

Since BCM sends a password to PCM, PCM must also be programmed to accept the new password. BCM programming procedure will enable learn password mode for BCM and PCM (this mode allows PCM to learn new password sent by BCM whenever BCM or PCM is replaced). If BCM is not properly programmed, vehicle will exhibit a no-crank condition and PCM will set DTC P1631.

When BCM is replaced, BCM must be programmed to accept resistance value of existing vehicle keys so that it will allow PASS-Key® operation. New BCM is programmed to accept first PASS-Key® resistance value detected. If BCM is unable to detect a valid PASS-Key® resistance value, BCM will not end programming sequence and DTC 2735 will set.