Body Control Module

Service replacement BCM must be programmed with proper Regular Production Option (RPO) configurations using a scan tool. EEPROM stores information regarding vehicle options and point of sale. If BCM is not properly configured with correct RPO codes, BCM will set default values for some systems, which could cause malfunctions in other systems.

When BCM is replaced, 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 headlight control.
• Power tilt/telescope column.

BCM sends password information to PCM on serial data line to enable fuel for Vehicle Theft Deterrent (VTD) functions, therefore, PCM must also be programmed to accept new password sent by BCM. BCM programming procedure will enable learn password mode for both BCM and PCM. This mode allows PCM to learn new password sent by BCM whenever BCM or PCM is replaced. If BCM and PCM are not properly programmed together, vehicle will exhibit a no start condition and PCM will store a DTC P1631. When an ignition key or BCM is replaced, BCM must be programmed to accept resistance value of new or existing vehicle keys in order to allow PASS-Key(R) operation. See THEFT DETERRENT SYSTEM  .