Diagnostic Functions: Programming

To increase the security of the immobilizer system, the following control modules are linked to each other with codes.

• central electronic module (CEM)
• engine control module (ECM).
• Keyless vehicle module (KVM) (only vehicles with the keyless locking system)
• Start control module (SCU)
• Steering Column Lock Module (SCL) (does not apply to USA/CDN market for 2009-).

Codes must be programmed when replacing the control module in order for the vehicle to start. Furthermore, the serial number for the Brake control module (BCM) is checked by the Engine control module (ECM) before the Engine control module (ECM) permits the vehicle to start. This requires that the serial number in the Brake control module (BCM) be entered into the Engine control module (ECM) when replacing the Brake control module (BCM) or replacing the Engine control module (ECM). This occurs automatically when downloading software into the new control module.