Body Control Systems: Description and Operation

MODULE CONTROLLED FUNCTIONS

The vehicle is equipped with the following multifunction modules:
- Driver door module (DDM)
- Lighting control module (LCM)

Driver Door Module (DDM)
The DDM monitors the inputs and provides outputs and diagnostic information for the following multiple vehicle systems, including the:
- Power door locks
- Remote keyless entry (RKE) system

The DDM monitors all of the door ajar switches as they are hardwired to the module. This door ajar information is sent to the air suspension module on a single hardwired circuit. Diagnostic information is retrieved from the DDM on the standard corporate protocol (SCP) communication network. The power door locks and the RKE system are all controlled by the DDM. The DDM also receives an input from the luggage compartment lid release switch and operates the luggage compartment lid release solenoid unless the vehicle is equipped with a power luggage compartment lid, in which case the DDM sends a signal to the luggage compartment lid module, which will operate the luggage compartment lid release solenoid.

Lighting Control Module (LCM)
The LCM monitors the inputs and provides outputs and diagnostic information for the following multiple vehicle systems, including the:
- Brake shift interlock
- Exterior lighting
- Interior lighting
- Perimeter alarm

The LCM receives a voltage input from the brake pedal position switch and provides power to the brake shift interlock solenoid. For the exterior lighting, it receives inputs and provides outputs to control the exterior, interior (including the cluster and panel illumination) lighting systems on the vehicle. The perimeter alarm is controlled by the LCM, which receives inputs from the perimeter alarm switches and arms the alarm when commanded.