Body Control Module: Description and Operation

DASH INTEGRATION MODULE (DIM)
The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.

The DIM functions include the following:
- cigar lighter relay control
- class 2 communication requiring DIM interaction
- exterior lighting control
- headlamp washer control
- hood ajar switch input w/export
- horn relay control
- interior lighting control
- load management
- low side temperature for HVAC compressor
- park key lock output
- power moding control over Class 2 serial data circuit
- reverse lockout solenoid control
- steering wheel controls input
- storage of the clock settings and, sending a message out on the class 2 serial data circuit in response to requests from other modules
- storage of vehicle options and configuration

REAR INTEGRATION MODULE (RIM)
The various RIM inputs and outputs are described in the corresponding functional areas as indicated on the RIM electrical schematics.

The RIM functions include the following:
- BTSI solenoid control
- class 2 communication requiring RIM interaction
- content theft deterrent
- fuel door control
- fuel level sensor input
- heated seat control
- intrusion sensor control
- key in ignition chime control
- performance shift control
- position lamp control
- park brake relay control
- rear defog relay control
- rear foglamp relay control
- rear park assist chime control
- retained accessory power (RAP) relay control
- reverse lamp relay control
- reverse switch input w/manual transmission
- sunroof speed control
- traction mode switch input
- transmission shift inhibit
- trunk ajar input
- trunk entrapment sensor input
- trunk release relay control
- winter mode switch w/automatic transmission

The CTD system is an internal function of the Rear Integration Module (RIM) which utilizes class 2 serial data and various switch input information to perform CTD functions. When the RIM detects an unauthorized entry, the RIM commands the Dash Integration Module (DIM) to activate the horns and exterior lamps via the class 2 serial data line. The RIM has five basic modes (disarmed, standby, delayed, armed, and alarm) for operating the CTD system.

The different modes are described below.
1. The RIM has the CTD system in a disarmed mode until the following conditions are detected:
- Ignition key turned to the OFF position
- Any door open
- Doors locked by either the power door lock switch or the LOCK button on the transmitter
2. The RIM enters the standby mode when the above conditions are detected. In standby mode the RIM commands the instrument cluster to illuminate the SECURITY indicator via the class 2 serial data line. (If all the doors are closed and the LOCK button on the transmitter is used, the RIM enters the delayed mode.
3. When the last door is closed, the RIM enters the delayed mode for 30 seconds. In delayed mode the RIM commands the instrument cluster to illuminate the SECURITY indicator via the class 2 serial data line.
4. After 30 seconds, the RIM enters the armed mode. In armed mode the RIM commands the instrument cluster to turn off the SECURITY indicator via the class 2 serial data line. Any forced entry activates the alarm mode.
5. When the RIM detects a forced entry, the RIM enters the alarm mode. The RIM commands the DIM to activate the horn and exterior lamps for 30 seconds, via a class 2 message. This is followed by a three minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.