Multifunction Electronic Control Modules

Module Controlled Functions:

Voice Activated Control Component Location:

Driver Seat Module (DSM)
The DSM is located under the driver seat and controls the seat memory recall positions.

Driver Door Module (DDM)
The DDM is located in the driver door behind the trim panel. The DDM controls the keyless entry operations and global closing.

General Electronic Module (GEM)
The GEM module is located behind the driver side cowl side trim panel. The GEM module controls the wiper and security systems.

Rear Electronic Module (REM)
The REM module is located in the passenger side luggage compartment behind the trim panel. The REM module controls the locking/unlocking of the rear doors. The GEM and DDM modules interact with the REM.

Voice Activated Control Module (VACM)
The VACM is located in the driver side luggage compartment behind the trim panel. The VACM module controls and processes all the voice commands given by the driver, then delivers this information to the audio unit, GSM or AMPS cellular phones and the climate control modules which then carry out these commands.

Steering Column Lock Module (SCLM)
The SCLM is located under the steering column and is connected to the clock spring. The SCLM controls the locking and unlocking of the steering column.

Microphone
The microphone is used for the cellular phone and to receive voice commands for the audio unit and climate control functions. The microphone supplies the information to the VACM which processes the commands and supplies the necessary information to the correct modules.

Visual Feedback Message Center Display
This display keeps the driver informed of the function which is being selected or processed.

Audible Feedback Instrument Cluster
This audible tone informs the driver when the system is able to receive commands for processing.

Verbal Feedback Speakers
These speakers are utilized to confirm to the driver that his verbal command has been accepted and is being proceeded.

Steering Wheel Controls VOICE/PHONE Buttons
This button is automatically configured by the audio unit depending on which systems are equipped on the vehicle. For additional information, refer to the Owner Guide.

Multifunction Electronic Module
The complexity of the electronics involved with the speedometer and instrument cluster, of which the message center is a part, and the multiplexed communication network which are connected to it preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU User Guide for detailed instructions on testing the message center.

The PDU systematically tests and analyses all functions and the various systems affected by it.

Where a fault is indicated, some basic diagnostic methods may be necessary to confirm that connections are good and that wiring is not damaged before installing a new component.