Grand Cherokee 2WD L6-4.0L VIN S (1997)
Power Mirror Control Module: Description and Operation
SYSTEM OPERATION
A Driver Door Module (DDM) and a Passenger Door Module (PDM) are used on this model to control and integrate many of the electronic
features and functions on the vehicle. The DDM and PDM communicate with each other, and with other vehicle modules on the Chrysler Collision
Detection (CCD) data bus network.
The CCD data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware,
and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of
many new feature capabilities.
Each door module controls the positioning of its respective outside mirror. When the power mirror switch on the DDM is used to position the
passenger side outside mirror, the DDM sends mirror positioning messages to the PDM on the CCD data bus. The PDM then moves the passenger
side mirror accordingly.
Both the PDM and DDM respond to the defogger switch status messages sent by the Body Control Module (BCM) on the CCD data bus to
control the heater elements of their respective mirrors. Refer to Electrically Heated Systems for more information on this feature.
On models equipped with the optional memory system, each door module stores the Driver 1 and 2 mirror position information for its respective
mirror. When the DDM receives a Driver 1 or 2 signal from the Memory Switch or from the Remote Keyless Entry (RKE) receiver in the PDM,
the DDM positions the driver side mirror and sends a memory recall message back to the PDM on the CCD data bus to position the passenger side
mirror.
For diagnosis of the DDM, PDM, or the CCD data bus network, refer to the proper Computers and Control Systems/Body Control Module/Testing
and Inspection Procedures.
