Heated Rear Window: Diagnosis

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

The FEM, REM and DDM constantly monitor their systems and generate diagnostic trouble codes (DTC) if there is a concern. DTCs can be retrieved with the diagnostic tool or an equivalent tester through the SCP communication network.

This vehicle design makes it unique in that electronic functions are divided into zones. The DDM controls features near the driver front door. The FEM controls features in the front portion of the vehicle and the REM controls the features in the rear portion. These systems use the SCP communication network in order to transmit and receive messages. It is vital when diagnosing the vehicle electronic systems to understand where the input (command) originates, all input information messages necessary in order for a feature to operate correctly, which module(s) receive(s) the input (or command message), if the module which received the input (message) controls the output of the feature or does it output a message over the communication network to another module, and which module controls the output of the feature.