C0643

Circuit Description
The Electronic Suspension Control Module estimates the road surface and communicates that information to the Electronic Brake Control Module (EBCM) using the Left and Right Normal Force outputs. The EBCM uses this information to provide improved rough-road braking performance.

Conditions for Running the DTC
^ The ignition is on.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with the scan tool.

Conditions for Setting the DTC
The DTC is set when the Electronic Suspension Control Module measures a feedback voltage greater than a preset value during a Right Normal Force output ON state.

Action Taken When the DTC Sets
^ Both Left and Right Normal Force outputs will be set to default output states.
^ The SERVICE RIDE CONTROL message will be displayed.

Conditions for Clearing the MIL/DTC
^ The scan tool can be used to clear the DTC.
^ The On-Board diagnostic CLEAR RSS CODES feature can be used to clear the DTC.
^ The DTC is saved as history when the Electronic Suspension Control Module no longer sees a high feedback voltage during five (5) consecutive Right Normal Force output ON states. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

Diagnostic Aids
Refer to Testing for Intermittent and Poor Connections in Wiring Systems.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks for a short to voltage in the Right Normal Force circuit.