C0690

DTC C0690, C0691, or C0693





Circuit Description
Battery voltage for the Electronic Suspension Control (ESC) strut actuators is supplied to the ESC module through the damper drive relay circuit. The ESC module energizes the damper relay by opening and closing an internal ground for the damping relay coil control circuit. The ESC module monitors the damper drive relay circuit and each strut actuator high-side and low-side drive circuits for fault conditions.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
DTC C0690
The following conditions must be present to set the DTC:
^ The ESC module detects voltage less than a preset value in the damper drive relay circuit during a damper relay valve OFF state test.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

DTC C0691
The following conditions must be present to set the DTC:
^ The ESC module detects a loss of voltage in the damper drive relay circuit.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

DTC C0693
The following conditions must be present to set the DTC:
^ The ESC module detects voltage greater than a preset value in the damper drive relay circuit during a damper relay ON state test.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Action Taken When the DTC Sets
^ All the strut actuators may be disabled by commanding 0% PWM duty cycle.
^ The vehicle ride will be soft.
^ The vehicle speed will be limited.
^ The SERVICE SUSPENSION SYS and SPEED LIMITED TO XXX messages will be displayed.

Conditions for Clearing the MIL/DTC
^ The scan tool can be used to clear the DTC.
^ The DTC is saved as history when the ESC module no longer sees an out of range feedback voltage in the damper drive relay circuit. 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.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the damper relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the damper relay. The CVRTD fuse supplies power to the coil side of the damper relay.
4. Verifies that the ESC module is providing ground to the damper relay.
5. Tests if ground is constantly being applied to the damper relay.