DTC C0690: Damper Control Relay Circuit Malfunction

Shock absorber solenoid voltage is supplied to RTD module through the RTD relay circuit. RTD module controls the operation of the RTD relay by grounding the relay control circuit. It then monitors the RTD relay control/solenoid voltage circuits to determine if the circuits are functioning properly. DTC C0690 will be set when the RTD module detects low voltage on relay solenoid supply circuit(s) or if there is a loss of voltage on all 4 shock absorber supply circuits. RTD module will disable all four solenoids (giving a soft ride), send a request to IPC to display SERVICE RIDE CONTROL and SHOCKS INOPERATIVE messages, and send a message to the PCM to limit vehicle speed to 80 MPH.

1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing RTD diagnostic system check, go to next step.
2. Using scan tool, check if DTC C0691 or C0693 is stored. If DTC C0691 or C0693 is stored, go to appropriate DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table under DIAGNOSIS & TESTING. If DTC C0691 or C0693 is not stored, go to next step.
3. Using scan tool, check if DTC C0577, C0582, C0587 or C0592 is stored. If DTC C0577, C0582, C0587 or C0592 is stored, go to appropriate DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table under DIAGNOSIS & TESTING. If DTC C0577, C0582, C0587 or C0592 is not stored, go to next step.
4. Turn ignition off. Disconnect RTD relay. Turn ignition on. Connect test light between ground and RTD relay connector (Orange wire) terminal. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  7 .
5. Check Orange wire of RTD relay for a short to ground or an open. See WIRING DIAGRAMS  . If a short to ground or an open is present, repair and go to step  9 . If short or open is not present, go to next step.
6. Check RTD relay circuit for poor connections or intermittent short. See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. See WIRING DIAGRAMS  . After repairs, go to step 9 . If poor connections are not present, go to step  8 .
7. Repair Orange wire of RTD relay. See WIRING DIAGRAMS  . Go to step  9 .
8. Replace RTD relay. After repairs, go to step  9 .
9. Turn ignition off. Reconnect all disconnected components and connectors. Using scan tool, clear all DTCs. Operate vehicle. Repeat self test. If DTCs reset, go to step  2 . If DTCs do not reset, system is okay.