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Home >> Cadillac >> 2000 >> Eldorado ETC >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Suspension - CV Road Sensing >> Diagnostic Tests >> DTC C0690, C0691 Or C0693: Damper Control Relay Circuit Malfunction

DTC C0690, C0691 Or C0693: Damper Control Relay Circuit Malfunction

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  . After performing diagnostic system check, go to next step.
  2. Install scan tool. Turn ignition switch on. Using scan tool, command Damper Relay ON and OFF. If damper relay turns on and off with each command, check for intermittent and poor connections in wiring system. See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. If damper relay did not turn on and off with each command, go to next step.
  3. Turn ignition switch off. Disconnect damper relay harness connector. Turn ignition switch on. Using a test light connected to a good ground, probe coil side feed circuit of damper relay harness connector. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  10 .
  4. Connect test light between damper relay harness connector coil side feed circuit and control circuit. See WIRING DIAGRAMS  . Using scan tool, command damper relay on and off. If test light turns on and off with each command, go to step  8 . If test light did not turn on and off with each command, go to next step.
  5. If test light remained illuminated with each on and off command, go to step  7 . If test light did not remain on with each on and off command, go to next step.
  6. Check damper relay control circuit for an open. See WIRING DIAGRAMS  . If an open was found and repaired, go to step  13 . If an open was not found, go to step  9 .
  7. Check damper relay control circuit for a short to ground. See WIRING DIAGRAMS  . If a short to ground was found and repaired, go to step  13 . If a short to ground was not found, go to step  9 .
  8. Check damper relay harness connector for a poor connection. If a poor connection was found and repaired, go to step  13 . If a poor connection was not found, go to step  11 .
  9. Check suspension control module harness connector for a poor connection. If a poor connection was found and repaired, go to step  13 . If a poor connection was not found, go to step  12 .
  10. Repair damper relay coil side feed circuit. See WIRING DIAGRAMS  . When repair is complete, go to step  13 .
  11. Replace damper relay. If replacement is complete, go to step  13 .
  12. Replace suspension control module. See ESC/CVRSS CONTROL MODULE  under REMOVAL & INSTALLATION. Calibrate NEW control module. See CALIBRATING ESC/CVRSS CONTROL MODULE  under ADJUSTMENTS. If replacement is complete, go to next step.
  13. Using scan tool, clear DTCs. Operate vehicle under normal driving conditions. If DTC resets, go to step  2 . If DTC does not reset, system is okay.
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