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Home >> Cadillac >> 2001 >> DeVille Base >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Suspension - CV Road Sensing >> Diagnostic Tests >> DTC C0635, C0638, C0640, Co643, C1252 Or C1253: Normal Force Circuit Malfunction (2001 Models)

DTC C0635, C0638, C0640, Co643, C1252 Or C1253: Normal Force Circuit Malfunction (2001 Models)

  1. Perform DIAGNOSTIC SYSTEM CHECK  . After performing diagnostic system check, go to next step.
  2. Install scan tool. Start engine. Using scan tool, observe front normal force parameter in Vehicle Stability Enhancement System (VSES)/CVRSS data list. If scan tool display is within 10-90%, check for intermittent and poor connections. See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. If scan tool display is not within 10-90%, go to next step.
  3. Turn ignition switch off. Disconnect suspension control module harness connector. Turn ignition switch on. Measure voltage between ground and normal force signal circuit (White or Gray wire). See WIRING DIAGRAMS  . If voltage is near 12 volts, go to step  5 . If voltage is less than 12 volts, go to next step.
  4. Check normal force signal circuit for a short to ground, high resistance, or an open. See WIRING DIAGRAMS  . If condition was found and repaired, go to step  10 . If condition was not found, go to step  6 .
  5. Check normal force signal circuit for a short to voltage. If a short to voltage was found and repaired, go to step  10 . If a short to voltage was not found, go to step  7 .
  6. Check EBCM harness connector for a poor connection. If a poor connection was found and repaired, go to step  10 . If a poor connection was not found, go to step  8 .
  7. Check suspension control module harness connector for a poor connection. If a poor connection was found and repaired, go to step  10 . If a poor connection was not found, go to step  9 .
  8. Replace EBCM. See appropriate ANTI-LOCK article. If replacement is complete, go to step  10 .
  9. 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.
  10. 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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