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Home >> Cadillac >> 1999 >> Seville STS >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension - Electronic CV Road-Sensing >> Diagnostic Tests >> Code C1768: Position Sensor Supply Fault

Code C1768: Position Sensor Supply Fault

  1. Perform CVRSS system check. See CVRSS SYSTEM CHECK  . After performing CVRSS system check, go to next step.
  2. Turn ignition on, with engine off. Using DVOM, backprobe measuring voltage at left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module connector C2. See WIRING DIAGRAMS  . If voltage is less than 6 volts, go to step  4 . If voltage is more than 6 volts, go to next step.
  3. If voltage is more than 9 volts, go to step  12 . If voltage is less than 9 volts, go to step  20 .
  4. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Check continuity between left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. Repair as necessary. If circuit is okay, go to next step.
  5. Check continuity between right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . Repair as necessary. If circuit is okay, go to next step.
  6. Check continuity between left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. Repair as necessary. If circuit is okay, go to next step.
  7. Check continuity between right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. Repair as necessary. If circuit is okay, go to next step.
  8. Check continuity between left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and left rear position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. See WIRING DIAGRAMS  . Repair as necessary. If circuit is okay, go to next step.
  9. Check continuity between right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and right rear position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. Repair as necessary. If circuit is okay, go to next step.
  10. Check continuity between left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and left front position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. Repair as necessary. If circuit is okay, go to next step.
  11. Check continuity between right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and right front position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. See WIRING DIAGRAMS  . Repair as necessary. If circuit is okay, go to next step.
  12. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Turn ignition on, with engine off. Using DVOM, measure voltage between left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. If voltage is more than 10 volts, go to step  16 . If voltage is less than 10 volts, go to step  20 .
  13. Using DVOM, measure voltage between right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. If voltage is more than 10 volts, go to step  17 . If voltage is less than 10 volts, go to next step.
  14. Using DVOM, measure voltage between left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . If voltage is more than 10 volts, go to step  18 . If voltage is less than 10 volts, go to next step.
  15. Using DVOM, measure voltage between right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. If voltage is more than 10 volts, go to step  19 . If voltage is less than 10 volts, go to step  20 .
  16. Repair short to voltage in left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  17. Repair short to voltage in right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  18. Repair short to voltage in left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  19. Repair short to voltage in right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  20. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See CALIBRATING CVRSS CONTROL MODULE  under ADJUSTMENTS.
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