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Home >> Cadillac >> 1997 >> Eldorado Base >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension - Electronic CV Road Sensing >> Testing & Diagnosis >> Code C1781: Steering Sensor Supply OVERCURRENT Fault

Code C1781: Steering Sensor Supply OVERCURRENT 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 between 5-volt reference circuit (Gray wire) of CVRSS control module connector C2 and ground. See WIRING DIAGRAMS  . If voltage is more than 6 volts, go to step 5). If voltage is less than 6 volts, go to next step.
  3. If voltage is less than 4 volts, go to step 7). If voltage is more than 4 volts, go to next step.
  4. Clear CVRSS codes. Wait 30 seconds. Display CVRSS codes. If Code C1781 is set, go to step 15). If Code C1781 is not set, perform CVRSS SYSTEM CHECK  .
  5. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Turn ignition on, with engine off. Using DVOM, measure voltage between 5-volt reference circuit (Gray wire) of CVRSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . If voltage is more than 6 volts, go to next step. If voltage is less than 6 volts, go to step 15).
  6. Turn ignition off. Disconnect steering sensor connector. Turn ignition on, with engine off. Using DVOM, measure voltage between 5-volt reference circuit (Gray wire) of CVRSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . If voltage is less than 6 volts, go to step 11). If voltage is more than 6 volts, go to step 12).
  7. Turn ignition off. Disconnect steering sensor connector. Turn ignition on, with engine off. Using DVOM, measure voltage between 5-volt reference circuit (Gray wire) of CVRSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . If voltage is less than 4 volts, go to next step. If voltage is more than 4 volts, go to step 11).
  8. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Check continuity between 5-volt reference circuit (Gray wire) of CVRSS control module harness connector C2 and ground. See WIRING DIAGRAMS  . If continuity exists, go to step 13). If continuity does not exist, go to next step.
  9. Check continuity between 5-volt reference circuit (Gray wire) and sensor ground circuit (Orange/Black wire) of CVRSS control module harness connector C2. See WIRING DIAGRAMS  . If continuity exists, go to step 14). If continuity does not exist, go to next step.
  10. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Using DVOM, measure voltage between 5-volt reference circuit (Gray wire) of steering sensor harness connector and ground. See WIRING DIAGRAMS  . If voltage is less than 4 volts, go to step 15). If voltage is more than 4 volts, perform CVRSS SYSTEM CHECK  .
  11. Turn ignition off. Replace steering sensor. Perform steering autocenter adjustment. See STEERING AUTOCENTER  under ADJUSTMENTS. After repairs, perform CVRSS SYSTEM CHECK  .
  12. Repair short to voltage in 5-volt reference circuit (Gray wire). After repairs, go to step 16).
  13. Repair short to ground in 5-volt reference circuit (Gray wire). After repairs, go to step 16).
  14. Repair short to ground between 5-volt reference circuit (Gray wire) and sensor ground circuit (Orange/Black wire). After repairs, go to step 16).
  15. 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. Perform CVRSS SYSTEM CHECK  .
  16. Reinstall/reconnect all components/connectors. After repairs, perform CVRSS SYSTEM CHECK  .
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