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DTC C1787: RTD Control Relay Circuit (Open Or Short To Ground)

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK . After performing RTD diagnostic system check, go to next step.
  2. Using scan tool, check if DTC C1786 is stored. If DTC C1786 is stored, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table under SELF-DIAGNOSTICS. If DTC C1786 is not stored, go to next step.
  3. Turn ignition off. Disconnect RTD relay located in underhood electrical center. Turn ignition on. Measure voltage between ground and battery circuit of RTD relay connector. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 10).
  4. Turn ignition off. Disconnect RTD control module connector C2. Check continuity between ground and RTD control module connector C2, terminal C13 (Dark Blue wire). If continuity exists, go to step 8). If continuity does not exist, go to next step.
  5. Measure resistance of RTD relay coil between terminals No. 1 and 2 (or terminals No. 85 and 86). If resistance is 75-105 ohms, go to next step. If resistance is not 75-105 ohms, go to step 11).
  6. Turn ignition off. Reconnect RTD relay. Measure voltage between ground and RTD control module connector C2, terminal C13 (Dark Blue wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 9).
  7. Check RTD relay circuit No. 641 (Dark Blue wire) for intermittent operation. See NOTES ON INTERMITTENTS  under SELF-DIAGNOSTICS. See WIRING DIAGRAM . After repairs, go to step 13). If circuit is okay, go to step 12).
  8. Locate and repair short to ground in underhood electrical center or circuit No. 641 (Dark Blue wire) between underhood electrical center and RTD control module connector C2, terminal C13. See WIRING DIAGRAM . After repairs, go to step 13).
  9. Locate and repair open in circuit No. 1040 (Orange wire) between underhood electrical center and RTD control module connector C2, terminal D1. See WIRING DIAGRAM . After repairs, go to step 13).
  10. Locate and repair open in underhood electrical center, 10-amp RTD fuse (fuse No. 7) or power feed to underhood electrical center. After repairs, go to step 13).
  11. Replace RTD relay. After repairs, go to step 13).
  12. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  13. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs and perform RTD DIAGNOSTIC SYSTEM CHECK .
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