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DTC C1786: RTD Control Relay Malfunction

  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 C1787 or C1788 is stored. If DTC C1787 or C1788 is stored, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table under SELF-DIAGNOSTICS. If DTC C1787 or C1788 is not stored, go to next step.
  3. Check 10-amp RTD relay fuse (No. 7) located in underhood electrical center. If fuse is blown (open), go to step 6). If fuse is okay, go to next step.
  4. Turn ignition off. Measure voltage between ground and RTD control module connector C2, terminal D13 (Orange wire). If voltage is more than 10 volts, go to step 10). If voltage is less than 10 volts, go to next step.
  5. Turn ignition off. Disconnect RTD relay located in underhood electrical center. Measure voltage between ground and battery circuit of RTD relay connector. If voltage is more than 10 volts, go to step 8). If voltage is less than 10 volts, go to step 9).
  6. Turn ignition off. Disconnect RTD control module connector C2. Check for continuity between ground and RTD control module connector C2, terminal D1 (Orange wire). If continuity exists, go to step 8). If continuity does not exist, go to next step.
  7. Check for short to ground in damper solenoid drive high circuits No. 1114 and No. 1118 (both Dark Blue/White wires), and No. 1116 and No. 1107 (both Light Blue wires). See WIRING DIAGRAM . After repairs, go to step 13). If all wires (circuits) are okay, go to step 12).
  8. Check for open in circuit No. 1040 (connector C2, terminal D1, Orange wire). After repairs, go to step 13). If circuit is okay, go to step 11).
  9. Locate and repair open in underhood electrical center or power feed to electrical center. After repairs, go to step 13).
  10. Check RTD relay circuit for intermittent short to ground in Orange wire. Check for short to ground on any damper solenoid drive high circuit. See NOTES ON INTERMITTENTS  under SELF-DIAGNOSTICS. See WIRING DIAGRAM . After repairs, go to step 13). If Orange wire and damper drive high circuits are okay, system is functioning properly.
  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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