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DTC 1791: Ride Control Switch Contact Fault

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK . After performing RTD diagnostic system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, select RIDE CONTROL SWITCH voltage display. Observe voltage with ride control switch in PERF, SPORT and TOUR positions. If voltage is .5-3.5 volts, go to step 6). If voltage is not .5-3.5 volts, go to next step.
  3. Turn ignition off. Disconnect ride control switch connector. Ensure ride control switch is not in-between switch positions. Measure resistance between terminals of ride control switch (component side) with switch in PERF, SPORT and TOUR positions. With switch in PERF position, resistance should be 250-350 ohms. With switch in SPORT position, resistance should be 80-180 ohms. With switch in TOUR position, resistance should be 25-75 ohms. If resistance is as specified, go to next step. If resistance is not as specified, go to step 10).
  4. Turn ignition on, with engine off. Measure voltage between ground and 5-volt reference circuit (Tan/White wire) of ride control switch harness connector. See WIRING DIAGRAM . If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step 8).
  5. Using scan tool, monitor ride control switch voltage. Connect fused jumper wire between ride control switch harness connector Tan/White and Pink/White wires. If voltage is 0-0.5 volt, go to next step. If voltage is not 0-0.5 volt, go to step 9).
  6. Check ride control switch and circuits for intermittent operation. See NOTES ON INTERMITTENTS  under SELF-DIAGNOSTICS. See WIRING DIAGRAM . After repairs, go to step 12). If switch and circuits are okay, go to next step.
  7. Turn ignition off. Reinstall/reconnect all components/ connectors that were removed or disconnected. Turn ignition on. Using scan tool, select clear all DTCs. If DTC C1791 is current, go to step 11). If DTC C1791 is not current, system is functioning properly.
  8. Check circuit No. 1384 (Tan/White wire) for short to ground, short to voltage or an open between ride control switch and RTD control module connector C1, terminal A7. See WIRING DIAGRAM . After repairs, go to step 12). If circuit No. 1384 is okay, go to step 11).
  9. Check circuit No. 1385 (Pink/Black wire) for short to voltage or an open between ride control switch and RTD control module connector C2, terminal D7. See WIRING DIAGRAM . After repairs, go to step 12). If circuit No. 1385 is okay, go to step 11).
  10. Replace ride control switch. See RTD CONTROL SWITCH  under REMOVAL & INSTALLATION. After repairs, go to step 12).
  11. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  12. Turn ignition off. Reinstall/reconnect all components/ connectors. Using scan tool, clear all DTCs and perform RTD DIAGNOSTIC SYSTEM CHECK .
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