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DTC C1780: Loss Of Steering Position Signal

The ESC receives a steering position input from Electronic Brake/Traction Control Module (EBTCM) on connector C2 terminal C7 (Light Blue) wire. ESC module will command a firmer ride if the vehicle is in a turn. If the ESC does not detect a valid steering position PWM (Pulse Width Modulated) signal for at least 5 seconds in 4 consecutive ignition cycles, it will set DTC C1780, ignore the steering input, control shocks using Lateral Acceleration data sent by EBTCM on serial data line, and send a request to the IPC to display SERVICE RIDE CONTROL message.

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing RTD diagnostic system check, go to next step.
  2. Using scan tool, check for any stored ABS/TCS DTCs. If any ABS/TCS DTCs are set, see appropriate ANTI-LOCK article under BRAKES. If no ABS/TCS DTCs are set, go to next step.
  3. Using scan tool, monitor steering position sensor input while turning steering wheel. If voltage changes while steering wheel is turned, go to step  5 , If voltage does not change when steering wheel is turned, go to next step.
  4. Check for open or short (to voltage or ground) in Light Blue wire (circuit No. 914) between RTD control module connector C2, terminal C7 and Electronic Brake/Traction Control Module (EBTCM). Repair as necessary. See WIRING DIAGRAMS  . When repair is complete, go to step  8 . If Light Blue wire is okay, go to next step.
  5. Check steering position sensor signal circuit (circuit No. 914) for intermittent operation. See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. After repairs, go to step  8 . If no problem was found, go to next step.
  6. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs. After 5 seconds, check if DTC C1780 resets. If DTC C1780 resets, go to next step. If DTC C1780 does not reset, system is functioning properly.
  7. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  8. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs and perform RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING.
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