DTC C1722: Left Rear Damper Solenoid (Open Circuit)

The ESC module sends a Pulse Width Modulated (PWM) signal to shock absorbers to control damping. Occasionally, to test integrity of system, ESC module commands each shock to a predetermined PWM duty cycle. It then looks at voltage on solenoid trigger wire, to see if it is lower than expected. If it is lower on 2 separate tests, ESC module assumes trigger wire circuit is open, and sets a code for the corresponding shock absorber. If failed shock is the drivers rear, a DTC C1722 will be set. ESC module will then command PWM duty cycle for failed shock absorber to 0, causing a soft ride on that shock. It will also send a message to 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. Turn ignition off. Disconnect left rear damper solenoid connector. Measure resistance between solenoid connector terminals (solenoid side). If resistance is 9.5-15.5 ohms, go to next step. If resistance is not 9.5-15.5 ohms, replace damper (shock absorber). See SHOCK ABSORBER  under REMOVAL & INSTALLATION. After repairs, go to step  6 .
3. Reconnect left rear damper solenoid connector. Disconnect RTD module connector C2. Check for continuity between harness side of RTD module connector C2, terminals C3 (Dark Green wire) and C4 (Dark Blue/White wire). If 9.5 to 15.5 ohms exists, go to next step. If 9.5 to 15.5 ohms does not exist, locate and repair open in Dark Green or Dark Blue/White wire between RTD module and damper solenoid and go to step  6 . If continuity does not exist, go to next step.
4. Check left rear damper circuit for intermittent malfunction. Using scan tool, cycle left rear damper solenoid while moving wiring and connectors. If intermittent malfunction is found and repaired, go to step  6 . If intermittent malfunction is not found and repaired, go to next step.
5. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs. Cycle left rear damper solenoid for 60 seconds. If DTC C1722 is set, replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step. If DTC C1722 is not set, system is functioning properly.
6. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs.