DTC P1652: Power Control Module Grounding Circuit Malfunction

The PCM controls the powertrain induced chassis pitch by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply ground for the controlled component. Driver has a fault line which is monitored by the PCM. If the fault detection circuit senses a voltage other than what the system expects, the fault line status changes and causes DTC to set.

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. Install scan tool. Disconnect RTD module connector C2. See Figure . Pull terminal C5 out of connector C2. Connect terminal C5 back into RTD module. Turn ignition on. Using a test light connected to battery power, probe Pink/White wire at RTD terminal end. If test light illuminates, go to step  4 . If test light does not illuminate, go to next step
3. Using scan tool, command Chassis Pitch Signal ON. If test light illuminates, go to RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. If test light does not illuminate, go to step  5 .
4. Check Pink/White wire for a short to ground and repair as necessary. See WIRING DIAGRAMS  . When repairs are complete, go to step  8 . If short is not present, go to step  7 .
5. Check Pink/White wire for an open and repair as necessary. See WIRING DIAGRAMS  . When repairs are complete, go to step  8 . If open is not present, go to next step.
6. Check connections at Powertrain Control Module for intermittent operation. See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. See WIRING DIAGRAMS  . After repairs, go to step  8 . If switch and circuits are okay, go to next step.
7. Replace PCM. Go to next step.
8. Turn ignition off. Reconnect all components and connectors. Using scan tool, clear all DTCs and perform RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. If DTC resets, go to step  2 . If DTC does not reset, system is okay.