Pinpoint Test P : The Electric Park Brake RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On
- NOTE: The electric park brake indicator only illuminates or flashes when a parking brake system or ABS fault is detected. The indicator is off under all other conditions.
Normal Operation and Fault Conditions
See Electric Park Brake. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .
If the parking brake (yellow) indicator request message is missing for less than 5 seconds, the IPC defaults the electric park brake RTT indicator to the last indication state (on or off), based upon the last message received.
If the parking brake (yellow) indicator request message is missing for 5 seconds or longer, the IPC defaults the electric park brake RTT indicator off.
Possible Sources
- Communication concern
- Electric park brake concern
- GWM
- ABS module
- IPC
- P1 CHECK THE MESSAGE CENTER OPERATION
- Ignition ON.
- Close all doors, liftgate and hood.
- Clear all message center warnings by pressing the OK button for each warning present.
- Monitor the door ajar RTT warning indicator.
- Open the driver door.
- Clear the message center popup warning.
- Monitor the door ajar RTT warning indicator.
Is the door ajar RTT warning indicator off with the door closed, and on with the door open?
Yes GO to P2 No GO to Pinpoint Test A - P2 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to the IPC DTC Chart. Refer to Diagnostic Trouble Code (DTC) Chart No GO to P3 - P3 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (DTCs).
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to: Communications Network . No If the park brake RTT indicator is never on, the system is operating correctly. If the park brake RTT indicator is always on, DIAGNOSE the ABS system Diagnostic Trouble Codes (DTCs). REFER to: Anti-Lock Brake System (ABS) and Stability Control .