Pinpoint Test U: The Electric Park Brake Indicator Or 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 indicator or 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 indicator or RTT indicator off.
Possible Sources
- Communication concern
- Electric park brake concern
- GWM
- ABS module
- IPC
- U1 IDENTIFY THE IPC (INSTRUMENT PANEL CLUSTER) LEVEL
- Determine if the vehicle is equipped with a base IPC. REFER to: Instrument Panel Cluster (IPC) - Overview
Is the vehicle equipped with a base IPC?
Yes GO to U3 No GO to U2 - U2 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 U4 No GO to Pinpoint Test A - U3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL
- Ignition ON.
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Access the IPC and control the ALL_LAMPSPID
- Command all warning lamps on then off while observing the electric park brake indicator.
Does the electric park brake indicator turn on when commanded on and turn off when commanded off?
Yes GO to U4 No GO to U6 - U4 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. No GO to U5 - U5 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 indicator or RTT indicator is never on, the system is operating correctly. If the park brake indicator or RTT indicator is always on, DIAGNOSE the ABS system Diagnostic Trouble Codes (DTCs). REFER to:Anti-Lock Brake System (ABS) And Stability Control - U6 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION
- Ignition OFF.
- Disconnect and inspect the IPC connector.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the IPC connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.