Pinpoint Test Ah: The Mil (Malfunction Indicator Lamp) Is Never Or Always On
- Normal Operation and Fault Conditions
See MIL. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .
If the MIL request message is missing or invalid for less than 5 seconds, the IPC defaults the MIL to its last state (on or off) based upon the last known good message received.
If the MIL request message is missing for 5 seconds or longer, the IPC defaults the MIL on.
Possible Sources
- Communication concern
- GWM
- PCM
- IPC
- AH1 IDENTIFY THE IPC (INSTRUMENT PANEL CLUSTER) LEVEL
- Determine if the vehicle is equipped with a base or mid-level IPC. REFER to: Instrument Panel Cluster (IPC) - Overview
Is the vehicle equipped with a base or mid-level IPC?
Yes GO to AH3 No GO to AH2 - AH2 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 AH4 No GO to Pinpoint Test A - AH3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Access the IPC and control the TRANSA_LMPPID
- Command the MIL on and off.
Does the MIL illuminate when commanded on and turn off when commanded off?
Yes GO to AH4 No GO to AH8 - AH4 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the IPC self-test.
- Check for recorded Diagnostic Trouble Codes (DTCs).
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to the IPC DTC Chart. No GO to AH5 - AH5 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 MIL is never on, the system is operating correctly at this time. If the MIL is always on, GO to AH6 - AH6 CHECK THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) AND KOER (KEY ON, ENGINE RUNNING) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the KOEO self-test.
- Start the engine.
- Using a diagnostic scan tool, perform the KOER self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to the Master DTC Chart. No GO to AH7 - AH7 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) KAM (KEEP ALIVE MEMORY) RESET
- Turn the engine off.
- Ignition ON.
- Using the diagnostic scan tool, perform the PCMKAM reset.
Is the MIL still illuminated?
Yes DISCONNECT the battery for approximately 15 minutes, then RECONNECT the battery. If the MIL is still illuminated, GO to AH8 No The system is operating correctly at this time. - AH8 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.