Pinpoint Test O: The Abs (Anti-Lock Brake System) Warning Indicator Is Never Or Always On

Normal Operation and Fault Conditions
See ABS Warning Indicator and ABS/Brake/Stability-Traction Control System Indication. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

If the ABS warning indicator request message is missing for less than 5 seconds, the IPC defaults the ABS warning indicator to its last indication state (on or off), based upon the last message received.

If the ABS warning indicator request message is missing for 5 seconds or longer, the IPC defaults the ABS warning indicator on.

Possible Sources
- Communication concern
- ABS concern
- GWM concern
- IPC

O1 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to DTC Chart: Instrument Panel Cluster (IPC) .

No GO to O2

O2 PERFORM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the ABS module self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to: Anti-Lock Brake System (ABS) and Stability Control

No GO to O3

O3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Select the IPC ABS warning indicator (ABS_LAMP) PID.
- Command the ABS warning indicator on then off. Observe the ABS warning indicator.
Does the ABS warning indicator turn on when commanded on and turn off when commanded off?

Yes GO to O4

No INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC) .

O4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes	REFER to: Communications Network

No	If the ABS warning indicator is always on, INSTALL a new ABS module. REFER to: Anti-Lock Brake System (ABS) Module If the ABS warning indicator is never on, the system is operating correctly.