Pinpoint Test M: The ABS Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test M: The ABS Warning Indicator Is Never/Always On

Normal Operation

The ABS module provides the ABS status to the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) communication bus. If a fault condition exists in the ABS, the ABS module sends the IPC a command to either flash the ABS warning indicator or to turn it on. If the ABS status message is missing for less than 5 seconds, the ABS warning indicator remains in the last indication mode (on or off). If the ABS status message is missing for more than 5 seconds, the IPC sets DTC U0121:00 and defaults the ABS warning indicator on.

This pinpoint test is intended to diagnose the following:

- ABS module
- IPC

PINPOINT TEST M: THE ABS WARNING INDICATOR IS NEVER/ALWAYS ON

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M1 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC ABS warning indicator (ABS_LAMP) active command. 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 M2.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

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M2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?

Yes
For DTC U0121:00, GO to Pinpoint Test AU. Pinpoint Tests AU: DTC U0121:00

For all other DTCs, REFER to DTC Charts.

No
GO to M3.

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M3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST

- Check for recorded DTCs from the ABS module self-test.
- Are any DTCs recorded?

Yes
REFER to Vehicle Dynamic Systems Testing and Inspection.

No
If the ABS warning indicator is never on, the system is operating normally.

If the ABS warning indicator is always on, INSTALL a new ABS module. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.

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