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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The status of the ABS system is sent to the Instrument Cluster (IC) from the ABS module over the High Speed Controller Area Network (HS-CAN) communication bus. The IC monitors the ABS input and illuminates the ABS warning indicator when a concern is present.

If the ABS message is missing for less than 5 seconds, the ABS warning indicator remains in the last indication mode (on or off). If the ABS message is missing for more than 5 seconds, the IC sets DTC U0121 in continuous memory and defaults the ABS and brake warning indicators on.

NOTE: If the brake system experiences an Electronic Brake Distribution (EBD) failure, both the brake warning indicator and the ABS warning indicators illuminate.

This pinpoint test is intended to diagnose the following:

- ABS module
- IC



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

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O1 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC ABS warning indicator (ABS_LAMP) active command and command the ABS warning indicator on and off. Observe the ABS warning indicator.
- Does the ABS warning indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to O2.

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

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O2 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST


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

Yes
REFER to Antilock Brakes / Traction Control Systems. Testing and Inspection

No
GO to O3.

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O3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


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

Yes
For DTC U0121, Go To Pinpoint Test AU. Pinpoint Tests AU: DTC U0102

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
INSTALL a new ABS module. TEST the system for normal operation.

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