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

Instrumentation and Warning Chimes

Pinpoint Tests

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

Normal Operation

The ABS module provides the ABS status to the Instrument Cluster (IC) over the High Speed Controller Area Network (HS-CAN) communication bus. If a fault condition exists in the ABS, the ABS module sends the IC a command to either flash the ABS warning indicator or to turn it on.

If the ABS warning message is missing for less than 5 seconds, the ABS warning indicator remains in the last indication mode (on or off), based upon the last known good data message. If the ABS status message is missing for more than 5 seconds, the IC sets DTC U0121 and defaults the ABS warning indicator on. If the ABS data received is deemed invalid by the IC for 5 seconds or longer, the IC defaults the ABS warning indicator on.

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. 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 O2.

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

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O2 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 AK. Pinpoint Test AK: DTC U0121

For all other DTCs, REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures

No
GO to O3.

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O3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST


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

Yes
REFER to Vehicle Dynamic Systems [1][2]Diagnostic Trouble Code Descriptions.

No
INSTALL a new ABS module. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.

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