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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test Q: 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 IC does not receive the ABS status message from the ABS module or the message is deemed invalid by the IC for greater than 5 seconds, the IC sets DTC U0121 and defaults the ABS warning indicator on.

This pinpoint test is intended to diagnose the following:

- ABS module
- IC

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

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Q1 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 on then off. Observe the ABS warning indicator.
- Does the ABS warning indicator turn off when commanded off?

Yes
GO to Q2.

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

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Q2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0121 recorded?

Yes
GO to Pinpoint Test AW. Pinpoint Test AW: DTC U0121

No
GO to Q3.

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Q3 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 Testing and Inspection.

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

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