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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test P: 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 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 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 sets DTC U2023 and defaults the ABS warning indicator on.

This pinpoint test is intended to diagnose the following:

- ABS module
- IC



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

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P1 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 P2.

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

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P2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND IC SELF-TESTS


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

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

For DTC U2472, Go To Pinpoint Test AD. Pinpoint Tests AD: DTC B2A20 Or U2472

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

No
GO to P3.

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P3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND ABS MODULE SELF-TESTS


- Check for recorded ABS module DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?

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

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

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