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

Instrumentation, Message Center and Warning Chimes

Pinpoint Test M: 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 (Instrument Cluster) a command to either flash the ABS warning indicator or to turn it on. If the IC (Instrument Cluster) does not receive the ABS status message from the ABS module or the message is deemed invalid by the IC (Instrument Cluster) for greater than 5 seconds, the IC (Instrument Cluster) sets DTC U0121 (non-hybrid) or U0129 (hybrid) and defaults the ABS warning indicator on.

This pinpoint test is intended to diagnose the following:

- ABS module

- IC (Instrument Cluster)

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

M1 CARRY OUT THE IC (Instrument Cluster) WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.

- Select the IC (Instrument Cluster) ABS warning indicator (ABS_LAMP) active command. 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 M2.

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

M2 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST

- Check for recorded ABS module DTCs from the self-tests.

Are any ABS DTCs recorded?

Yes
REFER to Antilock Brakes / Traction Control Systems.

No
GO to M3.

M3 RETRIEVE THE RECORDED DTCs FROM THE IC (Instrument Cluster) SELF-TEST

- Check for recorded IC (Instrument Cluster) DTCs from the continuous self-test.

Is DTC U0121 or DTC U0129 recorded?

Yes
For DTC U0121, GO to Pinpoint Test AZ Pinpoint Test AZ: DTC U0121.

For DTC U0129, GO to Pinpoint Test BA Pinpoint Test BA: DTC U0129.

No
INSTALL an ABS module. TEST the system for normal operation.