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

Instrumentation and Warning Chimes

Pinpoint Tests

Pinpoint Test N: 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 message is invalid for 5 seconds or less or if the IC does not receive the ABS message for 5 seconds or less, the IC defaults the ABS warning indicator to the last indication mode (on or off), based upon the last known good 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.

This pinpoint test is intended to diagnose the following:

- ABS module
- IC

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

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N1 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 N2.

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

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N2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST

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

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

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

No
GO to N3.

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N3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST

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

Yes
REFER to Vehicle Dynamic Systems Testing and Inspection.

No
If the ABS warning indicator is never on, the system is operating normally.

If the ABS warning indicator is always on, INSTALL a new ABS module. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.

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