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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The status of the ABS system is sent to the Instrument Cluster (IC) from the ABS module over the High Speed Controller Area Network (HS-CAN). The IC monitors the ABS input and illuminates the ABS warning indicator when a concern is present.

NOTE: When the ABS module detects an Electronic Brake Distribution (EBD) fault, the ABS module sends a message to the IC. Whenever the IC receives an EBD message from the ABS module, the IC turns on both the brake warning indicator and the ABS warning indicator simultaneously.

This pinpoint test is intended to diagnose the following:

- ABS module
- IC



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

-------------------------------------------------
K1 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST


- Retrieve the recorded ABS module DTCs from the self-test.
- Are any ABS module DTCs retrieved?

Yes
REFER to Antilock Brakes / Traction Control Systems.

No
GO to K2.

-------------------------------------------------
K2 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 U1900, REFER to Information Bus.

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

No
GO to K3.

-------------------------------------------------
K3 CARRY OUT THE IC INDICATOR LAMP 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 and off. Observe the ABS warning indicator.
- Does the ABS warning indicator illuminate when commanded on, and turn off when commanded off?

Yes
INSTALL a new ABS module. REFER to Antilock Brakes / Traction Control Systems. TEST the system for normal operation.

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

-------------------------------------------------