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 Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) communication bus. If a fault condition exists in the ABS, the ABS module sends the IPC 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 IPC defaults the ABS warning indicator to the last on/off state, based upon the last known good ABS status message received. If the ABS status message is missing for more than 5 seconds, the IPC sets DTC U0121:87 and defaults the ABS warning indicator on.

This pinpoint test is intended to diagnose the following:

- ABS module
- IPC



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

-------------------------------------------------
Q1 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC ABS warning indicator (ABS_LAMP) active command on then off. Observe the ABS warning indicator.
- Does the ABS warning indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to Q2.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

-------------------------------------------------
Q2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


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

Yes
For DTC U0121:87, GO to Pinpoint Test AR. Pinpoint Tests AR: DTC U0121:87

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

No
GO to Q3.

-------------------------------------------------
Q3 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 Antilock Brakes / Traction Control Systems.

No
INSTALL a new ABS module. REFER to Antilock Brakes / Traction Control Systems. TEST the system for normal operation.

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