Pinpoint Test O: The Traction Assist Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test O: The Traction Assist Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the traction assist data from the ABS module over the High Speed Controller Area Network (HS-CAN) communication bus. The traction assist indicator flashes when the vehicle traction control is in active mode or is being controlled by the ABS module. The traction assist indicator turns on steady if the traction assist system has been disabled through the traction assist switch or if a fault condition exists in the system. The IPC monitors the traction assist message from the ABS module and either flashes the traction assist indicator or turns it on steady depending on the condition. If the traction control message is missing for more than 5 seconds, the IPC sets DTC U0121:00 in continuous memory and defaults the traction assist indicator on.

This pinpoint test is intended to diagnose the following:

- Traction assist concern
- ABS module
- IPC



PINPOINT TEST O: THE TRACTION ASSIST INDICATOR IS NEVER/ALWAYS ON

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O1 CHECK THE TRACTION ASSIST INDICATOR OPERATION USING THE TRACTION ASSIST DISABLE SWITCH


- Ignition ON.
- Press the traction assist disable switch to disable the traction assist system while monitoring the traction assist indicator.
- Does the traction assist indicator illuminate?

Yes
If the traction assist indicator does not operate while in traction active mode, GO to O4.

If the traction assist indicator operates in traction active mode, the system is operating normally at this time.

No
GO to O2.

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O2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


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

Yes
For DTC P174F:23, REFER to Antilock Brakes / Traction Control Systems. Testing and Inspection


For DTC U0121:00, Go To Pinpoint Test AR. Pinpoint Tests AR: DTC U0121:00

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

No
GO to O3.

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O3 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. Testing and Inspection


No
GO to O4.

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O4 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.
- Enter the IPC active command mode and select the traction assist indicator (TC/IVD/RSC_LMP) active command. Command the traction assist active indicator on and off while observing the traction assist indicator.
- Does the traction assist indicator illuminate when commanded on, and turn off when commanded off?

Yes
INSTALL a new ABS module. TEST the system for normal operation.

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

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