Pinpoint Test Q: The Stability/Traction Control Disabled Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test Q: The Stability/Traction Control Disabled Indicator Is Never/Always On

Normal Operation

The traction control switch is hardwired to the Instrument Panel Cluster (IPC). When the traction control switch is pressed, the IPC sends a message to the ABS module over the High Speed Controller Area Network (HS-CAN) indicating the traction control switch has been pressed. The ABS module either disables or enables the stability/traction control system and sends a stability/traction control disabled indicator request back to the IPC to illuminate or turn off the stability/traction control disabled indicator based upon the system state.

When a MyKey(R) programmed key is in use and the AdvanceTrac(R) on feature is configured always on, the stability/traction control system cannot be disabled and the stability/traction control indicator does not illuminate when the traction control disable button is pressed. The stability/traction control indicator still functions normally to indicate a stability/traction control system fault and a stability/traction control active event.

If the stability/traction control disabled indicator request message is missing for less than 5 seconds, the stability/traction control disabled indicator remains in the last state (on or off) based upon the last known good message received. If the stability/traction control disabled indicator request message is missing for more than 5 seconds, the IPC sets DTC U0121:00 in continuous memory and defaults the stability/traction control disabled indicator off.

This pinpoint test is intended to diagnose the following:

- A MyKey(R) programmed key is in use
- Stability/traction control cannot be disabled
- ABS module
- IPC

PINPOINT TEST Q: THE STABILITY/TRACTION CONTROL DISABLED 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 stability/traction control disabled indicator (STAB_TC_LMP) active command. Command the stability/traction control disabled indicator on and off while observing the stability/traction control disabled indicator.
- Does the stability/traction control disabled 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) Instrument Panel Cluster (IPC). TEST the system for normal operation.

-------------------------------------------------
Q2 CHECK FOR THE KEY TYPE

- Check if the key is a MyKey(R) programmed key or an administrator key. Refer to Anti-Theft - Passive Anti-Theft System (PATS) Key Programming.
- Is the key an administrator key?

Yes
GO to Q3.

No
If the MyKey(R) AdvanceTrac(R) on feature is configured always on, the system is normal. The stability/traction control system cannot be disabled when the AdvanceTrac(R) on feature is configured always on. If the MyKey(R) AdvanceTrac(R) on feature is not configured always on, GO to Q3.

-------------------------------------------------
Q3 CHECK THE TRACTION CONTROL INPUT TO THE IPC

- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC traction control switch PID (STAB_CTRL_SW).
- Monitor the traction control PID while pressing and releasing the traction control disable switch.
- Does the traction control PID read RELEASED when the button is released and DEPRESSED when the button is pressed?

Yes
GO to Q4.

No
REFER to Vehicle Dynamic Systems Testing and Inspection to diagnose the stability/traction control system cannot be disabled.

-------------------------------------------------
Q4 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 U0121:00, GO to Pinpoint Test AV Pinpoint Tests AV: DTC U0121:00. For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to Q5.

-------------------------------------------------
Q5 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
INSTALL a new ABS module. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.

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