Pinpoint Test J: The LED On The Stability/Traction Control Switch Is Always Illuminated

Anti-Lock Control

Pinpoint Tests

Pinpoint Test J: The LED on the Stability/Traction Control Switch is Always Illuminated

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number

Normal Operation

The LED on the stability/traction control switch is controlled by the Lighting Control Module (LCM). When the Engine Only Traction Control (EOTC) system is disabled through the use of the stability/traction control switch, the PCM sends a message to the Instrument Cluster (IC) along the High Speed Controller Area Network (HS-CAN) bus. The IC will relay this message to the LCM over the Standard Corporate Protocol (SCP) bus. When the LCM receives this message it will illuminate the indicator on the stability/traction control switch by applying voltage to circuit 961 (WH/PK).

The LED on the switch will also illuminate for 3 seconds when the ignition key is turned to the RUN position. This is to verify (prove out) that the LED and the related circuits are working.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- LCM
- IC

PINPOINT TEST J: THE LED ON THE STABILITY/TRACTION CONTROL SWITCH IS ALWAYS ILLUMINATED

NOTICE: The Flex Probe Kit must be used for all test connections. Use of standard multi-meter probes may damage wiring terminals.

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J1 CHECK FOR DTCs


- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - All Continuous Memory Diagnostic Trouble Codes (CMDTCs).
- Are any DTCs present in the LCM or PCM?

Yes
For PCM DTCs, REFER to Computers and Control Systems.

For LCM DTCs, REFER to the Master DTC Chart in Multifunction Electronic Modules Testing and Inspection.

No
GO to J2.

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J2 CHECK THE TRACTION CONTROL OFF INDICATOR (TRAC OFF) ACTIVE COMMAND


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - LCM.
- Toggle the TRAC OFF active command OFF.
- Does the traction control switch indicator turn OFF?

Yes
GO to J3.

No
GO to J4.

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J3 CHECK THE TRACTION CONTROL SWITCH STATUS (TCSW) PID


- Enter the following diagnostic mode on the scan tool: DataLogger - LCM.
- Monitor the TCSW PID while pressing and releasing the traction control switch.
- Does the PID agree with the switch position?

Yes
GO to J5.

No
GO to Pinpoint Test I. Pinpoint Test I: The Engine Only Traction Control (EOTC) System Cannot be Disabled

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J4 CHECK THE SWITCH INDICATOR CIRCUIT FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: LCM C2145A.
- Ignition ON.
- Does the switch indicator continue to illuminate?

Yes
REPAIR circuit 961 (WH/PK). CLEAR the DTCs. TEST the system for normal operation.

No
GO to J5.

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J5 CHECK FOR CORRECT LCM OPERATION


- Ignition OFF.
- Disconnect all the LCM connectors.
- Check for:

- corrosion.
- pushed-out pins.
- spread terminals.
- Connect all the LCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new LCM. REFER to Multifunction Electronic Modules Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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