The ignition voltage circuit supplies 12 volts to the traction control switch. The electronic brake control module (EBCM) turns OFF the instrument panel (I/P) Traction OFF indicator by applying ground to the service traction control signal circuit.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References

1. Turn OFF the ignition for 5 seconds.
2. Turn ON the ignition while observing the traction off indicator.

⇒	If the traction off indicator stays illuminated after 3 seconds go to Traction Off Indicator Always On circuit system testing.

⇒	If the traction off indicator never illuminates go to Traction Off Indicator Inoperative circuit system testing.

The contacts within the traction control switch may intermittently fail. Press and release the traction control switch while observing the scan tool Traction Control Enabled status to verify a change in the status of the Traction Control Enabled parameter.

Important: Diagnose all vehicle DTCS before using this diagnostic.

1. With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel lamps ON. Verify traction off lamp turns ON.

⇒	If the traction off lamp does not turn ON, replace the instrument panel cluster (IPC).

2. Ignition OFF, disconnect traction control switch connector. Ignition ON, measure for 10-13 volts between traction control indicator control circuit and ground.

⇒	If under 10 volts test for short to ground, short to voltage, open or high resistance.

⇒	If circuits test normal, replace the EBCM.

3. Ignition ON, measure for 10-13 volts between traction control indicator signal circuit and traction control switch ground at switch connector.

⇒	If under 10 volts test for open or high resistance in traction control switch ground circuit.

⇒	If the circuit tests normal, replace the traction control switch.

Important: Diagnose all vehicle DTCS before using this diagnostic.

With the scan tool, select instrument panel special functions Lamp Test, command the instrument panel lamps off.

Disconnect traction control switch connector. Connect a DMM between terminals of switch. Press switch and verify there is continuity.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. Turn OFF the ignition for 5 seconds.
2. Turn ON the ignition, while observing the traction off indicator light.
3. Does the traction off indicator light illuminate for 3 seconds then turn OFF.

⇒	If the traction off indicator light does not light, check that the scan tool traction off lamp command displays ON. If yes, replace the EBCM.

⇒	If no, test the service traction control switch signal circuit terminal for an open or a short to voltage.

⇒	If the circuit tests normal, replace the traction control switch.

1. Turn OFF the ignition for 5 seconds.
2. Turn on the ignition, press and release the traction control switch several times.
3. Observe the scan tool traction enabled status change when the switch is pressed.

⇒	If the traction control enabled status changes, replace the EBCM.

⇒	If the status does not change, check the traction control switch signal circuit terminal for a open or a short to voltage.