The ignition 3 voltage circuit supplies 12 volts to the traction control switch. The electronic brake control module (EBCM) illuminates the Traction OFF indicator by applying voltage to the service traction control signal circuit.

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.

Schematic Reference

Air Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for EBCM

Ignition ON, observe the scan tool Traction OFF parameter while pressing/depressing the traction control switch. The reading should change between OFF/ON and ON/OFF traction off switch command value.

1. Ignition OFF, disconnect the Traction OFF harness connector at the traction control switch.
2. Igniton ON, verify that a test lamp illuminates between the EBCM traction control active signal circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the traction control active signal circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 3 circuit breaker is open, test the traction control active signal circuit terminal 1 for a short to ground.

3. Verify the scan tool Traction OFF Command parameter is OFF.

⇒	If not the specified value, test the traction control active signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the EBCM.

4. Install a 3 A fused jumper wire between the traction control active signal circuit terminal 1 and the traction control switch ignition 1 voltage circuit terminal D. Verify the scan tool Traction OFF Command parameter is ON.

⇒	If not the specified value, test the traction control active signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.

5. If all circuits test normal, test or replace the traction control switch.

1. Ignition OFF, disconnect the harness connector at the traction control switch.
2. Test for infinite resistance between the traction control active signal terminal 1 and the low traction indicator control terminal 13 with the switch in the open position.

⇒	If not the specified value, replace the traction control switch.

3. Test for less than 2 ohms between the traction control active signal terminal 1 and the low traction indicator control terminal 13 with the traction off switch in the closed position.

⇒	If greater than the specified range, replace the traction control switch.

4. Test for infinite resistance between each terminal and the traction control switch housing/case.

⇒	If not the specified value, replace the traction control switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. Ignition OFF, wait for 5 seconds
2. Ignition ON, observe the Instrument Panel Cluster Low Traction indicator. The Low Traction Indicator should illuminate for 3 seconds and go OFF.