Traction Off Indicator Inoperative

Traction Off Indicator Inoperative

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

Circuit/System Description
When the body control module (BCM) sees the traction control switch input grounded through the momentary traction control switch, it sends a serial data message to the electronic brake control module (EBCM) that tells the EBCM that the traction control switch has been pressed. The EBCM then disables traction control and sends a serial data message to the instrument cluster to turn ON the Traction Off indicator on the instrument panel. Each time the ignition is cycled from OFF to ON, the traction control system is enabled.

Reference Information

Schematic Reference
ABS Schematics

Connector End View Reference
ABS Connector End Views

Electrical Information Reference
^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs

Scan Tool Reference
Scan Tool Data List

Circuit/System Testing
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 4.8 - 5.2 volts between traction control switch signal circuit and ground.
^ If under 4.8 volts test for short to ground, open, high resistance or replace BCM.
^ If over 5.2 volts test for short to voltage or replace BCM.

3. Ignition ON, measure for 4.8 - 5.2 volts between traction control switch signal circuit and traction control switch ground at switch connector.
^ If under 4.8 volts test for open or high resistance in traction control switch ground circuit.

4. Replace traction control switch.

Component Testing
Disconnect traction control switch connector. Connect a DMM between terminals of switch. Press switch and verify there is continuity.
^ If there is no continuity replace switch.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for EBCM, IPC, and BCM replacement, setup, and programming