Circuit Description
The instrument cluster controls the operation of the TRAC OFF indicator. The EBCM/EBTCM receives a traction control input when the traction control switch is pressed. The EBCM/EBTCM disables the TCS then sends a serial data class 2 message to the instrument cluster to turn the TRAC OFF indicator ON. Each time the ignition switch is cycled from the OFF to the RUN position, the TCS is enabled until the traction control switch is pressed.
Diagnostic Aids
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation. |
| • | If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for a short to ground in the traction control switch or the circuit.
-
This step tests if the instrument cluster has the ability to control the indicator.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Does the switch status change from pressed to released as the traction control switch is pressed and released? | -- | Go to Step 5 | Go to Step 3 |
Is the resistance equal to the specified value? | OL (infinite) | Go to Step 6 | Go to Step 4 | |
4 |
Is the circuit repair complete? | -- | -- | |
Did the indicator turn OFF? | -- | Go to Step 6 | Go to Step 7 | |
6 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- | |
7 | Suspect the instrument cluster. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console. Is the diagnosis complete? | -- | -- |
