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 number below refers to the step number on the diagnostic table:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
Did the TRAC OFF indicator turn ON then turn OFF? | -- | Go to Step 3 | Go to Step 7 | |
3 |
Is the resistance within the specified range? | 5-15 ohms | Go to Step 6 | Go to Step 4 |
4 |
Is the resistance less than the specified value? | 5 ohms | Go to Step 5 | Go to Step 8 |
5 | Measure the resistance between the traction control switch connector terminal A and a good ground. Is the resistance less than the specified value? | 5 ohms | Go to Step 9 | Go to Step 10 |
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? | -- | -- | |
8 | Repair the open in CKT 1571. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | -- | |
9 | Replace the traction control switch. Refer to Shift Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt. Is the repair complete? | -- | -- | |
10 | Repair the open in CKT 351. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | -- |
