Circuit Description
The traction control switch is a momentary-contact, normally-open switch that can be used to disable the traction control system (TCS). Each time the traction control switch is pressed, the TCS enabled/disabled status changes. When TCS is disabled, the electronic brake control module (EBCM) illuminates the traction off indicator by opening the service traction control signal circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2745 Traction Control Switch Circuit
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The EBCM detects low voltage on the traction control switch signal circuit for 10 seconds.
Action Taken When the DTC Sets
The EBCM defaults the traction control system status to Enabled.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Does the DTC set? | Go to Step 4 | Go to Step 6 |
4 |
Did you find and correct the condition? | Go to Step 7 | Go to Step 5 |
5 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 7 | -- |
6 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 3 | System OK |
