B2745

DTC B2745

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC B2745 00
- Traction Control Switch Circuit

Diagnostic Fault Information






Circuit/System Description

The driver may disable the Traction Control System (TCS) by pressing the traction control switch. The body control module (BCM) supplies a 12 V signal on the traction control signal circuit. When the traction control switch is pressed, this voltage signal is grounded.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The BCM detects low voltage on the traction control signal circuit for 60 seconds.

Action Taken When the DTC Sets

* The BCM sends a serial data message to the electronic brake control module (EBCM) informing the EBCM that the desired TCS state cannot be determined.
* The EBCM defaults the TCS status to enabled.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Reference Information
Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

ABS Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate control switch.
2. Test for less than 5 ohm between the ground circuit terminal listed below and ground.

* Traction Control Switch terminal A (with NP1)
* I/P Multifunction Switch terminal H (without NP1)

3. Ignition ON, verify the scan tool BCM TCS Switch State parameter is Released.

• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit test normal replace the BCM.

* Traction Control Switch terminal C (with NP1)
* I/P Multifunction Switch terminal J (without NP1)

4. Install a 3A fused jumper wire between the terminals listed below. Verify the scan tool BCM TCS Switch State parameter is Pressed.

* Traction Control Switch signal circuit terminal C and ground circuit terminal A (with NP1).
* I/P Multifunction Switch signal circuit terminal J and ground circuit terminal H (without NP1).

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit test normal replace the BCM.

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

Component Testing

Traction Control Switch (With NP1)
1. Ignition OFF, disconnect the harness connector at the traction control switch.
2. Test for infinite resistance between the signal terminal C and the ground terminal A with the switch in the open position.

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

3. Test for less than 3 ohm between the signal terminal C and the ground terminal A with the switch in the closed position.

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

I/P Multifunction Switch (Without NP1)
1. Ignition OFF, disconnect the harness connector at the I/P multifunction control switch.
2. Test for infinite resistance between the signal terminal J and the ground terminal H with the switch in the open position.

• If not the specified value, replace the I/P multifunction control switch.

3. Test for less than 3 ohm between the signal terminal J and the ground terminal H with the switch in the closed position.

• If greater than the specified range, replace the I/P multifunction control switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Electronic Traction Control Switch Replacement Service and Repair
* Accessory Switch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming.