B2745

DTC B2745

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle

* Review Strategy Based Diagnosis Strategy Based Diagnosis

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions

DTC Descriptor

DTC B2745 02

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Traction Control Switch Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

When the traction control switch is pressed once, the signal circuit from the BCM is pulled low indicating the stabilitrak competitive mode is commanded. In response to this signal, the BCM sends a serial data message to the electronic brake control module (EBCM) commanding it to disable the traction control system.

When the traction control switch is pressed and held for more than 20 seconds, the BCM sends a serial data message to the EBCM commanding it to disable the stability control. After the EBCM disables the stability control, it sends a serial data message to the instrument cluster requesting it to turn ON the traction/stability control indicator light.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The BCM detects a short to ground on the signal circuit.

Action Taken When the DTC Sets

The BCM ignores the traction control switch signal input.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Reference Information

Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

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 Verification

Observe the scan tool BCM Inputs, Traction Control Switch parameter while pressing the traction control switch. The reading should change between Inactive and Active.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the radio/HVAC control.

2. Test for less than 5 ohms between the ground circuit terminal 16 and ground.

• If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool BCM Inputs, Traction Control Switch parameter is Inactive.

• If not the specified value, test the signal circuit terminal 14 for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3 A fused jumper wire between the signal circuit terminal 14 and ground.

5. Verify the scan tool Traction Control Switch parameter is Active.

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

6. If all circuits test normal, test or replace the radio/HVAC control.

Repair Instructions

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

Control Module References Control Module References for BCM, radio/HVAC replacement, programming and setup