DTC B2745

DTC B2745

Diagnostic Instructions

DTC Descriptor

Diagnostic Fault Information

Circuit/System Description

The instrument cluster illuminates the traction control/stability control active indicator, traction control off indicator and stability control off indicator for 5 s after ignition ON. The electronic brake control module (EBCM) will request the instrument cluster via serial data to turn the traction control/stability control active indicator ON (flashing) when the system is in traction control or stability control mode. When the EBCM detects a fault it sends a serial data message to the instrument cluster commanding the traction control/stability control active indicator ON.

The body control module (BCM) monitors the traction control switch. When the traction control switch is pressed once, the BCM will request the EBCM via serial data to disable the traction control. When the traction control switch is pressed for 5 s, the BCM will request the EBCM to disable the stability control. The EBCM will request the instrument cluster via serial data to turn the stability control off indicator ON to notify the driver of the deactivation.

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

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

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

Circuit/System Testing

1. Ignition OFF, key out, open and close the driver door, wait 30 s, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
2. Test for less than 10 Ω between the ground circuit terminal 2 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 Traction Control Switch parameter is Inactive.

⇒	If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.

4. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground.
5. Verify the scan tool BCM 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 K9 Body Control Module.

6. If all circuits test normal, test or replace the S48C Multifunction Switch 1 - Instrument Panel.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
2. Test for infinite resistance between the signal circuit terminal 4 and the ground circuit terminal 2 with the switch in the released position.

⇒	If less than the specified value, replace the S48C Multifunction Switch 1 - Instrument Panel.

3. Test for less than 5 Ω between the signal circuit terminal 4 and the ground circuit terminal 2 with the switch in the pressed position.

⇒	If greater than the specified value, replace the S48C Multifunction Switch 1 - Instrument Panel.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM, EBCM or instrument cluster replacement, setup and programming