For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2745 00: Traction Control Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
TCS switch signal circuit | B2745 | 1 | -- | -- |
Ground | -- | 1 | -- | -- |
1. Traction control cannot be manually disabled. | ||||
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-volt 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
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the traction control switch.
- Ignition ON, verify the scan tool BCM TCS Switch State parameter is Released.
- Install a 3A fused jumper wire between the signal circuit terminal I and the ground circuit terminal H. Verify the scan tool BCM TCS Switch State parameter is Pressed.
- If all circuits test normal, test or replace the traction control switch. If DTC resets replace the BCM.
| ⇒ | If not the specified value, test the signal circuit terminal I for a short to ground. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming. |
