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 02: Traction Control Switch Circuit Short to GroundDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
TCS Switch Signal | B2745 02 | 1 | -- | -- |
Ground | -- | 1 | 1 | -- |
1. Traction Control Indicator Malfunction | ||||
Circuit/System Description
The driver may disable the traction control system (TCS) by pressing the traction control switch. The body control module (BCM) detects the signal circuit is grounded and sends a serial data message to the electronic brake control module (EBCM) to disable traction control, and the instrument panel cluster (IPC) to illuminate the indicator.
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 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 DTC clears when the condition is no longer present.
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 Verification
Ignition ON, 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
- Ignition OFF, disconnect the harness connector at the traction control switch.
- Test for less than 5 ohms between the ground circuit terminal 2 and ground.
- Ignition ON, verify the scan tool Traction Control Switch parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2. Verify the scan tool Traction Control Switch parameter is Active.
- If all circuits test normal, test or replace the traction control switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the traction control switch.
- Test for infinite resistance between the signal terminal 1 and the ground terminal 2 with the switch in the open position.
- Test for less than 3 ohms between the signal terminal 1 and the ground terminal 2 with the switch in the closed position.
| ⇒ | If not the specified value, replace the traction control switch. |
| ⇒ | If greater than the specified range, replace the traction control switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
