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DTC B2745

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 Ground

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Traction Control Switch Signal

B2745 02

1

1

--

Traction Control Switch Ground

--

1

--

--

1. Traction Control Switch Inoperative

Circuit/System Description

The body control module (BCM) monitors the traction control switch. When the traction control switch is pressed once, the BCM will request the electronic brake control module (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 traction control off and 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

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

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, disconnect the harness connector at the S75 Traction Control Switch.
  2. Test for less than 5 Ω between the ground circuit terminal 4 and ground.
    3. [ARW-LISTFAIL]

  3. If greater than 5 Ω

    Repair the open/high resistance in the circuit.

    4. [/ARW-LISTFAIL][ARW-LISTPASS]

  4. If less than 5 Ω

    5. [/ARW-LISTPASS]
  5. Ignition ON, verify the scan tool BCM Traction Control Switch parameter is Inactive.
    6. [ARW-LISTFAIL]

  6. If the parameter is Active

    7. [/ARW-LISTFAIL]
    3.1. Ignition OFF, disconnect the X2 harness connector at the K9 BCM.
    3.2. Test for infinite resistance between the signal circuit terminal 2 at the S75 Traction Control Switch and earth.
    [ARW-LISTFAIL]

  7. If less than infinite resistance, repair the short to ground on the circuit.

  8. If infinite resistance, replace the K9 Body Control Module.

    9. [/ARW-LISTFAIL] [ARW-LISTPASS]

  9. If the parameter is Inactive

    10. [/ARW-LISTPASS]
  10. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
  11. Verify the scan tool BCM Traction Control Switch parameter is Active.
    12. [ARW-LISTFAIL]

  12. If the parameter is Inactive

    13. [/ARW-LISTFAIL]
    5.1. Ignition OFF.
    5.2. Disconnect the X2 harness connector at the K9 Body Control Module, ignition ON
    5.3. Test for less than 0.3 V the signal circuit and ground.
    [ARW-LISTFAIL]

  13. If greater than 0.3 V, repair the short to voltage on the circuit.

    14. [/ARW-LISTFAIL][ARW-LISTPASS]

  14. If less than 0.3 V

    15. [/ARW-LISTPASS]
    5.4. Ignition OFF.
    5.5. Test for less than 2 Ω in the signal circuit end to end.
    [ARW-LISTFAIL]

  15. If 2 Ω or greater, repair the open/high resistance in the circuit.

  16. If less than 2 Ω, replace the K9 Body Control Module.

    17. [/ARW-LISTFAIL] [ARW-LISTPASS]

  17. If the parameter is Active

    18. [/ARW-LISTPASS]
  18. Replace the S75 Traction Control Switch.

Component Testing

Static Test

  1. Ignition OFF, disconnect the harness connector at the S75 Traction Control Switch.
  2. Test for infinite resistance between the signal circuit terminal 2 and the ground circuit terminal 4 with the switch in the released position.
    3. [ARW-LISTFAIL]

  3. If less than infinite resistance

    Replace the S75 Traction Control Switch.

    4. [/ARW-LISTFAIL][ARW-LISTPASS]

  4. If infinite resistance

    5. [/ARW-LISTPASS]
  5. Test for less than 5 Ω between the signal circuit terminal 2 and the ground circuit terminal 4 with the switch in the pressed position.
    6. [ARW-LISTFAIL]

  6. If greater than 5 Ω

    Replace the S75 Traction Control Switch.

    7. [/ARW-LISTFAIL][ARW-LISTPASS]

  7. If greater than 5 Ω

    8. [/ARW-LISTPASS]
  8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM replacement, programming and setup

   


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