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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 00: Traction Control Switch Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Signal

--

1

B2745

--

Ground

--

1

--

--

1. Traction Control Switch Malfunction

Circuit/System Description

The traction control system switch is a normally open switch that closes when the switch is activated. When activated, the switch grounds the traction control system signal circuit. The body control module (BCM) converts the signal into serial data, which is used by the electronic brake control module (EBCM) to enable/disable the traction control system.

Conditions for Running the DTC

    • Ignition ON.
    • Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

The BCM detects the traction control system switch is activated for 60 seconds or more.

Action Taken When the DTC Sets

    • The EBCM disables the ABS/traction control system/vehicle stability enhancement system for the duration of the ignition cycle.
    • A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

    • The conditions for setting the DTC are 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

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

  1. Ignition ON, with a scan tool command the IPC display test ON and OFF. The Stabilitrak indicator should turn ON and OFF.
  2. If the indicator does not turn ON and OFF, replace the P16 Instrument Cluster.
  3. 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 S48A Multi-Function Switch Instrument Panel or the S48D Multi-Function Switch 2 Instrument Panel.
  2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal listed below and ground.
  3. • Terminal 2 (S48D Multi-Function Switch 2 Instrument Panel)
    •  Terminal 16 (S48A Multi-Function Switch Instrument Panel)
    If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool Traction Control Switch parameter is Inactive.
  5. If not the specified value, test the appropriate signal circuit for a short to ground.
  6. Install a 3A fused jumper wire between the appropriate signal circuit terminal and the ground circuit terminal listed below. Verify the scan tool Traction Control Switch parameter is Active.
  7. • Signal Terminal 1 and Ground Terminal 2 (S48D Multi-Function Switch 2 Instrument Panel)
    • Signal Terminal 5 and Ground Terminal 16 (S48A Multi-Function Switch Instrument Panel)
    If not the specified value, test the signal circuit for a short to voltage or an open/high resistance.
  8. If all circuits test normal, test or replace the traction control switch. If the DTC resets, replace the K9 Body Control Module (BCM).

Component Testing

  1. Ignition OFF, disconnect the harness connector at the S48A Multi-Function Switch Instrument Panel or the S48D Multi-Function Switch 2 Instrument Panel.
  2. Test for infinite resistance between the appropriate signal terminal and the ground terminal listed below with the switch in the open position.
  3. • Signal Terminal 1 and Ground Terminal 2 (S48D Multi-Function Switch 2 Instrument Panel)
    • Signal Terminal 5 and Ground Terminal 16 (S48A Multi-Function Switch Instrument Panel)
    If not the specified value, replace the S48A Multi-Function Switch Instrument Panel or the S48D Multi-Function Switch 2 Instrument Panel.
  4. Test for less than 3 Ω between the appropriate signal terminal and the ground terminal listed below with the switch in the closed position.
  5. • Signal Terminal 1 and Ground Terminal 2 (S48D Multi-Function Switch 2 Instrument Panel)
    • Signal Terminal 5 and Ground Terminal 16 (S48A Multi-Function Switch Instrument Panel)
    If greater than the specified range, replace the S48A Multi-Function Switch Instrument Panel or the S48D Multi-Function Switch 2 Instrument Panel.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Front Floor Console Accessory Trim Plate Replacement : Short Body Upper → Long Body Upper → Lower
    • Control Module References for BCM or Instrument Cluster replacement, programming and setup
   


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