B0827

DTC B0827

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC B0827
- Traction Control Switch Off Indicator Circuit Low

Diagnostic Fault Information





Circuit/System Description

After the traction control switch (TCS) is pressed and released, the LED on the switch illuminates. The body control module (BCM) illuminates the LED by supplying adequate current to the high side of the LED.

Conditions for Running the DTC

* The ignition is ON.
* The body control module (BCM) is commanding the traction control switch LED ON.

Conditions for Setting the DTC

The BCM detects low voltage on the traction control requested indicator control circuit when the LED is switched ON.

Action Taken When the DTC Sets

* The BCM sets a DTC.
* B0827 as a current DTC for as long as the condition is present.

Conditions for Clearing the DTC

The DTC clears automatically from Current status when the fault is corrected.

Diagnostic Aids

An intermittent short to ground on the TCS requested indicator control circuit is the most likely cause of a history DTC when no problem is found. When the conditions for setting this DTC are present, the traction control switch LED cannot illuminate.

Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Circuit/System Verification

Traction control can be disabled/enabled when the traction control switch is pressed and released.

Circuit/System Testing

1. Turn OFF the ignition for 5 seconds, then turn ON the ignition and wait at least 60 seconds.

• If DTC B0827 does not reset, go to Diagnostic Aids

2. Turn the ignition OFF. Disconnect the traction control switch harness connector. Turn the ignition ON and wait at least 60 seconds.

• If DTC B0827 does not reset, replace the traction control switch.
• If the DTC B0827 resets, check the TCS switch requested indicator control circuit for a short to ground.

3. If the circuit test normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Accessory Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming.