Circuit 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0827 Traction Control System Off Indicator Circuit Low
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 TCS requested indicator control circuit when the LED is switched ON.
Action Taken When the DTC Sets
The BCM sets 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 or when the Conditions for Running the DTC are not being met. Use a scan tool to clear the DTC from History status.
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.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics and Body Control System Schematics in Computer/Integrating Systems Connector End View Reference: Antilock Brake System Connector End Views and Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
Does DTC B0828 set? | Go to Step 6 | Go to Step 4 | |
4 | Test the traction control switch (TCS) requested indicator control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 5 |
5 | Replace the body control module (BCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 7 | -- |
6 | Replace the traction control switch. Refer to Accessory Switch Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 3 | System OK |
