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.
• | The ignition is ON. |
• | The BCM is commanding the traction control switch LED ON. |
The BCM detects low voltage on the TCS requested indicator control circuit when the LED is switched ON.
The BCM sets DTC B0827 as a current DTC for as long as the condition is present.
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.
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.
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 Body Control System Connector End View Reference: Antilock Brake System Connector End Views and Body Control System Connector End Views in Body Control System | |||
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | |
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 |
Important: Perform the setup procedure for the body control module (BCM). Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems. 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 |