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. The BCM supplies a low current, 12-volt signal to the TCS requested indicator control circuit, when the LED is commanded OFF. The BCM monitors the feedback from this signal to detect opens or shorts to voltage in the LED control circuitry.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0828 Traction Control System Off Indicator Circuit High
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The BCM is commanding the traction control switch LED OFF. |
Conditions for Setting the DTC
The BCM detects high voltage on the LED control circuit when the TCS requested indicator is switched OFF.
Action Taken When the DTC Sets
The BCM sets DTC B0828 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 open or short to voltage 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 may not illuminate when the traction control switch is pressed, or may remain illuminated whenever the ignition is ON.
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 DTC B0828 set as a Current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 | Observe the traction control switch LED. Is the traction control switch LED illuminated? | Go to Step 4 | Go to Step 5 |
4 | Test the traction control switch (TCS) requested indicator control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
5 |
Does the DTC set? | Go to Step 6 | Go to Step 9 |
6 | Test the TCS requested indicator control circuit and the TCS ground circuit for opens. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
7 | Test for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
8 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | -- |
9 | Test for poor connections at the harness connector of the TCS. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
10 | Replace the TCS. Refer to Accessory Switch Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 11 | -- |
11 |
Does the DTC reset? | Go to Step 3 | System OK |
