For 1990-2009 cars

### 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 Connector End View Reference: Antilock Brake System Connector End Views and Data Communication Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Turn OFF the ignition for 5 seconds.
2. Turn ON the ignition.

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 . Did you find and correct the condition? | Go to Step 11 | Go to Step 8
5 |

1. Turn OFF the ignition.
2. Remove the instrument panel center trim bezel to access the traction control switch harness connector.
3. Disconnect the traction control switch harness connector.
4. Use a fused jumper wire to connect the TCS requested indicator control circuit to the traction control switch ground circuit.
5. Turn ON the ignition.

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 . 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 . Did you find and correct the condition? | Go to Step 11 | Go to Step 8
8 | Replace the BCM. Refer to Control Module References 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 . Did you find and correct the condition? | Go to Step 11 | Go to Step 10
10 | Replace the TCS. Refer to Accessory Switch Replacement . Did you complete the replacement? | Go to Step 11 | --
11 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

Go to Step 3

System OK