Circuit Description
When TCS is enabled, the TRAC LED request from the EBTCM to the BCM (circuit 832) is at battery voltage and the BCM grounds circuit 1660. This action turns the TRAC LED ON, indicating that TCS is available.
When the driver disables TCS by depressing the TRAC switch, the EBTCM grounds circuit 832. In response, the BCM turns the LED Off by removing the ground on circuit 1660.
DTC Parameters
DTC B0827 will set:
| • | If the driver presses the TRAC switch with the ignition in run and circuit 1660 is open or shorted to ground. |
| • | If circuit 641 is open. |
Important: The EBTCM does not test circuit 832 for malfunction.
Important: DTC B0827 will not illuminate a telltale.
Two different failure modes can exist when B0827 is set:
| • | If the TRAC LED is OFF, check circuit 641 for open. |
| • | If the TRAC LED is always ON, check circuit 1660 for short to ground. |
Diagnostic Aids
Inspect wiring, components, and connector for the following conditions:
| • | Proper connection |
| • | Backed-out terminals |
| • | Broken connector locks |
| • | Corrosion in connectors/terminals |
| • | Burned, chafed or pinched wires |
| • | Broken wire inside insulation |
| • | Loose components |
Step | Action | Yes | No |
|---|---|---|---|
Connector End View Reference: 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 Traction Switch parameter change state? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the scan tool display Active? | Go to Step 5 | Go to Step 4 |
4 | Test the signal circuit of the traction control switch for an open or high resistance. 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 10 | Go to Step 6 |
5 | Test the ground circuit of the traction control switch for an open or high resistance. Refer to Testing for Continuity in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
6 | Inspect 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 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the traction control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs and in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 10 | -- |
10 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
