Circuit Description
The traction control switch is a momentary switch. The signal circuit of the traction control switch is grounded, when the driver presses the traction control switch. The traction control system will change state from traction on to traction off, or from traction off to traction on, each time the traction control switch is pressed.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2747 Traction Control Switch Circuit Low
Conditions for Running the DTC
| • | The battery voltage is between 9-16 volts. |
| • | The park brake is not applied. |
Conditions for Setting the DTC
| • | The signal circuit voltage of the traction control switch is no more than 2 volts. |
| • | All of the above conditions are present for greater than 60 seconds. |
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The body control module (BCM) stores DTC B2747 in memory. |
| • | The traction control switch input is ignored until the fault is no longer current. |
Conditions for Clearing the DTC
| • | A current DTC B2747 will clear if the BCM no longer detects a short to ground for longer than 60 seconds. |
| • | A history DTC B2747 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | A scan tool may be used to clear the DTC. |
Diagnostic Aids
Check for a traction control switch that may be sticking in the pressed position. For an intermittent condition refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views or Computer/Integrating Systems Connector End Views in Computer/Intergrating Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool display Active? | Go to Step 3 | Go to Diagnostic Aids | |
Does the scan tool display Inactive? | Go to Step 6 | Go to Step 4 | |
4 | Test the traction control switch input/signal 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 9 | Go to Step 5 |
5 | Inspect for poor connections at the harness connector of the 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 9 | Go to Step 7 |
6 | 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 in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | 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 9 | -- |
8 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
