Traction Off Indicator Inoperative

Circuit Description
The TRAC OFF indicator is controlled by the EBCM by sending class 2 messages to the instrument panel cluster (IPC). It is turned on when the EBCM sets a DTC that turns on the TRAC OFF indicator. It is also turned on or off when the traction control switch is pressed. The body control module (BCM) receives the input from the traction control switch, the BCM then sends a class 2 message to the EBCM telling the EBCM the state of the switch. The BCM supplies 12 volts to the TCS switch, when the TCS switch is pressed the BCM sees the voltage go low and sends the EBCM the message that the TCS switch state has changed. When the EBCM receives the message from the BCM that the switch state has changed, the EBCM turns on or off traction control and sends a message to the IPC to turn on or off the TRAC OFF indicator depending on its previous state.

Test Description
The numbers below refer to step numbers on the diagnostic table.
2. Checks if the body control module is receiving a traction control switch input.
3. Checks if the EBTCM is receiving a traction control switch message from the body control module.
9. Checks if the body control module or the traction control switch is at fault.