Circuit Description
The TRAC OFF Indicator is controlled by the EBTCM by sending class 2 messages to the Instrument Panel Cluster (IPC). It is turned on when the EBTCM 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 EBTCM telling the EBTCM 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 EBTCM the message that the TCS switch state has changed. When the EBTCM receives the message from the BCM that the switch state has changed, the EBTCM 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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The TRAC OFF indicator does not turn off after the Instrument Panel Cluster (IPC) bulb check or after the Traction control Switch is pressed to turn the Traction Control on after it was disabled. | ||||
1 | Was the ABS Diagnostic System Check performed? | -- | ||
Using a scan tool in the Instrument Panel Cluster Special Functions attempt to turn off the TRAC OFF indicator. Did the TRAC Off indicator Turn off? | -- | |||
3 | Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the Replacement complete? | -- | -- | |
4 | Replace the Instrument Panel Cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the Replacement complete? | -- | -- | |
