B2597

DTC B2597





Circuit Description
The Traction Control and Active Handling indicator is controlled by the instrument cluster via serial data messages from the EBCM. When the BCM sees the traction control switch input grounded through the momentary traction control switch, it sends a serial data message to the EBCM that tells the EBCM that the traction control switch has been pressed. The EBCM then disables TCS and VSES (w/JL4). The EBCM sends a serial data message to the instrument cluster to turn the Traction Control and Active Handling indicator ON and display the Traction System Off message or the Traction/Active Handling Off message (w/JL4) on the DIC.
With JL4, when the BCM sees the traction control switch input grounded for 5 seconds while the vehicle is stopped and the ignition is ON, it sends a serial data message to the EBCM that tells the EBCM that the traction control switch has been pressed for 5 seconds. The EBCM then disables TCS, while leaving VSES enabled. The EBCM sends a serial data message to the instrument cluster display the Competitive Driving message on the DIC. The Traction Control and Active Handling indicator remains OFF.
Each time the ignition is cycled from OFF to ON, the TCS and VSES (w/JL4) are enabled.
The following conditions will cause the Traction Control and Active Handling indicator to illuminate:
^ The EBCM has disabled the TCS or VSES due to a DTC.
^ The driver manually disabling the TCS or VSES via the traction control switch.
^ The instrument cluster bulb check. When the ignition switch is turned to ON, the Traction Control and Active Handling indicator will turn on for approximately 3 seconds and then turn OFF.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
The BCM detects a ground on the traction control switch signal circuit for longer than 60 seconds.

Action Taken When the DTC Sets
^ The ABS remains functional.
^ The ABS indicator remains OFF.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
^ The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.
^ The BCM automatically clears the history DTC when a current DTC is not detected in 50 consecutive ignition cycles.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests for the normal state of the TCS switch using a scan tool.
3. Tests if the BCM is able to detect a change in TCS switch state.
4. Tests for a stuck or shorted TCS switch. If the TCS switch is stuck or shorted, the state will change from On to Off when the TCS switch is disconnected.
5. Tests for a short to ground in the TCS switch signal circuit.
8. When the BCM is replaced, use a scan tool to perform the setup procedure for the BCM.