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. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Use the scan tool to check the normal state of the Traction Control and Active Handling indicator control.
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Ensures that the instrument cluster can operate the Traction Control and Active Handling indicator.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views or Instrument Panel, Gages, and Console Connector End Views | |||
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | |
Does the scan tool display Off? | Go to Step 3 | Go to Step 4 | |
Does the Traction Control and Active Handling indicator illuminate during the bulb check and then turn OFF? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 5 | |
4 | Inspect for poor connections at the harness connector of the EBCM. 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 8 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the instrument cluster (IPC). 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 8 | Go to Step 7 |
6 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | Go to Step 8 | -- |
7 | Replace the instrument cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Did you complete the repair? | Go to Step 8 | -- |
8 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
