Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit/System Description
The Traction Control indicator is controlled by the instrument cluster via serial data messages from the electronic brake control module (EBCM). When the traction control system (TCS) is active for 0.5 seconds, the EBCM commands the instrument cluster to flash the traction control indicator.
The electronic brake control module (EBCM) sends a serial data message to the instrument panel cluster (IPC) to illuminate the TCS indicator when the EBCM has disabled the TCS system (TCS) due to a DTC. The TCS indicator will also turn ON during the instrument cluster bulb check. When the ignition switch is turned to ON, the TCS indicator will turn ON for approximately 3 seconds and then turn OFF.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Turn OFF the ignition for 5 seconds.
- Turn ON the ignition, with a scan tool, select instrument panel special functions Display Test. Command the instrument panel lamps ON. Verify the Traction Control indicator lamp illuminates for at least 2 seconds and then turns OFF.
Circuit/System Testing
Important: Diagnose all vehicle DTCs before using this diagnostic.
The malfunction must be present during diagnosis in order to prevent unnecessary parts replacement.- Ignition OFF for 5 seconds, ignition ON, observe that the traction control indicator functions by illuminating for 2 seconds then turns OFF.
| ⇒ | If the traction control indicator does not illuminate, with the scan tool, select instrument panel special functions Display Test. Command the instrument panel lamps ON and OFF. Verify the TCS lamp turns ON and OFF. |
| ⇒ | If the TCS warning lamp does not turn OFF, replace the IPC. |
| ⇒ | If the TCS warning lamp does turn OFF, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM or IPC replacement, setup, and programming
Repair Verification
Ignition OFF for 5 seconds, ignition ON, observe that the traction control indicator functions by illuminating for 2 seconds then turns OFF. This is the bulb self test that operates upon every ignition key start cycle.
