Stability System Disabled Indicator Always On
Stability System Disabled Indicator Always On
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit Description
The stability system disable indicator is controlled by the instrument cluster via class 2 serial data messages from the electronic brake control module (EBCM). When the instrument cluster sees a class 2 message from the EBCM that tells the instrument panel cluster (IPC) that the stability system is malfunctioning, the EBCM then disables vehicle stability enhancement system (VSES) and traction control system (TCS) and sends a message to the instrument cluster to turn the stability system disable indicator always on and TCS indicators ON. Each time the ignition is cycled from OFF to ON, the VSES is enabled:
The following conditions will cause the VSES/TCS indicators to illuminate:
* The EBCM has disabled the VSES/TCS due to a DTC.
* The instrument cluster bulb check-When the ignition switch is turned to ON, the VSES/TCS indicators will turn ON for approximately 3 seconds and then turn OFF.
Reference Information
Schematic Reference
Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
ABS Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for EBCM and IPC
Circuit/System Verification
Verify the scan tool ABS, TCS, and Low Traction Warning Lamp Indicators parameter in the ABS/TCS/MSVA/VSES data list. The scan tool value displayed should be 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 Inspect the EBCM ground, ensuring the ground is clean and torqued to the proper specification.
1. Ignition OFF for 5 seconds, Igniton ON, observe that the traction off indicator functions by illuminating for 3 seconds then turns OFF.
• If the ABS, TCS, or Low Traction indicators do not illuminate, with the scan tool, select instrument panel special functions Display Test. Command the instrument panel lamps ON and OFF. Verify the Warning indicator lamps turn ON and OFF.
• If the warning lamps do not turn OFF, replace the IPC.
• If the warning lamps do turn OFF, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for EBCM or IPC replacement, setup, and programming
Repair Validation
Ignition OFF for 5 seconds, Igniton ON, observe that the ABS, TCS, and Low Traction indicators function by illuminating for 3 seconds then turns OFF. This is the bulb self test that operates upon every ignition key start cycle.