Stability System Caution Indicator Always On
Stability System Caution Indicator Always On
Circuit Description
The instrument panel cluster (IPC) illuminates the stability system caution indicator during the IPC bulb check or when the electronic brake control module (EBCM) sends a serial data message to the IPC commanding the indicator ON. The stability system caution indicator is used to indicate when the vehicle stability enhancement system (VSES) is disabled.
During aggressive driving conditions which repeatedly activate the VSES or traction control system (TCS), one or more of the solenoid coils may become overheated. The stability system caution indicator is displayed at this time and the EBCM disables all VSES/TCS brake pressure applications in an attempt to decrease the solenoid temperatures. Coil temperatures are estimated by the EBCM based on ambient temperature and monitored solenoid activation and may not coincide with actual solenoid temperatures. The stability system caution indicator turns OFF and normal VSES/TCS activity resumes when the EBCM determines that the solenoids have cooled sufficiently.
Diagnostic Aids
The VSES solenoid coils may overheat during aggressive driving, causing the VSES to be disabled temporarily.
A medium-low brake fluid level in the master cylinder reservoir may cause the stability system caution indicator to be illuminated during stopping or turning maneuvers. This condition will also cause the red brake warning indicator to turn ON. Ensure the master cylinder reservoir has an adequate brake fluid level.
If the stability system caution indicator turns ON due to any of the above conditions, no diagnosis or repair of the VSES is required.
