Circuit Description

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The 5 inputs to the EBCM which are used solely for vehicle stability enhancement are the longitudinal accelerometer, lateral accelerometer, yaw rate sensor, master cylinder pressure sensor and the steering wheel position PWM inputs. The EBCM must detect valid inputs from all 5 sources during the initialization period in order to enable the VSES. Initialization must occur during the first 3000 meters of vehicle travel or 1000 meters of straight vehicle travel. If initialization cannot be achieved during this time period, the VSES remains inactive and the message center displays the Stability System Disabled message. The EBCM does not attempt to reinitialize until the next ignition cycle.

During aggressive driving conditions which repeatedly activate the VSES, one or more of the solenoid coils may become overheated. The message center may display the Stability System Limited message at this time as the EBCM reduces VSES activation in an attempt to decrease the solenoid temperatures. If the temperature of any of the solenoids exceeds 275°C (527°F), the message center displays the Stability System Disabled message and the VSES becomes inactive. 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 Disabled message turns OFF and VSES activity resumes when the EBCM determines the solenoids have cooled sufficiently.