Circuit Description
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The Variable Effort Steering (VES) system uses the Electronic Brake Control Module (EBCM) to control current to a bi-directional electromagnetic rotary actuator. The VES system also uses the ABS wheel speed sensor inputs to determine vehicle speed. The EBCM commands current from negative two amps to positive three amps to the VES actuator. At low speeds, a negative current is commanded, which assists steering. At medium speeds, no current is commanded and steering is assisted by hydraulics only. At high speeds, a positive current is commanded, which creates steering resistance.