Vehicle Stability Enhancement System (VSES)

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The Vehicle Stability Enhancement System (VSES) is also known as the Stabilitrak Plus system, and the instrument cluster indicator lamp is labeled Stability Off. The VSES consists of a yaw/lateral accelerometer sensor, a steering angle sensor, and a brake pressure sensor working in conjunction with the EBCM.

The yaw rate sensor and lateral accelerometer sensor are both in the same module and use a reference voltage of 5 volts. The lateral accelerometer sensor operating range is 1.5 g resulting in an output range of 2.5-4.75 volts. The yaw rate sensor range is 75 degrees/seconds, resulting in a signal proportional output of 0.25-4.75 volts. Zero yaw rate is 2.5 volts. The yaw/lateral accelerometer sensor is located inside the center console, between the automatic transaxle gear selector and the console storage compartment.

The steering angle sensor sends dual CAN signals to the EBCM. The EBCM determines steering wheel position and rotation using these signals. The steering angle sensor is located in the lower left hand side of the I/P, on the bottom of the steering column.

The brake pressure sensor uses a reference voltage of 5 volts. The sensor operating range is 0.25-4.75 volts. The EBCM uses input from the brake pressure sensor for more accurate control during a VSES event.