The CMBS is operated by the adaptive cruise control (ACC) unit. The CMBS has the fllowing functions:

The system determines the potential for collision by the distance from the vehicle ahead and the relative speed based on the millimeter wave radar and the predictable course calculated by the driving conditions (output shaft speed sensor and yaw rate-lateral acceleration).

When there is a high risk of collision, the system sends warning directions to the gauge control module and warns by both audible and visual means.

When there is a high risk of collision, the system sends brake directions to the VSA modulator-control unit and controls braking action.