Integrated Chassis Control System

The ICCS1 system combines wheel speeds and steering angle information to achieve greater control of the vehicle during an ABS event. The EBTCM uses information from the Wheel Speed Sensors and the Steering Wheel Position Sensor to accomplish this. ICCS1 is standard on the SLS. The ICCS2 system includes an additional level of control to the EBTCM with suspension information provided by He CVRSS. The ICCS2 system improves the sensitivity of the ABS, TCS and CVRSS systems, and adds one new system, Stabilitrak. The Stabilitrak system monitors the wheel speeds, lateral acceleration and steering sensor inputs to calculate a desired yaw rate, and compare it to the actual yaw rate reported by the Yaw Rate Sensor. Steering maneuvers can cause the desired yaw rate to differ from the reported yaw rate by some amount. This difference can result from tire compliance, suspension compliance, and wheel slip. The Stabilitrak system tries to bring these yaw rates into agreement by selectively applying the front wheel brakes. If wheel slip rates are excessive, traction control may activate to reduce power. To achieve this higher level of control in ICCS2, two new sensors are added.
- Lateral Accelerometer measures the vehicle's acceleration perpendicular to the longitudinal (fore/aft) axis.
- Yaw Rate Sensor measures the yaw (angular rate about a vertical axis) rate of the vehicle.

Dedicated data lines and Class 2 data lines transmit information from these sensors to the EBTCM, PCM and the suspension controller. ICCS2 is standard on the STS, ETC and Concours models.