ICM control unit
Sensors that were previously housed in other components are installed in the ICM control unit (depending on the configuration). The ICM control unit uses these sensors to calculate variables that are important for the dynamic handling characteristics of the vehicle:
New : The airbag sensors are integrated in the ICM control unit. This means that networking of passive and active safety has been implemented. The ACSM control unit ensures that the sensors are provided with a voltage supply.
The following sensors can be installed:
- Longitudinal acceleration sensor (maximum of 3)
- Lateral acceleration sensor (maximum 3 pieces)
- Vertical acceleration sensor
- Rotation-rate sensor
- Pitch rate sensor
- Yaw rate sensor
Initially, the sensor signals are related to the sensor housing. However, the driving stability control needs these variables related to the co-ordinate system of the vehicle. The ICM control unit performs the necessary conversion. The correction values necessary for this are determined by an adjustment during commissioning of the ICM control unit.
An adjustment of the integrated sensors is necessary after the ICM control unit has been replaced. The adjustment must take place while the vehicle is on a subsurface that is horizontal in longitudinal direction and transverse direction. Terminal 15 must be switched on.
Attention!
The ICM control unit may therefore only be removed or installed if the battery has been disconnected. The airbag control unit uses the sensor system in the ICM control unit to deploy the airbag. Otherwise there is a risk of unintentional airbag deployment!
| Item | Explanation |
|---|---|
| 1 | Integrated chassis management (ICM) |
| 2 | Plug connection (54-pin) |
The ICM control unit is located in the vicinity of the vehicle's center of gravity.
The control unit is mounted on the transmission tunnel using 4 bolts and spacer sleeves made of aluminum. This mounting must connect the control unit to the vehicle body without play. Otherwise, the housing would vibrate, which would seriously diminish the operating principle of the integrated sensor system. A second task of this mounting is to dissipate heat from the control unit to the body.