Fail safe
Depending on the type of fault that has occurred, the fail safe takes effect in 3 stages:
- Stage 1: substitute values
If, for example, the steering-angle-sensor signal is unavailable, other variables are used as substitute values for the detection of cornering. The driver does not receive a Check Control message: no fault memory entry.
- Stage 2: constant power supply
The VDM control module specifies a constant damping force that is the same for all 4 wheels (medium-hard damping). The damper satellites set a constant power supply for the EDC valves. A defective height-level sensor, for example, can be the cause. A Check Control message is output to the driver. A fault is entered in the fault memory.
- Stage 3: no power supply
If a fault has occurred in activation of an EDC valve:
The VDM control module indicates to the damper satellites that the EDC valves may no longer be supplied with current. This causes the valve to move to a position that corresponds more to medium to harder damping. A Check Control message is output to the driver. A fault is entered in the fault memory.
| Index | Explanation |
|---|---|
| 1 | Check Control message |