Fault Messages
The EMF and DSC control modules monitor the system for faults and alert the driver. A fault has different priorities depending on driving situations: vehicle stationary/moving and starting off/deceleration. To avoid damage, faults in the EMF actuating mechanism like cable breakage and stretch (actuating range exceeded) are detected by the Hall sensors in the motor.
If the EMF control module is defective, fault messages will not be available. The instrument cluster recognizes the absence of the normally active parking brake message (alive - enable) over the PT-CAN Bus and will display a fault message. The safety concept is based on a staged shut down strategy. In addition to the yellow warning light, information is available in the Control Display.
| Fault | Availability | Availability | Availability | Back-up system |
|---|---|---|---|---|
| Parking brake (mechanically)v=0 | Dynamic braking (hydraulic)v>0 | Automatic hold | ||
| Can signal error | OK | OK | Not available | Service brake + auxiliary brake |
| DSC Hydraulics fault | OK | Not available | Not available | Service brake + auxiliary brake |
| Actuating mechanism fault | Not available | OK | Not available | Park position automatic gearbox |
| Fault in parking brake control unit | Not available | Not available | Not available | Park position automatic gearbox and, if applicable service brake + auxiliary brake |