System test

Special diagnosis routines can be run with this menu item.

The following conditions must be observed for the system test:

Vehicle speed < 10 km/h

Engine start detected and 10 seconds elapsed since engine start

Terminal 15 supply voltage OK

5-volt supply voltage OK

Engine temperature < 110 °C

Outside temperature > 3 °C

The following tests are performed:

Display of all segments in the control module

The drive motors are traversed across the entire range once

The measured positioning travel is subjected to a plausibility test and stored as a fault

Two different voltage values are set on the fresh-air blower and tested

The VC circuit is tested via the DME

All fault paths are tested, and any faults

After the system test, the heating/air conditioning reverts to the state it was in before the test.

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