Component Tests and General Diagnostics

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 if necessary
- Two different voltage values are set on the fresh-air blower and tested
- The A/C circuit is tested via the DME
- All fault paths are tested, and any faults are stored

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