Instructions for Extended Test Procedure (IHKA Integrated Automatic Heating/Air Conditioning)

Instructions For Extended Test Procedure

The quick-test found a fault code entry for all stepper motors. The fault entries may be attributed to several causes.
- MI motor bus is disconnected from the control unit (MI-bus not connected)
- One of the flap motors switches the MI-bus to positive
- One of the flap motors switches the MI-bus to negative

Troubleshooting should be carried out as follows:
- The flap motors are disconnected one after the other and the setting at the operating unit changed. If the remaining connected flap motors assume the selected position, the motor currently disconnected can be assumed as being faulty.