Webasto Air Top 2000 STC Installation Instructions Manual page 27

Electrical Connections
11.4. Control element connection
The wiring harness is prepared for connection to the control element.
Only pull on the connector housing to unplug the connector.
The connector housing will lock (self-locking action) by pulling on the wiring
harness.
NOTE:
The fibre optic cable must make contact with the rotary knob .
Fig. 25: Control element
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Fig. 26: Installation of control element
Fig. 27: Installation of control element (wrong)
Air Top 2000 STC