Checking the Ventilation Fan Control's Power Supply

Checking The Reference Ground Lead, Ventilation Fan Control







Unplug the connector:
- Ventilation fan control (220)












- Connect test lamp 86 11 857 to pin 5 of the female connector and a good grounding point.







- The test lamp should light.

Checking The Wiring Harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - III

YES - Checking the Reference Ground Lead, Ventilation Fan Control