Component: Drive Unit - Webasto Air Top 2000 STC Workshop Manual

6 Function checks

6.4.4 Component: drive unit

See Abb. 903, Item 5
Drive unit
Externally damaged?
No
Components installed
in heater => short to metal parts
(heat exchanger, etc.)?
No
Resistance > 6 ohms?
Yes
Start at 10 or 20 V?
No
Bearing noise?
No
4
610
Procedure
Yes
1
Visual inspection
Yes
1
Continuity meas-
urement
No
1
Yes
1
Drive motor start-
up
Yes
1
Subjective test
Air Top 2000 STC
Test and Visualisation
measuring
equipment
Digital
multimeter
Voltage source
Ensure correct polarity (+)/(–)
(–) = brown
(+) = red (12V), green (24V)
ATTENTION