Heater blower, testing electrical system TM

AD83.40-S-6001-04A

Heater blower, testing electrical system TM





Scope of test

Measuring instrument/

Test connection

Operation/Requirement

Specified value

 Possible cause/Remedy

1.0

Heater blower M40

Voltage supply terminal 30





A20.1



 5

Connector 1 disconnected from A20

11 - 14 V

 Cables

 Fuse F105/f7

 Battery

 1.1

1.1

Heater blower M40

Open-circuit

M40r35

1 

2 

3 

4 











A20.1

 1

 2

 3

 4

Connector 1 disconnected from A20

Preresistor connector at heater blower disconnected

< 5 Ω

< 5 Ω

< 5 Ω

< 5 Ω

 Cables

 1.2

1.2

Signal

1 



M40r35



 2

Connector from engine heater blower M40m45 disconnected

Blower knurl (A20s2):

At setting 1

At setting 2

At setting 3

At setting 4

11 - 14 V

11 - 14 V

11 - 14 V

11 - 14 V

 Preresistor heater blower

AD83.30-S-6001-05A

 Blower knurl (A20s2) in climate control pushbutton control unit (A20)

 1.3

1.3

Engine heater blower M40m45

Ground connection





M40m45



 2

Connector from engine heater blower M40m45 disconnected

< 5 Ω

 Cables

 Ground connection to W17.3

 1.4

1.4

Engine heater blower M40m45

Internal resistance

1 



M40m45



 2

Connector from engine heater blower M40m45 disconnected

approx. 1 Ω

 Engine heater blower M40m45