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Measurement values, control module connections

Measurement values, control module connections




The following pages contain instructions and values for checking of the ACC-unit.

Keep in mind:


• Observe the measurement conditions. Use common sense when considering the test results and measurement values.

• First, check that the control module is supplied with power and that it is grounded.

Then, check all sensor inputs and signals from other systems.

Finally, check the control module outputs. Remember that the measured values do not indicate if the switch works or not.

• If a measured value is incorrect, use the wiring diagram to find out which leads, connectors or components that should be checked further.

• The indicated values refer to calibrated Fluke 88/97.

• The measured values indicate the pulse relation and pulse length of the signal. Test instrument with pulse quotient measurement respective pulse width measurement must be used.





ACC-unit, control module connections


Pin

Lead colour

Component/Function

In/Out

Measuring conditions

Measure between

Value

1

BK

Ground for control module

In

Ignition ON

4-1

B+

2

YE

Power supply, air recirculation motor

Out

Activate fresh air

2-21

+12V

2, cont'd

YE

Power supply, air recirculation motor

Out

Activate air recirculation

2-21

-12V

3

BN/RD

Connection for parking heater

In

Activate parking heater

3-1

B+

4

BN/GY

Power supply +15

In

Ignition ON or activated control module

4-1

B+

5

PK/WH

B+ current to fan control module

Out

Ignition ON

5-1

B+

6

PK

Stepping motor, air-mixing damper

Out

Ignition ON activate engine

6-25

50 Hz/50% LP Hi-Lo

7

BN/WH

Stepping motor, air-mixing damper

Out

Ignition ON activate engine

7-26

50 Hz/50% LP Hi-Lo

8

BU/WH

Stepping motor, air distribution damper

Out

Ignition ON activate engine

8-27

50 Hz/50% LP Hi-Lo

9

WH

Stepping motor, air distribution damper

Out

Ignition ON activate engine

9-28

50 Hz/50% LP Hi-Lo

10-13



No connection









14

GY/RD

Fan control module, control current

Out

Ignition ON change fan speed

14-1

0-5 V

15

YE/RD

Power supply fan, cabin temperature sensor

Out

Ignition ON

15-1

B+

16

BN/RD

Solar sensor

Out

Ignition ON

16-36

0-0.5 V

17-18



No connection









19

VT

Mixed-air temperature sensor

In

Ignition ON

19-38

see Technical data

20

BU/YE

Cabin temperature sensor

In

Ignition ON

20-39

see Technical data

21

RD

Power supply, air recirculation motor

Out

Activate air recirculation

2-21

LHD: -12 V

RHD: +12 V

21, cont'd.

RD

Power supply, air recirculation motor

Out

Activate fresh air

2-21

LHD: +12 V

RHD: -12 V

22

RD/WH

Power supply +30

In

Power supply +30

22-1

B+

23



No connection









24

BN/GY

Shut-off valve, heater box

Out

Ignition ON max cooling -LO

4-24

B+

25

BU/GN

Stepping motor, air-mixing damper

Out

Ignition ON activate engine

25-6

50 Hz/50% LP Hi-Lo

26

OG

Stepping motor, air-mixing damper

Out

Ignition ON activate engine

26-7

50 Hz/50% LP Hi-Lo

27

GN/WH

Stepping motor, air distribution damper

Out

Ignition ON activate engine

27-8

50 Hz/50% LP Hi-Lo

28

BN

Stepping motor, air distribution damper

Out

Ignition ON activate engine

28-9

50 Hz/50% LP Hi-Lo

29-32



No connection









33

GN

I-bus (+)

In/Out

Ignition ON

33-1

2-3 V

34

WH

I-bus (-)

In/Out

Ignition ON

34-1

2-3 V

35



No connection









36

YE/GN

Solar sensor ground

Out

Ignition ON

16-36

0-0.5 V

37



No connection









38

BU/RD

Air-mixing temperature sensor, ground

Out

Ignition ON

38-19

see Technical data

39

YE/BN

Cabin temperature sensor, sensor ground

Out

Ignition ON

39-20

see Technical data