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Test readings, control module connections

Test readings, control module connections




The following pages contain directions and test values for the ACC unit.

Remember:


Note the test conditions. Use common sense when assessing the test result.

First check that the control module is supplied with current and is grounded.

Then check all sensor inputs and signals from other systems.

Finally, check the control module outputs. Remember that the test readings do not indicate whether the actuator is working.

If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.

The test readings indicated refer to calibrated FLUKE 88/97.

The test values indicate the pulse ratio and pulse length of the signal respectively. A test instrument for measuring pulse ratio and pulse width respectively must be used.





ACC unit, control module connections

> = greater than < = less than ~ = alternating current (LP: LOGIC PROBE P = select pulse; p = visible pulses).

pin nr Cable colour Component/function In/Out Test conditions Between X and Y Test reading
1

BK

Control module ground

In

Ignition ON

4-1

B+

2

RD/WH



Air recirculation motor power supply



Out



Activate fresh air

2-21

+12V for approx. 10s

Activate air recirculation

2-21

-12V for approx. 10s

3



Parking heater connection

In

Activate parking heater

3-1



B+



4

BU/RD

Power supply +15

In

Ignition ON or activated control module

4-1



B+

5

OG/WH

B+ voltage ON fan control module

Out

Ignition ON

5-1



B+



6

GN/YE

Stepping motor, mixed-air, LH

Out

Ignition ON activate motor

6-25



50 Hz/ 50 %

LP Hi-Lo

7

YE/BN

Stepping motor, mixed-air, LH

Out

Ignition ON activate motor

7-26



50 Hz/ 50 %

LP Hi-Lo

8

RD/WH

Stepping motor, air distribution flap

Out

Ignition ON activate motor

8-27



50 Hz/ 50% LP Hi-Lo

9

RD/BU

Stepping motor, air distribution flap

Out

Ignition ON activate motor

9-28



50 Hz/ 50% LP Hi-Lo

10

WH/BK

Stepping motor, mixed-air, RH

Out

Ignition ON activate motor

10-29

50 Hz/ 50% LP Hi-Lo

11

RD/BU

Stepping motor, mixed-air, RH

Out

Ignition ON activate motor

11-30



50 Hz/ 50% LP Hi-Lo

12-13



No connection









14

GN/BU

Fan control module control voltage

Out

Ignition ON change fan speed

14-1

0-5 V

15



No connection









16

YE/GN

Solar sensor, B+ power supply and clock pulse

Out

Ignition ON

16-36

12 V, 25 Hz, TRIGG, 1%, LP Hi-Lo p

17

WH

Solar sensor test lead

In

Ignition ON

17-36

0-5V PULSETRAIN LP Hi-Lo p

18

BN/RD

Mixed-air temperature sensor, RH

In

Ignition ON

18-37

see Technical data

19

BN/OG

Mixed-air temperature sensor, LH

In

Ignition ON

19-38

see Technical data

20

OG/WH

Cabin temperature sensor

In

Ignition ON

20-39

see Technical data

21

GN/WH

Air recirculation motor power supply

Out

Activate air recirculation

21-2

+12V for approx. 10s

Activate fresh air

21-2

-12V for approx. 10s

22

RD

Power supply +30

In

Power supply +30

22-1

B+

23

WH

Circulation pump

Out

Activate motor

4-23

B+

24

WT/GN

Heat exchanger shut-off valve

Out

Ignition ON

4-24

B+

25

VT/WH

Stepping motor, mixed-air, LH

Out

Ignition ON

Activate motor

25-6

50 Hz/ 50 %

LP Hi-Lo

26

YE/WH

Stepping motor, mixed-air, LH

Out

Ignition ON

Activate motor

26-7

50 Hz/ 50% LP Hi-Lo

27

WH/YE

Stepping motor, air distribution flap

Out

Ignition ON

Activate motor

27-8

50 Hz/ 50% LP Hi-Lo

28

RD/VT

Stepping motor, air distribution flap

Out

Ignition ON

Activate motor

28-9

50 Hz/ 50% LP Hi-Lo

29

WH

Stepping motor, mixed-air, RH

Out

Ignition ON

Activate motor

29-10

50 Hz/ 50% LP Hi-Lo

30

BK/VT

Stepping motor, mixed-air, RH

Out

Ignition ON

Activate motor

30-11

50 Hz/ 50% LP Hi-Lo

31-32



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

WH/GN

Fan control module reference ground

Out

Ignition ON

5-35

B+

36

BU/RD

Solar sensor, ground

Out

Ignition ON

16-36

12 V, 25 Hz, TRIGG, 1%, LP Hi-Lo p

37

VT

Mixed-air temperature sensor, right ground

Out

Ignition ON

18-37

see Technical data

38

BN/WH

Mixed-air temperature sensor, LH ground

Out

Ignition ON

19-38

see Technical data

39

YE/WH

Inside temperature sensor ground

Out

Ignition ON

20-39

see Technical data