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Test readings, control module connections

Test readings, control module connections




The following pages contain directions and test values for the MCC 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 given apply to a 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.





MCC unit, control module connections

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

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

BK

Control module ground

In



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

Activated parking heater

3-1

B+

4

BU/RD

Power supply +15

In

Ignition ON

4-1

B+

5

BU/WH

Guide lights for buttons

In

Ignition ON

5-1

B+

6

GN/YE

Stepping motor, mixed-air, LH

Out

Ignition ON calibrate

6-25

50 Hz/ 50% LP Hi-Lo

7

YE/BN

Stepping motor, mixed-air, LH

Out

Ignition ON calibrate

7-26



50 Hz/ 50% LP Hi-Lo

8

RD/WH

Stepping motor, air distribution flap

Out

Ignition ON calibrate

8-27



50 Hz/ 50% LP Hi-Lo

9

RD/BU

Stepping motor, air distribution flap

Out

Ignition ON calibrate

9-28

50 Hz/ 50% LP Hi-Lo

10

WH/BK

Stepping motor, mixed-air, RH

Out

Ignition ON calibrate

10-29

50 Hz/ 50% LP Hi-Lo

11

RD/BU

Stepping motor, mixed-air, RH

Out

Ignition ON calibrate

11 - 30

50 Hz/ 50% LP Hi-Lo

12



No connection









13

OG/WH

Power supply fan control module

Out

Ignition ON

13-35

B+

14

GN/BU

Fan control module voltage

Out

Ignition ON change fan speed

14-1

0-5 V

15

GN/WH

A/C request

Out

Ignition ON Press in A/C button

15-1

B+

16

GN/YE

Electrically heated rear window request

Out

Ignition ON Press button for heated rear window

16-1

B+

for 0.2 s

17

BU/WH

LED heated rear window on, from DICE

In

Ignition ON, DICE engages relay, see DICE for inhibitor conditions

4-17

B+

18-20



No connection

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

No connection







24

WT/GN

Heat exchanger shut-off valve

Out

Ignition ON Turn both controls to max cooling

4-24

B+

25

VT/WH

Stepping motor, mixed-air, LH

Out

Ignition ON

Select max cold both zones

25-6



50 Hz/ 50 %

LP Hi-Lo

26

YE/WH

Stepping motor, mixed-air, LH

Out

Ignition ON

Select max cold both zones

26-7

50 Hz/ 50 %

LP Hi-Lo

27

WH/YE

Stepping motor, air distribution flap

Out

Ignition ON

Select defrost/ventilation for both zones

27-8

50 Hz/ 50 %

LP Hi-Lo

28

RD/VT

Stepping motor, air distribution flap

Out

Ignition ON

Select defrost/ventilation for both zones

28-9

50 Hz/ 50 %

LP Hi-Lo

29

WH

Stepping motor, mixed-air, RH

Out

Ignition ON

Select max cold both zones

29-10



50 Hz/ 50 %

LP Hi-Lo

30

BK/VT

Stepping motor, mixed-air, RH

Out

Ignition ON

Select max cold both zones

30-11

50 Hz/ 50 %

LP Hi-Lo

31-34



No connection











35

WH/GN

Fan control module reference ground

In

Ignition ON

35-4

B+

36-39



No connection