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Test readings, control module connections

Test readings, control module connections




Instructions and values for measuring the ACC unit are available on the following pages.

Remember:


Observe the test conditions. Use common sense when evaluating test results.

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

Then check all sensor inputs and signals from other systems.

Check the control module outputs last. Remember that the test readings do not indicate whether or not the actuator is working.

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

The specified test readings refer to a calibrated Fluke 88/97.

The test readings show respectively the pulse ratio and pulse duration of the signal. A test instrument capable of measuring both pulse ratio and pulse duration must be used.





ACC unit, control module connections

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

Connector 1 (K1) 40-pin, test readings

Pin no. Component/function In/Out Test conditions Between X and Y Test reading
1

Ground for control module

In

Ignition ON

4-1

B+

2

Seat ventilation, left



Out





2-11

Stage 1: 9.5 V

Stage 2: B+

3

Parking heater connection

In

Activate parking heater

3-1

B+



4

Power supply (+15 circuit)

In

Ignition ON or active control module

4-1

B+

5

I-Bus (-)

In/Out

Ignition ON

5-1

2-3 V



6

I-Bus (+)

In/Out

Ignition ON

6-1

2-3 V

7

PPS "Passenger Airbag" (US/CA)(from DICE)

In

Ignition ON

7-1

PWM signal 3.5-B+

8

PPS "ON" (US/CA)

Out





9

+15

In

Ignition ON

B+

10

PPS "OFF"

Out

US/CA





11

Seat ventilation, return ground

In



11-2/12



12

Seat ventilation, right

Out



12-11

Stage 1: 9.5 V

Stage 2: B+

13

Fan control module's control voltage

Out

Ignition ON change fan speed

13-1

0-5 V

14

Shut-off valve, heat exchanger

Out

Ignition ON

4-14

B+

15

Circulation Pump

Out

Activate motor

4-15

B+

16

Cabin temperature sensor

In

Ignition ON

16-22

See Technical data

17

Solar sensor, test line

In

Ignition ON

17-22

0-5V PULSE TRAIN, LP Hi-Lo p

18

Blended-air temperature sensor, RH

In

Ignition ON

18-25

see Technical data

19

Blended-air temperature sensor, LH

In

Ignition ON

19-24

see Technical data

20

B+ -voltage ON fan control module

Out

Ignition ON

20-1

B+

21

Power supply +30

In

Power supply +30

21-1

B+

22

Solar sensor ground

Out

Ignition ON

26-22

12 V, 25 Hz TRIGGER, 1% LP Hi_Lo p

22

Interior temperature sensor ground

Out

Ignition ON

16-22

See Technical data

24

Mixed air temperature sensor, left ground

Out

Ignition ON

19-24

See Technical data

25

Mixed air temperature sensor, right ground

Out

Ignition ON

18-25

See Technical data

26

Solar sensor, B+ power supply (clock pulse)

Out

Ignition ON

26-22

12 V, 25 Hz TRIGGER, 1%

LP Hi-Lo p

27

Power supply, air recirculation motor

Out

Activate fresh air

27-28

+12 V for approx. 10s

28

Power supply, air recirculation motor

Out

Activate air recirculation

28-27

-12 V for approx. 10s

29

Stepping motor, mixed air, left

Out

Ignition ON

activate motor

29-40

50 Hz/ 50 % LP Hi-Lo

30

Stepping motor, mixed air, left

Out

Ignition ON

activate motor

30-39

50 Hz/ 50 % LP Hi-Lo

31

Stepping motor, mixed air, right

Out

Ignition ON

activate motor

31-33

50 Hz/ 50 % LP Hi-Lo

32

Stepping motor, mixed air, right

Out

Ignition ON

activate motor

32-34

50 Hz/ 50 % LP Hi-Lo

33

Stepping motor, mixed air, right

Out

Ignition ON

activate motor

33-31

50 Hz/ 50 % LP Hi-Lo

34

Stepping motor, mixed air, right

Out

Ignition ON

activate motor

34-32

50 Hz/ 50 % LP Hi-Lo

35

Stepping motor, air distribution flap

Out

Ignition ON

activate motor

35-37

50 Hz/ 50 % LP Hi-Lo

36

Stepping motor, air distribution flap

Out

Ignition ON

activate motor

36-38

50 Hz/ 50 % LP Hi-Lo

37

Stepping motor, air distribution flap

Out

Ignition ON

activate motor

37-35

50 Hz/ 50 % LP Hi-Lo

38

Stepping motor, air distribution flap

Out

Ignition ON

activate motor

38-36

50 Hz/ 50 % LP Hi-Lo

39

Stepping motor, mixed air, left

Out

Ignition ON

activate motor

39-30

50 Hz/ 50 % LP Hi-Lo

40

Stepping motor, mixed air, left

Out

Ignition ON

Activate motor

40-29

50 Hz/ 50 % LP Hi-Lo



Connector 2 (K2) 6-pin, test readings

Pin no.

Component/function

In/Out

Test conditions

Between X and Y

Test reading

1

Seat heating, left

Out

Ignition ON

Activate motor

1 (K1) -1

B+

2-3

+30

In



1 (K1) -2/3

B+

4

Seat heating, temperature sensor, left

In



23 (K1)-4

See Technical data, heating pad, seat

5

Seat heating, temperature sensor, right

In



23 (K1)-5

See Technical data, heating pad, seat

6

Seat heating, right

Out

Ignition ON

Activate motor

1 (K1) -6

B+