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Test readings, control module connections

Test readings, control module connections

Scope



The following pages include values and directions for measuring signals and levels on the main instrument unit and its control module.

Remember


• Note the test conditions and use common sense when assessing the test result.

• The specified test readings are with the ignition ON unless otherwise stated.

• First check that the control module has a power supply 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 specified test readings refer to those obtained with a calibrated Fluke 88/97.

• The test values %(+) and ms(+) indicate the pulse ratio and pulse duration of the signal. A scan tool for measuring pulse ratio and pulse duration must be used. The (+) sign indicates a positive trigger pulse, TRIG+.


K12


Pin

Pin BOB

Lead colour

Component/function

In/Out

Test conditions

Across

Test reading

See

1 (K12)

21

BU/RD

Battery Voltage +15

In



21-B+

<0.5 V



2 (K12)

22

BK

Ground

In



22-B-

<0.5 V



3 (K12)

23

BK

Ground

In



23-B-

<0.1 V



4 (K12)

24

GN

P-bus (+)

In/Out



24-22

2.5 V



5 (K12)

25

GN

I-bus (+)

In/Out



25-22

2.5 V



6 (K12)

26

BU/RD

Battery Voltage +15

In



26-B+

<0.5 V



7 (K12)

27

RD

Battery Voltage +30

In



27-B+

<0.5 V



8 (K12)

28

GY/WH

Ground, Sensor ground, fuel level sensor

Out



28-B-

<0.1 V



9 (K12)

29

YE/WH

Sensor, fuel level

In



29-28

0.5-3.7 V



10 (K12)

30



VT



Wheel speed, Rear left



In



Rotate wheel slowly

30-32

0 V/B+

(LP Hlp LOp )



Rotate wheel 1/2 revolution per second

30-22

15 Hz

50%

(LP Hlp LOp )



11 (K12)

31

WH

P-bus (-)





31-22

2.5 V



12 (K12)

32

WH

I-bus (-)





32-22

2.5 V





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

K20


Pin

Pin BOB

Lead colour

Component/function

In/Out

Test conditions



Across

Test reading

See

1 (K20)

1

VT/WH



Warning lamp, AIRBAG

In



On

1-B-

0 V





Off

1-B-

B+

2 (K20)

2

BU



Engine oil pressure warning lamp

In



On

2-B-

0 V





Off

2-B-

B+

3 (K20)

3

YE



Warning lamp, charging

In





On

3-B-

0 V





Off

3-B-

B+

4 (K20)

4



No connection













5 (K20)

5



No connection











6 (K20)

6



No connection













7 (K20)

7



No connection













8 (K20)

8



No connection













9 (K20)

9

GN/RD

Lights-on indicator lamp

In



On

9-B-

B+





Off

9-B-

0 V

10 (K20)

10

OG

ABS warning lamp

In



On

10-B-

0 V





Off

10-B-

B+

11 (K20)

11

GN



Warning lamp, handbrake

In







On

11-B-

0 V





Off

11-B-

B+

12 (K20)

12

BU

Warning lamp, brake fluid level

In







On

12-B-

0 V





Off

12-B-

B+

13 (K20)

13



No connection













14 (K20)

14



No connection













15 (K20)

15

WH

Main beam indicator lamp

In



On

15-B-

B+



Off

15-B-

0 V

16 (K20)

16



No connection











17 (K20)

17



No connection











18 (K20)

18



No connection













19 (K20)

19



No connection













20 (K20)

20



No connection















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