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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.

• 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 test instrument 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 circuit)

In

Ignition ON

21-B+

< 0.5 V



2 (K12)

22

BK

Ground

In

Ignition ON

22-B-

< 0.5 V



3 (K12)

23

BK

Ground

In

Ignition ON

23-B-

< 0.1 V



4 (K12)

24

GN

P-bus (+)

In/Out

Ignition ON

24-22

2.5 V



5 (K12)

25

GN

I Bus (+)

In/Out

Ignition ON

25-22

2.5 V



6 (K12)

26

BU/RD

Battery Voltage (+15 circuit)

In

Ignition ON

26-B+

< 0.5 V



7 (K12)

27

RD

Battery Voltage (+30 circuit)

In

Ignition ON

27-B+

< 0.5 V



8 (K12)

28

GY/WH

Ground, Sensor ground, fuel level sensor

Out

Ignition ON

28-B-

< 0.1 V



9 (K12)

29

YE/WH

Sensor, fuel level

In

Ignition ON

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 HI LOp)



Rotate wheel 1/2 revolution per second

30-22

15 Hz 50%

(LP HI LOp)



11 (K12)

31

WH

P-bus (-)



Ignition ON

31-22

2.5 V



12 (K12)

32

WH

I Bus (-)



Ignition ON

32-22

2.5 V





> = greater than; < = less than; » = approximately equal to; ~ = 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

Ignition ON

On

1-B-

0 V



Out

1-B-

B+



2 (K20)

2

BU



Engine oil pressure warning lamp

In

Ignition ON

On

2-B-

0 V



Out

2-B-

B+



3 (K20)

3

YE



Warning lamp, charging

In



Ignition ON

On

3-B-

0 V



Out

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

Ignition ON

On

9-B-

B+



Out

9-B-

0 V



10 (K20)

10

OG

ABS warning lamp

In

Ignition ON

On

10-B-

0 V



Out

10-B-

B+



11 (K20)

11

GN



Warning lamp, handbrake

In



Ignition ON



On

11-B-

0 V



Out

11-B-

B+



12 (K20)

12

BV

Warning lamp, brake fluid level

In



Ignition ON



On

12-B-

0 V



Out

12-B-

B+



13 (K20)

13



No connection













14 (K20)

14



No connection













15 (K20)

15

WH



Main beam indicator lamp

In



Ignition ON

On

15-B-

B+



Out

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; » = approximately equal to; ~ = alternating current (LP: LOGIC PROBE P = select pulse; p = visible pulse)