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Test readings, control module connections

Test readings, control module connections




Scope

Values and directions for measuring control module voltages can be found under the relevant heading.

Remember:


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

The specified values 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 values do not indicate whether the actuator unit 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.

Test readings in %(+) and ms(+) show the pulse ratio and pulse duration of the signal. A test instrument capable of giving pulse ratio and pulse duration readings must be used. The (+) sign indicates a positive trigger pulse, TRIG+.



Main unit connections (contacts A, B, C)


> =greater than ; < = less than ; ~ = alternating current

(LP: LOGIC PROBE P = select pulse ; p = visible pulses

Connector (A)

Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1



No connection











2



No connection











3

RD/BN

Telephone mute

In

No telephone call.



Telephone call.

3(A)-8(A)



3(A)-8(A)

4-6 V



<2 V

Telephone system



4

BN/RD

Power supply (+15 circuit)

In

Ignition ON

4(A)-8(A)

B+



5

BK/WH

Trigger voltage

(electric antenna)

Out

Main unit on.

5(A)-8(A)



6

GN/WH

Rheostat











7

RD

Power supply (+30 circuit)

In



7(A)-8(A)

B+



8

BK

Ground





8(A) - good grounding point

<0.5V





Connector (B)

Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1

BK/GN

Loudspeaker Right Rear (+)

Out

Music playing.

1(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



2

BK/WH

Loudspeaker Right Rear (-)

Out

Music playing.

2(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



3

BN/BK

Loudspeaker Right Front (+)

Out

Music playing.

3(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



4

BN/RD

Loudspeaker Right Front (-)

Out

Music playing.

4(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



5

BN

Loudspeaker Left Front (+)

Out

Music playing.

5(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



6

BN/GY

Loudspeaker Left Front (-)

Out

Music playing.

6(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



7

BN/WH

Loudspeaker Left Rear (+)

Out

Music playing.

7(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



8

BN

Loudspeaker Left Rear (-)

Out

Music playing.

8(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.





Connector (C)

Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1

BN/BK

Phone line input, ground

In

-

-

-

Telephone system



2

WH

I-BUS (-)

In/Out

Ignition ON

2(C)-8(A)

2-3 V



3

OG

Phone line input, signal

In

-

-

-

Telephone system



4

GN

I-BUS (+)

In/Out

Ignition ON

4(C)-8(A)

2-3 V



5



No connection











6



No connection











7

RD

Line input CD changer

Left (-)

In

Music playing.

7(C)-9(C)

0-2 VAC. The test reading should vary with the volume of the music.



8

BN

Line input CD changer

Right (-)

In

Music playing.

8(C)-10(C)

0-2 VAC. The test reading should vary with the volume of the music.



9

BU

Line input CD changer

Left (+)

In

Music playing.

9(C)-7(C)

0-2 VAC. The test reading should vary with the volume of the music.



10

GN

Line input CD changer

Right (+)

In

Music playing.

10(C)-8(C)

0-2 VAC. The test reading should vary with the volume of the music.





Main unit connections (DIN connector)





Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1



Line output, external amplifier. Signal, left rear.

Not used.

Out









2



Signal ground, screen











3



Line output, external amplifier.

Signal, left front.

Out



3-2





4



Line output, external amplifier. Signal, right rear.

Not used.

Out









5



Line output, external amplifier.

Signal, right front

Out



5-2





6



Mute control

Out









7



No connection











8



Trigger voltage

Out

Main unit on.



Main unit off.

8-2

B+





0 V