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Test readings, control module connections

Test readings, control module connections




Scope

Values and instructions for testing the voltage levels of the control modules are found under the relevant headed sections.

Remember


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

The test values presented apply when the ignition is in the ON position 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 values 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.

Test values 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 should be used. The (+) symbol indicates a positive trigger pulse, TRIG+.



Main unit connections (26-pin)


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

Pin no.

Cable colour

Component/

Function

In/Out

Test conditions

Across

Test reading

See

1



No connection











2

OG

Power supply (+15 circuit)

In

Ignition ON

2-4

B+



3



No connection











4

BK

Ground





4 - good grounding point

<0.5V



5

BK/WH

Mute control

Out

The ignition is switched on.

8-5

<1 V after approx. 1 sec. B+ for approx. 10 sec.

Audio System











The ignition is switched off.

8-5





6

YE

Telephone mute

In

No telephone call.

6-4



4-6 V











Telephone call.

6-4



<2 V



7

GN

Trigger voltage

Out

Main unit on.

7-4

Audio System



8

RD

Power supply (+30 circuit)

In



8-4

B+





9

BN/RD

Line output, rear right (-)

Out

Music playing.

9-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



10

BU

Line output, front right (-)

Out

Music playing.

10-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



11

RD/WH

Line output, front left (-)

Out

Music playing.

11-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



12

OG/WH

Line output, rear left (-)

Out

Music playing.

12-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



13

GY

Line output, rear right (+)

Out

Music playing.

13-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



14

RD

Line output, front right (+)

Out

Music playing.

14-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



15

BU/WH

Line output, front left (+)

Out

Music playing.

15-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



16

YE/WH

Line output, rear left (+)

Out

Music playing.

16-4

0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.

Audio System



17

WH

I-BUS (-)

In/Out

Ignition ON

17-4

2-3 V



18

GN

I-BUS (+)

In/Out

Ignition ON

18-4

2-3 V



19



No connection











20

BK

Line input, CD changer RH (-)

In

Music playing.

20-21

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

Audio System



21

RN

Line input, CD changer RH (+)

In

Music playing.

21-20

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

Audio System



22

BK

Phone line input, ground

In









23

GY/WH

Phone line input, signal

In









24



No connection











25

RD/WH

Line input, CD changer LH (-)

In

Music playing.

25-26

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

Audio System



26

BU/WH

Line input, CD changer RH (+)

In

Music playing.

26-25

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

Audio System