Test readings, control module connections
| Test readings, control module connections |
| Scope |
Nominal values and instructions for measuring voltages on the control module can be found under the respective headings below.
| Remember: |
| • |
Note the test conditions and use common sense when assessing the test result.
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| • |
The nominal test readings shown apply with the ignition switched ON unless otherwise stated.
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| • |
First check that the control module has a power supply and is grounded.
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Then check all sensor inputs and signals from other systems.
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Finally, check the outputs. Remember that the test readings do not tell us whether or not the module is functioning properly.
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If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.
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The specified test readings refer to those obtained with a calibrated Fluke 88/97.
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Test readings % (+) and ms (+) show the pulse ratio and pulse duration of the signal. The test instrument used must be able to measure pulse ratio and pulse width. The (+) sign denotes a positive trigger pulse, TRIG+.
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| Main unit connections (26-pin) |
> = greater than; < = less than; ~ = AC voltage (LP: LOGIC PROBE P = select pulse; p = visible pulses)
|
Pin no.
|
Lead colour
|
Component/
Function |
In/Out
|
Test conditions
|
Across
|
Test reading
|
See
|
|
1
|
|
No connection
|
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2
|
RD/BU
|
Power supply +15
|
In
|
Ignition ON.
|
2-4
|
B+
|
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3
|
|
No connection
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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
|
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The ignition is switched off.
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8-5
|
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6
|
YE
|
Telephone mute
|
In
|
No telephone call.
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6-4
|
4-6 V
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Telephone call.
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6-4
|
<2 V
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7
|
GN
|
Trigger voltage:
|
Out
|
Main unit on.
|
7-4
|
Audio System
|
|
|
8
|
RD
|
Power supply +30
|
In
|
|
8-4
|
B+
|
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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
|
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10
|
BU
|
Line output, front right (-)
|
Out
|
Music playing.
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10-4
|
0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.
|
Audio System
|
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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
|
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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
|
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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
|
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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
|
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15
|
BU/WH
|
Line output, front left (+)
|
Out
|
Music playing.
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15-4
|
0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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Audio System
|
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16
|
YE/WH
|
Line output, rear left (+)
|
Out
|
Music playing.
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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
|
|
|
|
|
|
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20
|
BK
|
CD changer RH line input (-)
|
In
|
Music playing.
|
20-21
|
0-2 V AC. The test reading should vary with the volume of the music.
|
Audio System
|
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21
|
BN
|
CD changer RH line input (+)
|
In
|
Music playing.
|
21-20
|
0-2 V AC. The test reading should vary with the volume of the music.
|
Audio System
|
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22
|
BK
|
Phone line input, ground
|
In
|
|
|
|
|
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23
|
GY/WH
|
Phone line input, signal
|
In
|
|
|
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24
|
|
No connection
|
|
|
|
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25
|
RD/WH
|
CD changer LH line input (-)
|
In
|
Music playing.
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25-26
|
0-2 V AC. The test reading should vary with the volume of the music.
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Audio System
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26
|
BU/WH
|
CD changer RH line input (+)
|
In
|
Music playing.
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26-25
|
0-2 V AC. The test reading should vary with the volume of the music.
|
Audio System
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