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: |
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Note the test conditions and use common sense when assessing the test result.
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The specified values are with the ignition 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 control module outputs. Remember that the values do not indicate whether the actuator unit is working.
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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 test readings given apply to a calibrated Fluke 88/97.
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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+.
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| Main unit connections (connections A, B, C) |
> =greater than ; < = less than ; ~ = alternating current
(LP: LOGIC PROBE P = select pulse ; p = visible pulses
Connector (A)
|
Pin No.
|
Lead colour
|
Component/
Function |
In/out
|
Test conditions
|
Across
|
Test reading
|
See
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1
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No connection
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2
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No connection
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3
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RD/BN
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Telephone mute
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In
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No telephone call.
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3(A)-8(A)
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4-6 V
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Telephone system
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Telephone call.
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3(A)-8(A)
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<2 V
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||
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4
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BN/RD
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Power supply (+15 circuit)
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In
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Ignition ON
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4(A)-8(A)
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B+
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5
|
BK/WH
|
Trigger voltage (electric antenna)
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Out
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Main unit on.
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5(A)-8(A)
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6
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GN/WH
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Rheostat
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7
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RD
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Power supply (+30 circuit)
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In
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7(A)-8(A)
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B+
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8
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BK
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Ground
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8(A) - good grounding point
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<0.5V
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Connector (B)
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Pin No.
|
Lead colour
|
Component/
Function |
In/out
|
Test conditions
|
Across
|
Test reading
|
See
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1
|
BK/GN
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Loudspeaker Right Rear (+)
|
Out
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Music playing.
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1(B)-8(A)
|
0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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2
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BK/WH
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Loudspeaker Right Rear (-)
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Out
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Music playing.
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2(B)-8(A)
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0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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3
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BN/BK
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Loudspeaker Right Front (+)
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Out
|
Music playing.
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3(B)-8(A)
|
0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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4
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BN/RD
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Loudspeaker Right Front (-)
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Out
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Music playing.
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4(B)-8(A)
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0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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5
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BN
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Loudspeaker Left Front (+)
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Out
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Music playing.
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5(B)-8(A)
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0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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6
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BN/GY
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Loudspeaker Left Front (-)
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Out
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Music playing.
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6(B)-8(A)
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0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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7
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BN/WH
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Loudspeaker Left Rear (+)
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Out
|
Music playing.
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7(B)-8(A)
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0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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8
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BN
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Loudspeaker Left Rear (-)
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Out
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Music playing.
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8(B)-8(A)
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0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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Connector (C)
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Pin No.
|
Lead colour
|
Component/
Function |
In/out
|
Test conditions
|
Across
|
Test reading
|
See
|
|
1
|
BN/BK
|
Phone line input, ground
|
In
|
-
|
-
|
-
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Telephone system
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2
|
WH
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I-BUS (-)
|
In/Out
|
Ignition ON
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2(C)-8(A)
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2-3 V
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3
|
OG
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Phone line input, signal
|
In
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-
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-
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-
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Telephone system
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4
|
GN
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I-BUS (+)
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In/Out
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Ignition ON
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4(C)-8(A)
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2-3 V
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5
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No connection
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6
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No connection
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7
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RD
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Line input CD changer
Left (-) |
In
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Music playing.
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7(C)-9(C)
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0-2 VAC. The test reading should vary with the volume of the music.
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8
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BN
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Line input CD changer
Right (-) |
In
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Music playing.
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8(C)-10(C)
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0-2 VAC. The test reading should vary with the volume of the music.
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9
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BU
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Line input CD changer
Left (+) |
In
|
Music playing.
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9(C)-7(C)
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0-2 VAC. The test reading should vary with the volume of the music.
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10
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GN
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Line input CD changer
Right (+) |
In
|
Music playing.
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10(C)-8(C)
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0-2 VAC. The test reading should vary with the volume of the music.
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| Main unit connections (DIN connector) |
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Pin No.
|
Lead colour
|
Component/
Function |
In/out
|
Test conditions
|
Across
|
Test reading
|
See
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1
|
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Line output, external amplifier. Signal, left rear.
Not used. |
Out
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2
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Signal ground, screen
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3
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Line output, external amplifier.
Signal, left front. |
Out
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3-2
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4
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Line output, external amplifier. Signal, right rear.
Not used. |
Out
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5
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Line output, external amplifier.
Signal, right front |
Out
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5-2
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6
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Mute control
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Out
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7
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No connection
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8
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Trigger voltage
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Out
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Main unit on.
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8-2
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B+
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Main unit off.
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8-2
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0 V
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