PRE-RELEASE
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: |
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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)
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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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No connection
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2
|
RD/BU
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Power supply +15
|
In
|
Ignition ON.
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2-4
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B+
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3
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No connection
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4
|
BK
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Ground
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4 - good grounding point.
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<0.5V
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5
|
BK/WH
|
Mute control
|
Out
|
The ignition is switched on.
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8-5
|
<1 V after approx. 1 sec. B+ for approx. 10 sec.
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Audio System
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The ignition is switched off.
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8-5
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6
|
YE
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Telephone mute
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In
|
No telephone call.
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6-4
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4-6 V
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Telephone call.
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6-4
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<2 V
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7
|
GN
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Trigger voltage:
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Out
|
Main unit on.
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7-4
|
Audio System
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8
|
RD
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Power supply +30
|
In
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8-4
|
B+
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9
|
BN/RD
|
Line output, rear right (-)
|
Out
|
Music playing.
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9-4
|
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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10
|
BU
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Line output, front right (-)
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Out
|
Music playing.
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10-4
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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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11
|
RD/WH
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Line output, front left (-)
|
Out
|
Music playing.
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11-4
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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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12
|
OG/WH
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Line output, rear left (-)
|
Out
|
Music playing.
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12-4
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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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13
|
GY
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Line output, rear right (+)
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Out
|
Music playing.
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13-4
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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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14
|
RD
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Line output, front right (+)
|
Out
|
Music playing.
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14-4
|
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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15
|
BU/WH
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Line output, front left (+)
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Out
|
Music playing.
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15-4
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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
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YE/WH
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Line output, rear left (+)
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Out
|
Music playing.
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16-4
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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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17
|
WH
|
I-BUS (-)
|
In/Out
|
Ignition ON.
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17-4
|
2-3 V
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18
|
GN
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I-BUS (+)
|
In/Out
|
Ignition ON.
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18-4
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2-3 V
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19
|
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No connection
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20
|
BK
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CD changer RH line input (-)
|
In
|
Music playing.
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20-21
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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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21
|
BN
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CD changer RH line input (+)
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In
|
Music playing.
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21-20
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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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22
|
BK
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Phone line input, ground
|
In
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23
|
GY/WH
|
Phone line input, signal
|
In
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24
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No connection
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25
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RD/WH
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CD changer LH line input (-)
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In
|
Music playing.
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25-26
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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
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BU/WH
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CD changer RH line input (+)
|
In
|
Music playing.
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26-25
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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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