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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| Connections, head unit |
> = greater than; < = less than; ~ = AC voltage (LP: LOGIC PROBE P = select pulse; p = visible pulses)
K14
|
Pin no.
|
Component/
Function |
In/Out
|
Test conditions
|
Across
|
Test reading
|
See
|
|
1
|
Power supply +30
|
In
|
|
1-8
|
B+
|
|
|
2
|
Line output, front left (+)
|
Out
|
Music playing
|
2-8
|
Radio system 1:
Normal sound level, ∼0-2 VAC. Max. volume, ∼0-10 VAC.
Radio system 2 and 3: Max. volume ∼2-3 VAC. The test reading should vary with the volume of the music. |
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3
|
Line output, front right (+)
|
Out
|
Music playing
|
3-10
|
Radio system 1:
Normal sound level, ∼0-2 VAC. Max. volume, ∼0-10 VAC.
Radio system 2 and 3: Max. volume ∼2-3 VAC. The test reading should vary with the volume of the music. |
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|
4
|
Phone line input, signal
|
In
|
Call active
|
4-5
|
∼0-300 mVAC
|
Telephone system
|
|
5
|
Phone line input, ground
|
In
|
Call active
|
4-5
|
∼0-300 mVAC
|
Telephone system
|
|
6
|
Trigger voltage, amplifier
|
Out
|
Radio switched on
|
6-8
|
B+
|
|
|
7
|
No connection
|
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8
|
Ground
|
In
|
|
1-8
|
B+
|
|
|
9
|
Line output, front left (-)
|
Out
|
Music playing
|
3-9
|
Radio system 1:
Normal sound level, ∼0-2 VAC. Max. volume, ∼0-10 VAC.
Radio system 2 and 3: Max. volume ∼2-3 VAC. The test reading should vary with the volume of the music. |
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10
|
Line output, front right (-)
|
Out
|
Music playing
|
3-10
|
Radio system 1:
Normal sound level, ∼0-2 VAC. Max. volume, ∼0-10 VAC.
Radio system 2 and 3: Max. volume ∼2-3 VAC. The test reading should vary with the volume of the music. |
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11
|
No connection
|
|
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|
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12
|
Trigger voltage antenna
|
Out
|
Main unit on
|
12-8
|
B+
|
|
|
13
|
I-bus (1-lead)
|
In/Out
|
Ignition ON
|
13-8
|
2-3 V
|
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|
14
|
No connection
|
|
|
|
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K16
|
Pin no.
|
Component/
Function |
In/Out
|
Test conditions
|
Across
|
Test reading
|
See
|
|
1
|
Line input satellite radio receiver Right (+)
|
In
|
Music playing
|
1-9
|
0-2 V AC. The test reading should vary with the volume of the music.
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|
2
|
Line input satellite radio receiver Right (+)
|
In
|
Music playing
|
2-10
|
0-2 V AC. The test reading should vary with the volume of the music.
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|
3
|
No connection
|
|
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4
|
Telephone mute
|
In
|
No telephone call
|
4-8 in K14
|
5 V
|
Telephone system
|
|
|
|
|
Telephone call
|
4-8 in K14
|
<2 V
|
|
|
5
|
Line output, rear left (+)
|
Out
|
Music playing
|
5-13
|
Radio system 1:
Normal sound level, ∼0-2 VAC. Max. volume, ∼0-10 VAC.
Radio system 2 and 3: Max. volume ∼2-3 VAC. The test reading should vary with the volume of the music. |
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6
|
Line output, rear right (+)
|
Out
|
Music playing
|
6-14
|
Radio system 1:
Normal sound level, ∼0-2 VAC. Max. volume, ∼0-10 VAC.
Radio system 2 and 3: Max. volume ∼2-3 VAC. The test reading should vary with the volume of the music. |
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7
|
No connection
|
|
|
|
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8
|
Mute control, amplifier
|
Out
|
The ignition is switched on
|
8-8 in K14
|
<1 V after approx. 1 sec. B+ for approx. 10 sec.
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The ignition is switched off
|
8-8 in K14
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9
|
Line input satellite radio receiver Left (-)
|
In
|
Music playing
|
1-9
|
0-2 V AC. The test reading should vary with the volume of the music.
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10
|
Line input satellite radio receiver Right (-)
|
In
|
Music playing
|
2-10
|
0-2 V AC. The test reading should vary with the volume of the music.
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11
|
No connection
|
|
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12
|
No connection
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|
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13
|
Line output, rear left (-)
|
Out
|
Music playing
|
8-13
|
0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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14
|
Line output, rear right (-)
|
Out
|
Music playing
|
6-14
|
0-2 V AC. Dependent on volume control. The test reading should vary with the volume of the music.
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15
|
No connection
|
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16
|
No connection
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