Test readings, entertainment head unit (353)
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Test readings, entertainment head unit (353)
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The following pages contain readings and instructions for measuring signals and levels on the head unit and its control module.
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Note the test conditions and use common sense when assessing test results.
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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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Lastly, check the control module outputs. Remember, the readings do not say anything about whether or not the actuator is in working order.
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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 signal's pulse ratio and pulse width. A test instrument with pulse ratio and pulse width measurement must be used. The sign (+) indicates a positive trigger pulse, TRIG+.
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Control module connections
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K8A
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Pin
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Component/Function
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In/Out
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Test conditions
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Across
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Test reading
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1
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Speaker, left front (-)
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Signal unreadable
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2
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Speaker, left front (+)
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Signal unreadable
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3
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Speaker, left rear (-)
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Signal unreadable
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4
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Speaker, left rear (+)
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Signal unreadable
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5
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Speaker, right front (-)
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Signal unreadable
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6
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Speaker, right front (+)
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Signal unreadable
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7
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Speaker, right rear (-)
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Signal unreadable
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8
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Speaker, right rear (+)
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Signal unreadable
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K8B
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Pin
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Component/Function
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In/Out
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Test conditions
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Across
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Test reading
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9
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Tele (-)
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10
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Tele (+)
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11
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Tele Mute
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12
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Ground
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Out
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12-16
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B+
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13
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Antenna Trig
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In
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Ignition ON
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13-12
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B+
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14
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No connection
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15
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No connection
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16
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+30
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In
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16-12
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B+
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O-bus
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Pin
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Component/Function
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In/Out
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Test conditions
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Across
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Test reading
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1
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Optic RX
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Signal unreadable
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2
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Optic TX
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Signal unreadable
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K12
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Pin
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Component/Function
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In/Out
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Test conditions
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Across
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Test reading
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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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No connection
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4
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AUX right (+)
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In
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5
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AUX left (+)
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In
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6
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No connection
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7
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No connection
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8
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No connection
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9
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No connection
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10
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AUX ground
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Out
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11
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No connection
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12
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No connection
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