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Test readings, entertainment head unit (353)

Test readings, entertainment head unit (353)

Scope



The following pages contain readings and instructions for measuring signals and levels on the head unit and its control module.

Remember:


Note the test conditions and use common sense when assessing test results.

First check that the control module has a power supply and is grounded.

Then check all sensor inputs and signals from other systems.

Lastly, check the control module outputs. Remember, the readings do not say anything about whether or not the actuator is in working order.

If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.

The specified test readings refer to those obtained with a calibrated Fluke 88/97.

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+.


Control module connections


K8A

Pin Component/Function In/Out Test conditions Across Test reading
1 Speaker, left front (-) Signal unreadable
2 Speaker, left front (+) Signal unreadable
3 Speaker, left rear (-) Signal unreadable
4 Speaker, left rear (+) Signal unreadable
5 Speaker, right front (-) Signal unreadable
6 Speaker, right front (+) Signal unreadable
7 Speaker, right rear (-) Signal unreadable
8 Speaker, right rear (+) Signal unreadable



K8B

Pin Component/Function In/Out Test conditions Across Test reading
9 Tele (-)
10 Tele (+)
11 Tele Mute
12 Ground Out 12-16 B+
13 Antenna Trig In Ignition ON 13-12 B+
14 No connection
15 No connection
16 +30 In 16-12 B+



O-bus

Pin Component/Function In/Out Test conditions Across Test reading
1 Optic RX Signal unreadable
2 Optic TX Signal unreadable



K12

Pin Component/Function In/Out Test conditions Across Test reading
1 No connection
2 No connection
3 No connection
4 AUX right (+) In
5 AUX left (+) In
6 No connection
7 No connection
8 No connection
9 No connection
10 AUX ground Out
11 No connection
12 No connection