9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT) (2003)
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Wiring Harness: Description and Operation
System Overview
System Overview
Wiring harnesses
The car's electrical system is divided into the following wiring harnesses:
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front
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power train
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Trionic
-
Motronic
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dashboard
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rear
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driver's door
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passenger door
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rear door
-
roof
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boot lid
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soft-top cover
and some internal harnesses in components, e.g. electrically operated seat.
The wiring harnesses are in contact with each other through connectors, ensuring that all electrical components get the necessary currents, voltages and
signals.
Power distribution panels
All power distribution panels are included in the wiring harnesses. In the engine bay there are
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MAXI fuse board 501
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engine bay fuse board 342a
-
engine bay relay board 342b
The engine bay fuse and relay boards 342a and 342b are integrated into the same unit.
The dashboard fuse and relay boards form two separate units:
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fuse board 22a
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relay board 22b LHD
-
relay board 22b RHD
In the Convertible model there are another two relay boards, one at each of the rear-seat speakers:
-
left-hand side 519LH
-
right-hand side 519RH
All fuses are mounted on fuse boards. Only the passenger-seat relay is located apart from the relay boards.
Power supply
The power supply system of the car is divided into:
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Battery feed
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+30 feed
-
+15-feed
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+54-feed
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+X-feed
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+B-feed.
Battery feed
Besides the maxi fuse board 501, battery voltage is also fed directly to the starter motor, generator, both lighting relays and a number of fuses in the main
fuse board 342a, see Power supply +30, PAGE 1
These leads are unfused and great care must therefore be exercised when measuring the voltage in these circuits.
The charging system is described in the service category "Charging system"
