9-3 (9440) L4-2.0L Turbo (2007)
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Power Trunk / Liftgate Lock Actuator: Description and Operation
Bootlid Central Locking System Motor (184H)
Location
Main task
^
Unlock luggage compartment.
^
Use of a switch to indicate whether the boot lid is open or closed. The value is used for the antitheft alarm function, for luggage compartment
lighting and to inform the driver that the boot lid is not closed. The body control module sends the status of the switch on the bus.
The central locking system motor has one electric motor, which via a worm gear is connected to the lock mechanism. The motor has 2 connections. The
switch contains a single pole breaker and 2 resistors. When the bootlid is closed the breaker is open and the resistance is 1.8 k Ohms. When the bootlid is
opened the breaker makes and a resistance of 620 Ohms is connected in parallel with the original resistance. The total resistance then drops to 460
Ohms.
Connection 4D/CV
Motor
The motor is connected with 2 cables to the rear electrical centre. The rear electrical centre unlocks by sending battery voltage on the cables. In the idle
position the circuit is dead. The wiring harness to the motor has 6 extra dummy cables in order to impede car theft. All cables are black.
