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Vehicle Access
Description
General
This description covers all aspects of vehicle locking, alarm
systems and engine immobilisation. These systems are all
controlled by Body Control Module (BCM).
Vehicle Locking System
Door Latches — General
When Central Door Locking (CDL) is applied to the doors,
the external door handles will not open the doors. The doors
can be opened from inside the vehicle.
The lock motors are protected by an overheat protection
function, which can suspend lock motor operation if a high
number of motor operations occurs within a given period.
Driver's Door Latch
The driver's door latch comprises a door open microswitch
and a lock motor. The latch is located inside the door and
secured with screws. The latch secures the door in the closed
position on a striker which is secured to the B/C post.
The lock motor can be driven in either direction to lock
or unlock the door. A microswitch is attached to the latch
mechanism and is in an open circuit condition when the door
is closed. When the door is opened, the latch mechanism
operates the microswitch causing a short circuit to earth. This
completed earth path is detected by the BCM and generates a
driver's door open message in the instrument pack or triggers
the alarm system (if armed).
The driver's door is also fitted with a key barrel to allow the
driver to open the doors using the emergency key (contained
in the handset). The key barrel houses a switch assembly which
comprises two microswitches. One microswitch is operated
when the key is turned to the unlock position and the second
is operated when the key is turned to the lock position. Each
microswitch is normally in an open circuit condition. When
operated, each microswitch causes a short circuit to earth.
The BCM detects the completed earth path and determines
which microswitch is operated. The BCM then operates the
door lock motors to lock or unlock the doors as applicable.
Passenger and Rear Door Latches
The passenger and rear door latches each comprise a door
open microswitch and a lock motor. Each rear door latch
assembly has a child lock facility. A small lever on the inside
of the door activates the child lock, preventing the rear door
from being opened from inside the vehicle.
Boot Lock
The boot lock comprises a boot open microswitch and a lock
motor. The boot release is located on the lower inside edge
of the boot lid panel and secured with three screws. The lock
motor is driven in one direction to move the latch mechanism
Version 2.0
and open the boot lid. The latch secures the boot lid in the
closed position on a striker which is secured to the rear boot
panel. The boot open microswitch is connected to the latch
and is open circuit when the boot lid is closed. When the boot
lid is opened, the microswitch contacts close, completing an
earth path to the BCM. This completed earth path is detected
by the BCM and generates a boot lid open message in the
instrument pack or triggers the alarm system (if armed).
Master Locking Switch
The master locking switch is a momentary action switch
located on the front console below the heating controls.
When the switch is operated a momentary earth path to the
BCM is completed. The BCM interprets the completed earth
path as a request either to lock or unlock all of the doors at
the same time.
Fuel Flap Release
The fuel flap release is a motor driven linear actuator located
inside the RH rear wing. When the driver's door is locked, the
fuel filler flap is also locked.
Inertia Switch
The inertia switch is located behind the fascia to the left of
the steering wheel. The switch is mounted vertically and has a
reset button on its top surface. If the alarm system is disarmed
when the supply is removed, the BCM will operate all door lock
motors to unlock all of the doors. The BCM will also initiate
the hazard warning lights to start flashing, cut the power supply
to the fuel pump and illuminate the interior lamps. The inertia
switch can be reset by pressing the button on the top of the
switch.
Safety and Restraints
885
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