Crossfire V6-3.2L VIN L (2004)
Alarm Module: Description and Operation
SECURITY SYSTEM MODULE
The Central Locking Pump/Security System Module (3) uses a combination of electrical wires (2) and air pressure/vacuum lines (1). The Central
Locking Pump/Security System Module is located in the right rear of the luggage compartment underneath the trunk floor covering (4). It is wrapped in a
sound deadening material in order to operate quietly without disturbing the vehicle operator.
The Central Locking Pump/Security System Module controls the air and vacuum lines that handle the locking and unlocking of the vehicle doors, the
liftgate, and the fuel tank door.
VEHICLE LOCKING/UNLOCKING
To unlock, the Body Control Module is actuated by the SKREEM. The Body Control Module then sends the signal to the Central Locking
Pump/Security System Module (CLP/SSM) via the Controller Area Network (CAN) Bus. The CLP/SSM pump motor starts running and supplies air
pressure. The door lock actuators are pressurized. When a pressure threshold is reached in the system, the pump is switched off by an internal pressure
switch. The pressure in the system is then released by the CLP/SSM and the unlocking operation is completed. The locking procedure is accomplished in
a fashion opposite to the unlocking operation. However, the next time the remote control button is pressed, the CLP/SSM is also actuated by connecting
it to ground by the second control lead on the SKREEM. The direction of rotation for the CLP/SSM pump motor is reversed, thereby providing the
vacuum required to lock. In order to avoid unlocking the vehicle unintentionally, the vehicle is relocked by the CLP/SSM via the SKREEM. Relocking is
accomplished after unlocking with the remote control when: a door is not opened within 40 seconds, the key is not inserted into the ignition lock, the
interior power door lock switch is not actuated, only the liftgate is opened after unlocking. The CLP/SSM reads the signals (door contacts, trunk lid,
interior power door lock switch) and actuates the power door lock actuators. The vehicle security alarm is also activated by the relocking function.
AUTOMATIC LOCKING/UNLOCKING
Upon reaching a speed of 15 km/h (9 MPH), the vehicle doors are locked automatically. The fuel tank flap remains unlocked. If, after automatic
locking, the vehicle is unlocked with the interior power door lock switch, this state is maintained until a door is opened or until the ignition is switched
off. Automatic locking is accomplished again only upon reaching the specified speed. The logic circuitry for this function is integrated into the
CLP/SSM. The automatic locking function can be activated or deactivated with the DRB III(R). An alternative is to use the interior power door lock
switch with the ignition switched on by pressing and holding the door lock switch for more than 5 seconds in either the lock (auto locking switched on)
or unlock (auto locking switched off) position. The alternative of enabling/disabling the auto locking system by using the interior power door lock switch
can also be inhibited with the DRB III(R).
EMERGENCY UNLOCKING
In the event of a vehicle collision, the doors are unlocked automatically by a crash sensor integrated into the CLP/ SSM. The doors are unlocked after a
delay time of 8 to 11 seconds. The emergency unlocking function interrupts all functions performed by the CLP/SSM, which are reactivated only after
interrupting the ignition. The emergency unlocking function is only active when the vehicle is unlocked from the outside.
VEHICLE RELOCKING
In order to avoid unlocking the vehicle unintentionally, the vehicle is relocked by the CLP/SSM via the SKREEM. Relocking is accomplished after
unlocking with the remote control when: a door is not opened within 40 seconds, the key is not inserted into the ignition lock, or the interior power door
lock switch is not actuated. The CLP/SSM reads the signals (door contacts, interior power door lock switch) and actuates the power door lock actuators.
The vehicle security alarm is also activated by the relocking function.
