Crossfire SRT-6 V6-3.2L SC VIN N (2005)
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 SKREEM module sends a signal to the Body Control Module. The Body Control Module then sends a 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 module. 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 module.
After unlocking with the remote control, the locks will be relocked if either door is not opened within 40 seconds, the key is not inserted into the
ignition switch, or the interior power door lock switch is not actuated. The CLP/SSM reads the signals (door contacts, liftgate/decklid, 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
