Chrysler 2005 Crossfire SRT6 Service Manual page 1555

VEHICLE THEFT SECURITY - SERVICE INFORMATION 8Q - 49
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VEHICLE THEFT SECURITY - SERVICE INFORMATION
DESCRIPTION
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 oper-
ate 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.
OPERATION
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.