Principles Of Operation

Anti-Theft

Principles of Operation

The Driver Door Module (DDM) monitors the door ajar switches, while the Lighting Control Module (LCM) monitors the hood switch, the door disarm switch and the luggage compartment lid disarm switch. The DDM and the LCM communicate this information to each other over the Standard Corporate Protocol (SCP) communication network and 20 seconds after each of the inputs are closed, the LCM arms the perimeter alarm for each individual input. When the DDM or the LCM receive a signal from one or more of the monitored switches indicating an unauthorized entry into the vehicle, the LCM intermittently grounds the horn relay and also intermittently sends voltage to the parking lamps. The horn relay closes, supplying voltage to the horn. The LCM cycles the ground to the horn relay and voltage to the parking lamps, on and off in regular intervals, while the system is activated. An activated alarm can either be deactivated or disarmed. Pressing the PANIC button on the Remote Keyless Entry (RKE) transmitter can deactivate the perimeter alarm, but cannot disarm the alarm. The perimeter anti-theft feature (or an activated alarm) can be disarmed when either an unlock request is made through the RKE transmitter or if the driver door is unlocked with a key, or the ignition switch is turned to the ON position using a key, or if the correct code is entered on the keyless entry keypad.

The LCM monitors the key-in-ignition switch and does not allow the perimeter anti-theft feature to arm until after the key is removed from the ignition lock cylinder, all doors, hood, luggage compartment lid are closed, and 20 seconds have elapsed after locking the vehicle. After all of these criteria have been met, the anti-theft feature arms. From the time each individual input is closed, to the time the perimeter alarm is armed for that particular input, is the "pre-arm phase". The pre-arm phase is separate for each individual input. If the door lock control switch is pressed to lock with the accompanying door open (driver door), all of the inputs that are already closed (hood, luggage compartment lid and passenger doors) immediately begin their pre-arm phase. This causes the hood, luggage compartment lid and passenger doors to be armed a few seconds before the driver door. The perimeter alarm arms in stages in relation to which input was closed first after the arming command was given. With the passenger doors all on the same door ajar circuit, if the LH front door was open and the arming command was given, the hood, luggage compartment lid and the driver door would all begin their pre-arm phase first and after the LH front door was closed, then the passenger doors would begin their pre-arm phase.

If equipped with the Liftgate/Trunk Module (LTM), the LTM monitors the luggage compartment lid ajar switch. The switch status is provided to the LCM by the LTM through a hardwired circuit. If the LTM does not receive a ground signal, the LCM does not arm the alarm for the luggage compartment lid only.

Panic Alarm

The panic alarm is operated from the RKE transmitter. Pressing the PANIC button on the RKE transmitter causes the horn to sound and the high beam headlamps, parking lamps and courtesy lamps to flash for 2 minutes and 45 seconds. The panic alarm can be activated when the perimeter alarm system is armed or disarmed with the ignition in the OFF position. The system is only disabled when the ignition switch is in the ON, ACC or START positions. Deactivating a triggered panic alarm is done by pressing the PANIC button again.