Description And Operation: Anti-Theft

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The integrated key head transmitter (IKT) key is a standard passive anti-theft system (PATS) key with a remote keyless entry (RKE) transmitter incorporated into the key head. For additional information on PATS, refer to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) article. For additional information on RKE, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS article.

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

The perimeter anti-theft system consists of the following:

Door ajar switches
Door disarm switch
Exterior lamps
Hood switch
Horn
Key-in-ignition switch
Keyless entry keypad (if equipped)
Luggage compartment lid disarm switch
IKT key
Smart junction box (SJB)

The perimeter anti-theft feature is controlled by the SJB. The alarm can be armed by using 1 of 3 commands:

Pressing the LOCK button on the IKT key
Pressing the door lock control switch to LOCK with the accompanying door open, then close the door
Pressing the 7/8 and 9/0 buttons simultaneously on the keyless entry keypad (if equipped)

The SJB monitors the door ajar switches, the hood ajar switch, the door disarm switch and the luggage compartment lid disarm switch (all doors, hood, luggage compartment lid must be closed and the key must be out of the ignition switch). The SJB arms the perimeter alarm after all of the inputs are closed for 20 seconds. From the time each individual input is closed, to the time the perimeter alarm is armed for that particular input (approximately 20 seconds), 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, all of the inputs that are closed (hood, luggage compartment lid) immediately begin their pre-arm phase. After the door that was open is closed, that door begins its pre-arm phase. This causes all other entry points to be armed a few seconds before the last open entry point. The perimeter alarm arms in stages in relation to which input was closed first after the arming command was given. In the event of an unauthorized entry, the alarm will be activated by the SJB. When the alarm is activated, the SJB intermittently grounds the horn relay, causing the horn to sound in regular intervals, and intermittently powers the turn signals, causing the turn signals to flash in regular intervals.

The perimeter alarm can be disarmed only by:

pressing the UNLOCK button on the IKT key.
turning the door lock cylinder to the UNLOCK position.
using a valid programmed key to turn the ignition switch to the ON position.
entering the correct vehicle unlock code on the keyless entry keypad (if equipped).

The perimeter alarm can be deactivated (not disarmed), by pressing the PANIC button on the RKE transmitter. This action will not disarm the alarm, but will stop the alarm from activation (horn sounding and turn signals flashing). The perimeter alarm will continue to be armed.