Anti-Theft — Without Intelligent Access (IA)

Overview

The perimeter alarm system deters unauthorized entry to the vehicle by sounding the horn and flashing all the turn signals and interior courtesy lamps when an unauthorized entry occurs. The horn and lamps activate for 30 seconds. After 30 seconds, the horn stops sounding, but the lamps continue to flash for up to 5 minutes.

The panic alarm operates similar to the perimeter alarm, but is only activated by the panic button on the RKE transmitter. Refer to Section 501-14A for panic alarm operation.

System Operation

System Diagram

Network Message Chart

  BCM Network Input Messages

  IPC Network Input Messages

Perimeter Alarm

The BCM controls the operation of the perimeter alarm. It monitors inputs from the RKE system (includes the keyless entry keypad), the power door lock system, PATS and the ignition status to determine when to arm the perimeter alarm.

The BCM monitors all of the door ajar switches, the liftgate ajar switch input, the hood ajar switch and the ignition status to determine when to activate the perimeter alarm. When the BCM detects an input indicating an unauthorized entry into the vehicle, the BCM activates the perimeter alarm by sounding the horn and flashing all the turn signals and interior courtesy lamps at regular intervals.

The BCM monitors the RKE system (includes the keyless entry keypad) and PATS to determine when to disarm the perimeter alarm.

Arming the Perimeter Alarm

The perimeter alarm is ready to arm any time the ignition is off. The alarm system pre-arms when:

• pressing the lock button on a RKE transmitter.
• pressing the door lock control switch to the lock position with the door open, then closing the door.
• touching the 7/8 and 9/0 buttons simultaneously on the keyless entry keypad.

Once the system is pre-armed, there is a 20-second countdown before the perimeter alarm is armed. Each entry point to the vehicle (hood, door and liftgate) is armed separately and must be closed before that entry point begins the 20-second countdown to become armed. If all entry points are closed, the turn signals flash indicating that all entry points are entering the 20-second countdown

Perimeter Alarm Activation

The perimeter alarm has a 12-second delay when the driver door is unlocked and opened using a key in the door lock cylinder. During the delay, a chime sounds and "TO STOP ALARM START VEHICLE" displays in the message center. If the perimeter alarm is not disarmed within the 12-second delay, the alarm activates.

The perimeter alarm activates when:

• the driver door is opened without first receiving an unlock command from a RKE transmitter or keyless entry keypad, and the 12-second delay has expired.
• any passenger door, the liftgate, or the hood is opened without first receiving an electronic unlock command from a RKE transmitter or keyless entry keypad.
• the ignition transitions to RUN without a valid PATS key read received.

The perimeter alarm only activates 10 times per arming cycle. After that, the alarm does not activate. To enable the perimeter alarm again, disarm the perimeter alarm and then arm it again.

Disarming the Perimeter Alarm

The perimeter alarm disarms when:

• pressing the unlock button on a programmed RKE transmitter.
• pressing the liftgate release button on a programmed RKE transmitter.
• using a programmed key to change the ignition to RUN.
• entering the correct vehicle unlock code on the keyless entry keypad.

The perimeter alarm can be deactivated by pressing the panic button on a RKE transmitter. All of the lamps stop flashing and the horn stops sounding, but the alarm is still armed.

Component Description

Hood Ajar Switch

The hood ajar switch is a single pole switch that is normally closed when the hood is closed, routing the voltage signal to ground. When the hood is opened, the hood ajar switch opens, interrupting the signal to indicate an open hood.

The BCM sends a voltage reference signal to the hood ajar switch, and based on the input, the BCM determine if the hood is open or closed.