Normal Operation

The Body Control Module (BCM) controls the perimeter alarm system and based on inputs either arms, disarms or activates the alarm. When the alarm is activated, the BCM sounds the horn and flashes both the turn signals and courtesy lamps in regular intervals. The BCM receives inputs for the door lock status, hood ajar, door ajar and the keyless entry keypad. The BCM also receives signals from the Remote Keyless Entry (RKE) transmitters.

For the perimeter alarm to arm and provide a flash of the turn signals, the following conditions must be met:

• Ignition must be OFF
• The hood closed
• All doors closed
• An electronic lock command received from an RKE transmitter, keyless entry keypad, or door lock control switch (front door opened and then shut after lock is pressed).

Once all the conditions are met, the alarm system enters a pre-arm phase and begins a 20-second countdown. After 20 seconds have passed and no unlock command is received or any hood or door is opened, the perimeter alarm arms.

The perimeter alarm is activated when:

• any passenger door or the hood is opened without an electronic unlock command from an RKE transmitter or keyless entry keypad received first.
• the driver door is opened without an unlock command from an RKE transmitter or keyless entry keypad received first and the 12 second countdown has expired.
• the ignition is turned to the RUN position without a valid Passive Anti-Theft System (PATS) key read received.

This pinpoint test is intended to diagnose the following: 

• Door ajar input
• Hood ajar input
• Turn signals
• Keyless entry keypad concern
• RKE transmitter concern
• BCM