Anti-Theft - Perimeter, With Intelligent Access (IA): Notes
Overview
The perimeter alarm system protects the vehicle from unauthorized entry by sounding the horn and flashing both the turn signals and courtesy lights when an unauthorized entry occurs. The horn and lights are active for 30 seconds. After 30 seconds, the horn stops sounding, but the lights continue to flash for up to 5 minutes.
The panic alarm operates similar to the perimeter alarm, but is only controlled by the panic button on a RKE transmitter. For information on the panic alarm operation, refer to REFER to Handles, Locks, Latches and Entry Systems - With Intelligent Access (IA) .
System Operation
System Diagram
Network Message Chart
BCM Network Message Chart
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Passive entry control data | RFA module | Provide the BCM with the Intelligent Access (IA) key data. The data contains information such as if an Intelligent Access (IA) key has been detected, how many were detected, and if it is a programmed key. |
| Passive entry_control code | RFA module | Provide the BCM with RKE commands such as lock or unlock. |
| Passive entry_fob number | RFA module | Provide the BCM with which specific programmed Intelligent Access (IA) key was used. |
| Passive entry_lock request | RFA module | Used in conjunction with the Passive entry_lock status message. Provides the BCM with the input (keyless entry keypad, RKE transmitter, etc.) that created the lock or unlock request. |
| Passive entry_lock status | RFA module | Provides the BCM with the status of the last lock or unlock command. |
IPC Network Message Chart
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Perimeter alarm chime request | BCM | Used by the IPC to sound the perimeter alarm chime and display TO STOP ALARM START VEHICLE in the message center. |
Anti-Theft - Perimeter
Arming the Perimeter Alarm
The perimeter alarm is ready to arm any time the ignition is off. Any of the following pre-arms the alarm system:
- 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, or 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 is displayed in the message center. If the perimeter alarm is not disarmed within the 12-second delay, the alarm is activated.
The perimeter alarm is activated when:
- any passenger door, liftgate, or the hood is opened without first receiving an electronic unlock command from a RKE transmitter or keyless entry keypad.
- the driver door is opened without first receiving an unlock command from a RKE transmitter, keyless entry keypad, or Intelligent Access (IA) command and the 12-second delay has expired.
- the passenger door or liftgate is opened without first receiving an Intelligent Access (IA) command.
- the ignition is transitioned 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 can be disarmed by:
- pressing the unlock button on a programmed RKE transmitter.
- pressing the liftgate release button on a programmed RKE transmitter.
- unlock the driver or passenger door with the Intelligent Access (IA) feature.
- open the liftgate with the Intelligent Access (IA) feature.
- a programmed Intelligent Access (IA) key is inside the vehicle and the start/stop switch is pressed.
- 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.
Intelligent Access (IA) Key Disable
For security reasons, when the perimeter alarm enters an armed state, the RFA module searches the interior of the vehicle for any programmed Intelligent Access (IA) keys. If the RFA module detects any programmed Intelligent Access (IA) keys inside the vehicle when the perimeter alarm is armed, it disables the Intelligent Access (IA) key. The RKE and the Intelligent Access (IA) functions of that key still operate, but the RFA module ignores any start command associated with that key. The disabled Intelligent Access (IA) key is enabled when the perimeter alarm is disarmed.