Vehicle Security (Theft Warning) System

System Description

DESCRIPTION
Setting the vehicle security system

Disarmed phase
- When the vehicle is being driven or when doors or trunk lid is open, the vehicle security system is set in the disarmed phase on the assumption that the owner is inside or near the vehicle.

Pre-armed phase and armed phase
- The vehicle security system turns into the "pre-armed" phase when hood, trunk lid and all doors are closed and locked by electronic key. The security indicator lamp illuminates for 30 seconds. then, the system automatically shifts into the "armed" phase.

Canceling the set vehicle security system
When one of the following operations is performed, the armed phase is canceled.
1. Unlock the doors with the key or the key fob.
2. Open the trunk lid with the key or the key fob. When the trunk lid is closed after opening the trunk lid with the key fob, the system returns to the armed phase.

Activating the alarm operation of the vehicle security system
Make sure the system is in the armed phase.

When one of the following operations is performed, the system sounds the horns and flashes the head-lamps for about 50 seconds.
1. Engine hood or any door is opened before unlocking door with key or key fob.
2. Door is unlocked without using key or key fob.
3. Trunk lid is opened without using key or key fob.

POWER SUPPLY
Power is supplied at all times
- through 10 A fuse [No.19, located in the fuse block (J/B)]
- to security indicator lamp terminal 1 and
- to key switch and key lock solenoid terminal 3.

Power is supplied at all times
- through 50 A fusible link (letter f, located in the fuse and fusible link box) - to BCM terminal 7.

With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in the fuse block (J/B)]
- to BCM terminal 36.

INITIAL CONDITION TO ACTIVATE THE SYSTEM
The operation of the vehicle security system is controlled by the doors, hood and trunk lid.

To activate the vehicle security system, BCM must receive signals indicating the doors, hood and trunk lid are closed and the doors are locked.
When a door is open, BCM terminal 10, 11 or 14 receives a ground signal from each door switch.
When front door LH is unlocked, BCM terminal 74 receives a signal from terminal 14 of main power window and door lock/unlock switch.
When front door RH is unlocked, BCM terminal 74 receives a signal from terminal 11 of front power window switch RH.

When the hood is open, IPDM E/R receives a ground signal
- from hood switch terminal 2
- to IPDM E/R terminal 51
- through body grounds E15 and E24.

The IPDM E/R then sends a signal to the BCM through the CAN SYSTEM.

When the trunk lid is open, BCM terminal 18 receives a ground signal
- from terminal 1 of the trunk lamp and trunk release solenoid switch
- through body grounds B7 and B19.

VEHICLE SECURITY SYSTEM ALARM OPERATION
The vehicle security system is triggered by
- opening a door
- opening the trunk lid
- opening the hood
- unlocking door without using the key or key fob.

The vehicle security system will be triggered once the system is in armed phase,
- when BCM receives a ground signal at terminals 10, 11, 14 (door switch), 18 (trunk lamp and trunk release solenoid switch) or receives a signal from the IPDM E/R (hood switch).

Power is supplied at all times - to horn relay terminal 1
- through 15 A fuse (No. 25, located in fuse and fusible link box).

When the vehicle security system is triggered, ground is supplied intermittently
- from IPDM E/R terminal 53
- to headlamp high relay and
- to horn relay terminal 2.

The headlamps flash and the horn sounds intermittently.
The alarm automatically turns off after 50 seconds, but will reactivate if the vehicle is tampered with again.

VEHICLE SECURITY SYSTEM DEACTIVATION
To deactivate the vehicle security system, a door or the trunk lid must be unlocked with the key or key fob. When the key is used to unlock a door, BCM terminal 74 receives signal - from terminal 14 of the main power window and door lock/unlock switch.

When the key is used to unlock the trunk lid, BCM terminal 17 receives a ground signal from terminal 1 of the trunk key cylinder switch (unlock switch).
When the BCM receives either one of these signals or unlock signal from key fob, the vehicle security system is deactivated. (Disarmed phase)

PANIC ALARM OPERATION
Remote keyless entry system may or may not operate vehicle security system (horn and headlamps) as required.

When the remote keyless entry system is triggered, ground is supplied intermittently
- from IPDM E/R terminal 53
- to headlamp high relay and
- to horn relay terminal 2.

The headlamp flashes and the horn sounds intermittently.
The alarm automatically turns off after 30 seconds or when BCM receives any signal from key fob.

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.