Vehicle Security System Alarm Operation

The vehicle security system is triggered by

opening a door
opening the hood or the trunk lid
detection of battery disconnect and connect.

Once the vehicle security system is in armed phase, if the smart entrance control unit receives a ground signal at terminal 1, 2, 3 (door switch), 13 (trunk room lamp switch) or 6 (hood switch), the vehicle security system will be triggered. The headlamps flash and the horn sounds intermittently.

Power is supplied at all times

through 10A fuse (No. 61 located in fuse and fusible link box)
to vehicle security horn relay-1 terminals 1 and 3, and
to vehicle security horn relay-2 terminal 1
through 10A fuse (No. 57, located in fuse and fusible link box)
to horn relay terminal 2.

Power is also supplied at all times

through 15A fuse (No. 68, located in fuse and fusible link box)
to headlamp LH relay terminal 3,
through 20A fuse (No. 54, located in fuse and fusible link box)
to headlamp LH relay terminals 1 and 6,
through 15A fuse (No. 69, located in fuse and fusible link box)
to headlamp RH relay terminal 3, and
through 20A fuse (No. 55, located in fuse and fusible link box)
to headlamp RH relay terminals 1 and 6.

When the vehicle security system is triggered, ground is supplied intermittently

to headlamp LH relay terminal 2 from smart entrance control unit terminal 21 and
to headlamp RH relay terminal 2 from smart entrance control unit terminal 59
through smart entrance control unit terminals 43 and 64.
through body grounds M9, M25 and M87.

When headlamp relays (LH and RH) are energized and then power is supplied to headlamps (LH and RH). The headlamps flash intermittently.

When the vehicle security system is triggered, ground is supplied intermittently

from smart entrance control unit terminal 42
to vehicle security horn relay-2 terminal 2.

When vehicle security horn relay-2 is energized, ground is supplied intermittently

to vehicle security horn relay-1 terminal 2, and
to horn relay terminal 1.

When vehicle security horn relay-1 and horn relay are energized, then power is supplied to vehicle security horn and horn.

The horn sounds intermittently.

The alarm automatically turns off after 50 seconds but will reactivate if the vehicle is tampered with again.