Vehicle Security System Alarm Operation

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle security system is triggered by

opening a door
opening the hood or the glass hatch
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 (glass hatch 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 7.5A fuse (No. 52, located in fuse and fusible link box)
to horn relay terminals 1 and 3.
through 10A fuse (No. 54, located in fuse and fusible link box)
to horn relay terminal 6.
through 15A fuse (No. 60, located in fuse and fusible link box)
to headlamp LH relay terminals 1 and 3,
through 15A fuse (No. 59, located in fuse and fusible link box)
to headlamp RH relay terminals 1 and 3.

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

to headlamp (LH and RH) relay terminal 2 from smart entrance control unit terminals 21 and 59
through smart entrance control unit terminals 43 and 64.

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 horn relay terminal 2.

When horn relay are energized, then power is supplied to horn.

The horn sounds intermittently.

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