Vehicle Security System Alarm Operation

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle security system is triggered by

Opening a driver or passenger side door
Opening the back door (for Coupe)
Opening the trunk (for Roadster)
Opening the hood
Detection of battery disconnect and connect.

The vehicle security system will be triggered once the system is in armed phase,

When BCM receives a ground signal at terminals 12, 62 (door switch), 57 (back door switch or trunk room lamp switch), or IPDM E/R receives a ground signal at terminal 56 (hood switch).

Power is supplied at all times

To horn relay terminal 2
Through 15A fuse (No. 35, located in the fuse and fusible link box).

When the vehicle security system is triggered, ground is supplied intermittently to both headlamp relay and horn relay.

When both headlamp relay (with built-in IPDM E/R) and horn relay are energized and then power is supplied to headlamps (high beam and low beam) and horns (HIGH and LOW).

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.