Editing Z31/Alarmsystem php

{{ImportedFrom|site=Xenonzcar|title=Z31 Factory Alarm System Information|url=https://dev.z31library.com/xenonzcar_archive/z31/Alarmsystem.php.html|archive=https://dev.z31library.com/xenonzcar_archive/z31/Alarmsystem.php.html|fetched=2026-05-15}}

== Z31 Factory Alarm System Information ==

The Nissan Anti-theft System Is a very simple system but can be rather finicky. Specific sensory “conditions” must be present or the system will not arm and may not shut off if it does.

''WARNING'' - Do this modification at your own risk. We Are not responsable for any issues of your own doing.

=== Troubleshooting the Factory Alarm System ===

The Factory Alarm has several switches through the car. One on each door, One on the Hatch latch and one under the hood.

To work the circuit must be grounded to sound the alarm when an entery way is opened. This is One of the common points of failure, the "Door Closed" switch. In it's location it is exposed to water and Winter salt which can corrode the contacts preventing it from alarming when the door is opened. This one in particular has a hole worn through the rubber boot exposing the switch to the elements. As you can see the switch plunger has poked through the hole.


https://dev.z31library.com/xenonzcar_archive/z31/images/Alarm%20system/doorsensor.gif



https://dev.z31library.com/xenonzcar_archive/z31/images/Alarm%20system/doorsw1.gif


This is the door switch. In it there are actually two separate sets of switch contacts. One for the dome light and one for the anti-theft system. The one furthest back from the plunger with the red wire is for the alarm. The other contact with the black wire and red stripe if for the dome light. Both share a common black ground wire. The type of switch contacts are called "Self scrubbing". This means that the contact surfaces scrape or "scrub" themselves clean each time they close preventing corrosion buildup. This also means they do gradually wear out. A well designed switch is a balancing act between excess wear and corrosion failure. However, with a hole in the boot, as in the above image, corrosion can build rapidly causing the dome light or the alarm to not activate.

=== Hood Switch ===

The engine hood switch works much the same. When the hood is opened the switch closes and the alarm sounds. Replacing the hood during body work or making any adjustments to the fit of the hood and affect this switch. This switch can also fail if esposed to the elements. This switch must be “open” to arm the system.

https://dev.z31library.com/xenonzcar_archive/z31/images/Alarm%20system/hoodsensor.gif


=== Hatch Switch ===

The “Hatch Open” switch is a little more sophisticated. Unlike the other switches this one is incorporated directly into the latch assembly. Being in what is essentially the interior of the car this switch is less likely to fail due to corrosion. This switch must also be “open” to arm the system.

https://dev.z31library.com/xenonzcar_archive/z31/images/Alarm%20system/hatchsensor.gif


Hope this helps with troubleshooting the Factory Alarm in your Z.

[[Category:Imported from Xenonzcar]]