Help with Viper Alarm and Hood Pin...Alarm Guru's please come in
 

I had a Viper 5900 Alarm installed on my G35. The installer connected a wire to my factory hood pin to the green/black wire.

About 50% of the time when I go to arm my car it's completely fine. It beeps once, I get the one confirmation beep on my keyfob.

The other half of the time I get a 2nd beep when I arm it and a 2nd beep on my key fob with the hood icon flash meaning it's bypassing the hood pin. I will then unarm the car...then when I rearm it beeps once as normal.


Can anyone tell me why sometimes it wants to bypass my hood pin? I haven't noticed any pattern of events that gives me a 2nd beep (bypassed hood).

Any ideas?

Make sure all doors are closed before trying to arm it.

I used to have a Viper 671XV, and would notice this to happen if I would try and arm it as the door is shutting or if my passenger(s) have yet to close their door.

I'm sure the car is fully shut before arming. Does the factory hood pin send the right signal the viper brain is looking for?

Are you sure that the dome light is off?

The alarm will only bypass the zone as long as the zone is tripped. As soon as it returns to its 'normal' state the zone will become active again.

On some cars, if the door trigger is hooked to the dome light there will be a slight delay befor the door triggers will be active, because the dome light stays on a little while after the car is shut off.

the shop i had my alarm installed also had the same problem. with the stock hood pin (connected to factory alarm) it was still reading some voltage when depressed.

to solve the problem, they disconnected the hood pin from the factory alarm. now it is only connected to the after market alarm. i haven't had problems since.

They should be, at a bare minimum, diode isolating the hood pin from the OEM alarm to the aftermarket alarm.