Printer Friendly Forum Posts - trunk release to trigger alarm

I have a 02 cavalier that has an interior trunk release button. What I want to do is disconnect that button so that it wont pop the trunk. But then I want to rig the button so that if someone smashes in the window and presses that button, the alarm will trigger. Now I will be installing a glass break sensor to help protect the windows, but with those you sometimes dont know if they will work.

since most alarms have a (-) trigger inputs to set off the alarm, simply one wire of the switch to ground and the other to the alarm. or get creative and use a relay and the ground when armed (if your alarm has one, it should) so you can still pop the trunk with the switch unless the alarm is armed

Ok. Well I wired aux 1 to the trunk release button. That wire in the vehicle is BLACK/ white and is positive polarity. So would I simply just wire up a relay off that wire to the ground when armed wire?

85 - ground when armed
86 - +12v aux 1
87 - +12v
87a- switch side of BLACK/ white in cavalier
30 - motor side of BLACK/ white in cavalier

if your aux 1 is negative output then you'll need another relay to change it to a positive output. if you already have a relay changing it to positive then you're set. also if the alarm has a +12v input for door triggers then you can still connect pin 30 of the above relay to the alarm so it will set off the alarm if someone presses the trunk button when armed

Ok this is exactly what I have. The BLACK/ white wire for the trunk release is positive. The aux 1 on my alarm is negative so I used a relay to change the output to positive. I have the positive door trigger wire free since I dont need it for my doors. So would I use that relay and change it up alittle or need another relay. Please tell me how to wire up the relay. Thanks

you should just be able to wire the switch side of the trunk release button to the alarm's positive door trigger input. I would just save yourself the trouble, and save you trunk release button and just simply pick up a glass break sensor. That way they dont have to press the trunk button, as soon as they break the glass the alarm is set off.

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Kenny
Owner / Technician
KKD Garage LLC
Albany, NY 12205

but i want this as a backup just incase the glass sensor doesnt work. I have tinted windows and the glass breaking might not set off that sensor.

i hope the info i gave you is clear, if not dont hesitate to ask.

DISABLE TRUNK POP WHEN ARMED
RELAY 1
85 - ground when armed
86 - constant 12v
87a - trunk wire (-) switch side
87 - trunk wire (-) motor side

CONVERT POLARITY OF TRUNK WIRE TO TRIGGER ANOTHER RELAY TO ACTIVATE ALARM
RELAY 2
85 - constant 12v
86 - trunk release (-) switch side
87 - high current 12v
30 - to Relay 3, PIn 85

USING FACTORY TRUNK RELEASE BUTTON TO TRIGGER ALARM ONLY WHEN IT IS ARMED
RELAY 3
85 - to Relay 2, Pin 30
86 - ground when armed
87 - high current ground
30 - to alarm instant trigger wire eg door pin, hoop pin, hatch pin.

make sure the GROUND WHEN ARMED ARE DIODE ISOLATED !

why not just hook up the trunk pin. i will trigger at the same time

i would say the force of someone breaking the glass of your car would be enough to trigger the shock sensor on your alarm....

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if at first u dont succeed........ lower ur standards

very true stuntinonabusa but I dont have the shock sensor set up to trigger my alarm. I only have it wired to set off the pre warning chirps because my shock sensor would either be way too sensitive or not enough. Is there a way to wire a relay that will disable the trunk release button when armed?

yea yo uwill break continuit on it.

85 - constant 12v
86 - ground when armed from alarm system.
87 - N/C
87a - trunk wire button side
30 - trunk wire trunk solenoid side

Thanks Tedmond. I have a relay for my trunk release. I have my alarm programed so that if I use my remote to pop the trunk, the alarm gets disarmed at the same time. Would I put this relay (one you mentioned) on the button side of the trunk release relay or on the trunk solenoid side?

well assuming you placed it at the button, the relay setup i showed you, just wire that in normally. Then take the 12v trigger (aux 1) from your unit and connect that 12v wire to pin 30.

so to break it down for you

negative aux from unit to power relay for trunk release
85 - constant 12
86 - neg aux 1 from alarm unit
87 - high current 12v
30 - to relay 2 Pin 30. or to pin 87 (only if the unit disarms befor trunk pops.

BREAKING CONTINUITY ON BUTTON FOR TRUNK
85 - constant 12v
86 - ground when armed from alarm system.
87 - N/C
87a - trunk wire button side
30 - trunk wire trunk solenoid side

I was really hoping I could just keep my trunk release relay in tact. I have the relay because my aux 1 output is negative and the trunk relase wire is positive so I use the relay to convert polarity. I was thinking, couldnt I just wire a relay up, have it connected to the ground when armed output and place the relay between the trunk release relay and the button? I mean if I was to use the remote to pop the trunk. The power would come from the relay's power wire thus bypassing the other relay. Im not sure but thought it is worth a shot. Any ideas about that?

are you saying you want to use only one relay? but that single relay to break continuity on your trunk and pop it at the same time?

No. Keep the relay I already have installed ( the one that is used to convert the aux to pasotive to pop the trunk. Then install another relay between the first relay and the button that will disable the trunk button inside the car while the system is armed. Since the trunk would be getting its power from the first relay when you push aux 1, the other relay wouldnt effect it (i think). And since I have my alarm programed to disarm when i press aux 1, this should work. Well I hope so atleast?

waht i mentioned above is basically what you want to do. keep one relay to change polarity for trunk pop but at the same time break the wire when you arm it.

Is there anyway to keep the relay for the trunk relase intact just like I do in the picture and then just wire another relay either before or after the 1st relay that would get wired to the ground when armed output. I now understand that the armed output is a negative wire and the trunk wire itself is positive so I would need to convert it. I was just hoping I could keep that relay alone and just add another relay. posted_image

Would this work tedmond? Here the relay on the right is exactly how I have my relay for my trunk release. These one on the left is the relay you had mentioned before.

posted_image