dome light 4 dr trigger

When installing alarms on newer vehicle with a wire for each door and you need to isolate each one. Is it possible just to hook up to dome light direct ?

found this on another board to prevent false alarms when the BCM goes to sleep . Would it work ?

----ok here is the easiest way to overide the gem module is to wire a relay and use the dome light wire. I dont even use the door triggers anymore. this is how I do it( ford integratesthis into their own alarms now) use a relay and connect the ground when armed output of the alarm to pin 85. Give 12v to pins 86 and 30. Now this is the hardest part - You need to meter out some resistors to equal 10,000 ohms(10k) attach them to pin 87 and the other end to a wire that runs to the dome light wire. This will proved enough so the alarm doesnt fault every 30 minutes. I bet you have the Blue instant trigger wire attached to the gem module and it shutting down that circuit. If so I would just use a mercury switch and call it a day.

So is there any way around not having to get each individual door  and going to the dome light . Maybe some combination of relays ?

This is not a black and white question. The answer  is sometimes yes and sometimes no. If the alarms you use have a way of delaying the door trigger(like DEI and Avox) you can, but always. Some you can are Toyotas, Nissans, Hondas. Some Fords you can(like Explorer and Expedition) and some you can't(like Mustang). Most GM's will false when the BCM sleeps if you do. Most Chrysler stuff will work, but won't if you turn the interior lights off at the switch.

As you can see it all depends. Is there a specific car in mind?

Again, that's not always true. Try it on a GM truck and it will false every 20 minutes...

so which cars have a sleep mode?

ford

chevy

chrysler

honda

toyota

nissan

mazda