auto headlights and remote state, 05 tita

Ok, I thought I had this right. I have a Matrix 50.5X with remote start on an 05 Titan LE, which has auto headlights. I was following the same setup that I found in a search for this here: https://www.the12volt.com/installbay/forum_posts.asp?tid=10959&KW=headlights So I hooked up a relay like so: 86 ---- constant 12v 85 ---- (-) GREEN / WHITE factory re-arm wire (H2/4) 87 ---- ground 87a --- (-) green door trigger input of alarm 30 ---- (-) diode isolated driver door trigger of car (H1/8) I also have the green input of alarm diode isolated to the 3 other door triggers. The door triggers the alarm. But after a remote start and then shutdown using the remote, the headlights stay on. Any idea what I did wrong? Thanks, Brandon

Oh, crap. I think I figured out the problem. Help me out here with my thinking: So, before I added the relay for the re-arm wire, I originally had the (-) GREEN door trigger input of the alarm diode isolated to the door trigger of the car. I had the cathode side to the car and the anode side toward the alarm. This would prevent any (-) signals from the alarm going toward the door trigger of the car. So, when I added the relay, I kept the diode attached to the door trigger of the car and then the anode side of the diode attached to terminal 30 of the relay. I think this is where the problem is. Now, it of course works when the relay is at rest, but when energized by the re-arm wire, the (-) ground signal from terminal 87 is stopped by the diode from reaching the door trigger. So the car never thinks that the door has been opened and thus keeps the lights on. What I need to do is place the diode with the cathode side on terminal 87a and the anode on the GREEN door trigger input of the alarm. Is this right??

I would wire the relay like this:

86 ---- constant 12v

85 ---- (-) GREEN / WHITE factory re-arm wire (H2/4) 87 ---- ground 87a --- no connection30 ---- drivers door pin at BCM (no diodes or anything).

You don't need to tie this to your door trigger, as you are NOT trying to trigger the alarm, you are trying to trigger the OEM BCM.  This circuit should have nothing to do with the door pin security that requires diodes. 

Kevin Pierson

KPierson wrote: I would wire the relay like this: 86 ---- constant 12v 85 ---- (-) GREEN / WHITE factory re-arm wire (H2/4) 87 ---- ground 87a --- no connection 30 ---- drivers door pin at BCM (no diodes or anything). You don't need to tie this to your door trigger, as you are NOT trying to trigger the alarm, you are trying to trigger the OEM BCM. This circuit should have nothing to do with the door pin security that requires diodes.

Umm, what's the difference between drivers door PIN and drivers door TRIGGER? That's the same wire at the BCM, no?