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Couple of alarm wiring questions

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Old Sep 12, 2008 | 07:11 PM
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Default Couple of alarm wiring questions

Hi all, I am installing an alarm in my tc, and cannot locate a few wires. I am looking for the door pin wires in the dash. I read where they are supposed to be on the thirty pin, but there are like three thirty pin connectors in that area.

Next, when I hit the alarm unarm/unlock button the drivers door unlocks, and when I hit it again the drivers door locks. What can I do to unlock all of the doors? Do I have to wire the alarm to both doors, and the trunk seperately? I thought I could just go to the power lock/ unlock wires that I am using?

Any pics of wire locations?
Old Sep 12, 2008 | 07:21 PM
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First.. get it installed by a professional experianced tech.....

OK.. the dome light is located behind the fuse plate on the dash.. open that up, it'll be a blue wire located in the top left plug..

The lock/unlock, you have to use the 2 wires coming from the outside keyhole, can't use the inside switch because once the vehicle's computer goes to sleep, the unlock side doesn't work... when using the keyhole wirings, it requires 2 pulses from the alarm to unlock all doors and 1 pulse to lock doors.. if they are locking when you hit the 2nd time, you have it hooked up wrong.

I don't know the exact wire colors for the locks.. if memory besides me, i think it is purple for unlock, and grey for lock...

Are you using a test light or multi-meter for testing wires before hooking up to them.
Old Sep 13, 2008 | 01:18 AM
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I am using a multimeter, but I am new to using that also. I think my door lock problem is that I don't have it set up for double pulse.

But now I just need to figure out where the door pin wire is in the dash area?

Thanks for the help.
Old Sep 22, 2008 | 05:13 AM
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Allright, so I have some answers now. The door lock problem was just a matter of setting up the alarm to double pulse, and I can unlock it after sleeping all night without problems.

Next, the door pins. I hooked up the first door pin wire to the alarm directly, and the passenger door pin wire directly, so I never used the harness area for that. It does the thrick and has been working for about two weeks no problem.
Old Sep 22, 2008 | 04:44 PM
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did you isolate each door pin with diodes?? you can run into problems down the road if you did not..

you can find the door pins and the trunk pin all behind that little pull down door on the drivers side... but... the wires are kinda mixed around between different plugs... you just have to test for them...
Old Sep 22, 2008 | 04:50 PM
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Originally Posted by tweetertc
did you isolate each door pin with diodes?? you can run into problems down the road if you did not..
TweeterTC is right..you must diode isolate each door trigger wire. I am sorry but if you're new to using a multi-meter..you should not be installing this alarm. I am not trying to sound mean but I'd just hate to see something in your car get messed up. Either way..good luck and let us know how it turns out. I am an MECP certified tech at Best Buy and have access to wiring diagrams galore so if you need anything else, hit me up.

-Adam-
Old Sep 22, 2008 | 06:59 PM
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Hell ya to the MECP best buy... im one too. But anyways you can also use your dome light wire that is behind the glove box that will do all door triggers and the trunk. But If you dont do that then you will need to diode isolate each door trigger wire. And use the seperate wire for the trunk. Now on the diodes there is an anode and cathode side. If you decide to do this anyways you will need a 1 amp diode for the door trigger wires and place the stripped side of the diode towards the door trigger wire. Good luck and just be careful, you can really mess up a car with this stuff.
Old Sep 22, 2008 | 10:05 PM
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Well, it has been installed for about two or three weeks now, with no problems. The only thing I did'nt do is diode the door pins. I am not real sure what a diode does to tell the truth.
Old Sep 22, 2008 | 10:12 PM
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Ok, so I checked online and it looks like the diode acts as a gate in one direction which will only let current flow one way. Right? And I am geussing that the door pins coul'nt handle reverse flow?
Old Sep 23, 2008 | 01:15 AM
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correct..a diode allows current to flow only one direction which prevents backfeed to whatever you are isolating.
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