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1995 chevy van door locks

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Member - Posts: 9
Member spacespace
Joined: August 24, 2007
Location: United States
Posted: August 28, 2007 at 2:10 PM / IP Logged  


My dilemma is: I have a 1995 Chevy Gladiator G-20 conversion van I have installed an alarm system and have everything figured out, installed, and working accept the door pin switch that sets the alarm off and the door lock-unlock wire combo.

The door pin switch is a negative switch I believe which the drivers door pin switch has 2 wires connected to it and all the other ones (passenger, side, and rear) only have one wire connected to them.

The factory door switches have a 3 wire connection. 1st constant hot(orange and black), 2nd one negative (solid black), and 3rd negative (blue) wire.

Looking at the manual from the alarm is where I am getting confused. It’s showing at the top of the box unit a small jack that has three wires saying blue-unlock, red-12v + out, and green-lock. Then looking at the side of the alarm control box there are green….(-) door trigger, blue….(-) trigger, and violet….(+) positive door trigger wires. I do not understand which goes with which. Have tried several combos and nothing works. From reading it seems I might need a relay. I also have read through the “Hanes” book on the van, but it is not any help.

Any suggestions would be greatly appreciated…..


Tom H.

(liverlips) Tucson, AZ

Copper - Posts: 96
Copper spacespace
Joined: June 10, 2003
Posted: August 28, 2007 at 4:45 PM / IP Logged  
as old as that van is, it most likely has reverse polarity locks. you will need a diagram to wire those up.  and you only use one door pin wire from the brain. Likely it will be the green (-) input wire.  Just check with a probe on the door pin to see which wire changes polarity from floating to negative when the door is opened.
Gold - Posts: 1,043
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Joined: December 19, 2006
Location: Missouri, United States
Posted: August 28, 2007 at 6:52 PM / IP Logged  
Power Lock
Power Unlock
Door Trigger
Of course this info needs to be tested with a dmm!
CHEVROLET, VAN, 1995, Door Trigger
Also found behind instrument cluster.

Your door locks on the van should be (+) which means you will need two relays to convert the (-) door locks pulses of the alarm to a positive.

Your door trigger will be (-) so the  green(-) door trigger of the alarm should be hooked up to this. Violet would only be used if you had a (+) door trigger so you don't need to worry about that one.

The blue(-) trigger on the alarm would be used for something like a hood pin.

Member - Posts: 9
Member spacespace
Joined: August 24, 2007
Location: United States
Posted: August 30, 2007 at 5:32 AM / IP Logged  

Hey Guy,

Thanks for taking the time to answer. On the door locks, I have found that the orange wire being (constant) positive , if I take a jumper wire from the orange to the blue- it locks; then when I take the jumper wire from the orange to the black it - unlocks. Does this stil mean it is a negative door lock system?

Platinum - Posts: 2,208
Platinum spacespace
Joined: December 11, 2002
Location: New Hampshire, United States
Posted: August 30, 2007 at 9:58 AM / IP Logged  
As stated above by mikvot your van has 3-wire positive doorlocks and you will need to add relays: Relay Setup
Instead of relays, you could use: Polarity Inverter    Relays will be easier to can get them at Radio Shack. You could stop by an alarm shop and ask them if they have a door lock polarity inverter. It converts a (-) pulse to a (+) pulse.

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