external trunk release button

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danlong

Member - Posts: 15

Joined: November 22, 2002

Location: United States

Posted: August 02, 2007 at 1:24 AM / IP Logged

I want to add a button to activate the trunk solenoid right above my license plate where it can't be seen, but I need a way to disable it when I lock the doors to keep the trunk secure. I have a button in the car, I just want the convenience like many high end cars have. Any modules available to do this, or could it possibly be done with relays or such? Car is a 2005 Mazda 6 sedan.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: August 02, 2007 at 1:15 PM / IP Logged

Assuming factory switch is low current operating a remotely located relay as in Toota, European Ford or US Focus, use a latching relay controlled by the door locks, either trigger or motor going to break feed from switch. this will not draw any juice.

peterubers

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Joined: December 29, 2006

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Posted: August 05, 2007 at 1:39 PM / IP Logged

yeah, agreed -- you'll need to tap into the mazda's lock/unlock wires and setup the latching relay (closes circuit when unlocked to allow external button to open trunk, and then opens circuit to prevent this from occuring when car is locked)

Power Unlock		BLUE OR GREEN		(-)		FACTORY KEYLESS MODULE
	PowerLock		SAME WIRE		(-)		FACTORY KEYLESS MODULE

USE A 1000 OHM RESISTOR TO LOCK AND STRAIGHT GROUND TO UNLOCK. MUST USE RELAYS TO ISOLATE AND BOOST SIGNAL.

Usually there are only two wires behind the cabin trunk pop button -- one is ground, the other goes to the trunk popper at the trunk --

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danlong

Member - Posts: 15

Joined: November 22, 2002

Location: United States

Posted: August 05, 2007 at 9:53 PM / IP Logged

How does that resistor affect the signal? I need to differentiate between the lock and unlock pulse to latch or "unlatch" the relay. With a two wire setup this would be easy, but I'm not sure about the single wire setup.

peterubers

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Joined: December 29, 2006

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Posted: August 05, 2007 at 10:23 PM / IP Logged

in that case you may have to use the motor + wire to latch/unlatch (motor = actuator)

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danlong

Member - Posts: 15

Joined: November 22, 2002

Location: United States

Posted: August 05, 2007 at 10:28 PM / IP Logged

That's what I was thinking, do you know of a good source for the latching relays? I understand them, but have never used one before or even looked to purchase one. Thanks!

peterubers

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Joined: December 29, 2006

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Posted: August 05, 2007 at 10:47 PM / IP Logged

https://www.the12volt.com/relays/page5.asp#lsp

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danlong

Member - Posts: 15

Joined: November 22, 2002

Location: United States

Posted: August 06, 2007 at 10:37 AM / IP Logged

That will work, but they make some with 2 inputs, one to latch and one to unlatch. The problem with the one you can build is that if the lock button gets hit twice, it will flip back to the unlocked state.

peterubers

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Joined: December 29, 2006

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Posted: August 06, 2007 at 4:22 PM / IP Logged

Alternate is then just to do it off the dome light -- when the dome is on, trunk will be able to be popped by ext. button.

Use the dome light output wire from the BECU (body elec. control unit) so that even if you accidentally leave the dome light on by the switch, the trunk won't be poppable by ext. switch.

The search function is your friend.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: August 07, 2007 at 1:07 PM / IP Logged

One ground to latching relay is from lock wire, ground from unlock wire triggers an open circuit! Or vice versa. Latching reays normally come with 2x 12v+ feeds, 2 x ground feeds and either 2 x open or 1x open and 1 xclosed ore a changeover circuit. You can either constantly live and neg switch or if you are using motor wires, constantly neg and 12v+ switch! bSee what the relay does!

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