Remote Fuel-cutoff and Power Locks

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iceman.chris
Posts: 62
Joined: Sun Dec 28, 2008 3:01 pm
Car: '90 S13 Hatch - SR20 (sold)
'95 240sx LE (dd)

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So I just got my next addition to the 240 in the mail today, a rolling code UHF transmitter and receiver. The receiver has 4 relays which can be set to latching or momentary, and the chip has a reset pin as well, which I might have a use for (explained later). The transmitter is just a key fob like any other remote entry.

What I want to do is hide the receiver somewhere and run it as a sort of anti-theft device. I was thinking something along the lines of having the normally open contacts of a relay in series with the wire from the ecu to fuel pump relay. This way, the car won't start until I latch the relay (ie. press the corresponding button on the remote). Also, I want to hook it up so that when the ignition voltage disappears (ie. the key is turned to the off position) the relay resets, and opens the connection. This part I can do, but I'm open to suggestions on how to implement this. Mainly a good place to hide the receiver, it has to be dry (obviously) but also get good reception for max range. Preferably closer to the ecu.

Is there another way to have good theft prevention without the possibility of having my fuel cut off mid boosting? Like if my hand hit the key fob by accident? I could make it so the starter is the component that is controlled by the relay, but then a thief could technically just roll start my car and be off...

The second part is I want to use a couple relays for the power lock functions. Anyone know where the best place to tap into the sense wires for the lock/unlock signals?

Thirdly, I want a relay to control the horn. Just so I can scare people from a distance .

Any suggestions would be greatly appreciated. I can post pics too if people want some.

-Chris

EDIT: Here's the board I picked up, too lazy to build one myself http://www.electronickits.com/...4.htm


Burnout240
Posts: 6
Joined: Tue Apr 01, 2008 1:51 pm

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Did anything happen with this project? Sounded like a sweet idea.


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