Most modern alarms come with an aux output to use when the alarm is off,
the most common use for this output is to remotely open your boot.
In this guide I will show you how to wire up this feature from ana alarm that has a negative output.
Tools/equipment Needed:
Soldering iron
Screwdrivers
Knife/wire strippers
Crimps
Relay
Wire
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Boot pop
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Boot Pop
Ejecter seat anyone?
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Step one
Identify what you are wanting to do, below is a diagram of what we are doing here,
remember our alarm has a negative pulse.
Positive ones will have a different way of wiring it up.
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Step two
Identify the boot pop switch, in our case it's a mk3.5 one to the side of the gear stick,
to pop it out, simply remove the two coin trays and put your hand under the switch and push up.
The early mk3's have the switch on the top coin tray but the principle is the same.
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step three
Identify the wire from the alarm and run it to the centre console ready to be hard wired in.
Refer to your instruction manual for the identification of this wire.
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Step four
Remove the switch from the plug, this will let you move the wires round abit and
reduce damage to the switch by heat from the soldering.
Identify which wire is the positive supply to the switch and which is the signal
to the popper. Use an multi-metre to do this.
In the case here the supply power wire is the red/yellow and the signal is the white/red with the black outer.
On other fiestas the colour of the wire varies, so please use the multi-metre
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step five
The relay.
Below is the relay you will use; it is a 40A SPNO (Single Pole Normally Open).
Notice the diagram on the top, this will help you with the diagram above.
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step six
wire up the relay.
Take two lengths of wire, two crimps with covers and terminate one end of each
wire with a terminal and insulate it with a cover.
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Then plug the two wires onto the relay on pins 85 and 30
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Next solder the two ends of the wires together so the positive is supplied to both pins.
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Take a length of different coloured wire and terminate the end with a crimp and connect to pin 87 on the relay.
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step 8
now you can start to hard wire into your switch wiring.
Identify the positive supply to the switch as mentioned above, ours was red/yellow.
Bare part of the inner wire then wrap the exposed end from step six around it
and solder it for a nice secure connection then insulate it before starting the next step.
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step 9
take the wire from step 7 and solder it to the signal wire on the switch (white/red)
insulate again to stop short circuits
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step 10
Lastly terminate the wire from the alarm and connect it to pin 86 on the relay,
then wrap up all the wires neat with tape. Place the relay in the centre console,
refit the switch and trims
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then if that's all done, get out of the car, press the boot pop button and hay presto the boot will open.
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To be different you could try changing the gas struts to make the boot pop right open!
This works by increased force in the struts. The mk3 only had one strut hence a stronger
one to enable you to open the boot. The mk3.5 has two weaker ones to do the same job.
So if you put two mk3 struts on a mk3.5 , you have a fully opening system.
The simply clip off and push back on and will cost you about a fiver in a scrappers.
Below is a video of them in action.
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Hope this guide is of some help. Cheers Steve.
Guide Written and © On 24 Sept 2007 by Andrew Whiteman (AW3K)
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