Trunk Release diagram for european Yaris 2009

Hello everyone,
I recently installed a custom trunk release system in my Yaris Sol hatchback. Here you can see the scheme of the installation (I think I connected the relay upside down, but it works anyway)

I would like to know how can I use 2 consecutive negative pulses from the remote control key to activate the relay of the trunk release?
1 pulse from the remote control unlocks all doors (this is factory default).
I think the solution might be in this diagram but since I'm a newbie I don't know how to use it in my situation.
I appriciate your suggestions, thanks.
Marco

If this is all you want, a simple keyless entry system with an auxiliary output or trunk pop would do this for you. Then you'd just carry that remote instead of your factory remote.

For a little more, you could get an alarm or remote start.

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My ex once told me I have a perfect face for radio.

You could use a PAC TR-7 module to do this.  Using Feature 14 wiring and programming, you could have the Green (+)
Input wire connected to the Drivers Door Unlock Motor wire.  Program the TR-7 to 2 input pulses within 3 seconds to give
an output.  Connect the Blue (+) output wire to the wire at Relay Pin 85.  *
Here is a link to the PAC TR-7 manual  :  https://www.the12volt.com/installbay/file.asp?ID=1031

Here in the States a PAC TR-7 module goes for $15.  As Mr. Geepherder said, it might be just as easy to get a
aftermarket Remote Start with Keyless Entry system for $50 and have it all on one remote.

* Standard relay convention is Relay Pin 85 gets a (-) input and Relay Pin 86 gets the (+) input.  Your diagram will work
  as long as the relay is not polarity sensitive ( internal coil quenching diode ).

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Soldering is fun!

Kreg, very few Euro alarms have aux outputs which is why I've been using Clifford from the 80's!!
Our OP might be able to use a Chinese fleabay for that money but I'll say no more.
All the Yaris models, alarms are so easy.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Thanks everyone for the very quick answers!

Although using an aftermarket remote is the easiest way I would like to find a solution to keep using the toyota remote, and the PAC TR-7 module do exactly what I want, thanks Kreg.
I took also a quick look at Clifford's website, if I'll have to install an aftermarket remote I consider these products.

I search a lot the web about my issue, do you think that this diagram can help in my case?

Hi Kreg, I finally received the TR-7 from the States and installed on my Yaris according to your instructions.
It works perfectly! Thank you very much.
Here you can see it in action: YARIS HATCH POPPING