3 Pulse programmable relay

Hi I'm trying to figure out how to build or where to buy a pulse relay that will send out one momentary 12v pulse only after receiving 3 pulses in a row, the idea is to make it so I can hit unlock on my car 3 times sending out power to the electric fuel door opener so it opens up without me having to go inside the car. Any help would be greatly appreciated

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Jarod

Here is one possibility using a flexible and readily available module :

You could use a PAC TR-7 module for this. These modules cost under $20 and can be programmed to do various
functions. Here is a link to the TR-7 Guide : https://www.the12volt.com/installbay/file.asp?ID=1031

See Feature #14. You could use the (+) drivers door lock motor wire as an input on the TR-7's Green wire.
Then program the TR-7 for Feature #14 with 3 input pulses within 5 seconds to get a (+) output pulse on the
Blue wire rated at 4 amps to control the fuel door relay ( or a (-) 150mA pulse on the White wire ).

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Soldering is fun!

Thank you so much!!!

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Jarod

Metra TRIGGER has a poop ton of programmable features.

https://www.metraonline.com/part/TRIGGER