I want to be able to close the electric tailgate on my car using my keyfob (this functionality is not possible from the factory).
Coming from a software developer background, of course I could use some micro processor to solve this, but I want to solve this problem without using one.
Below is a part of the schematic of the electric tailgate with 3 wires added by me, but what I'm struggling with is what should be in between.
How it works at the moment:
- Tailgate button is pressed on keyfob;
- 12-14V (car battery/alternator voltage) comes through the
1wire, unlatching the lock mechanism using V254 (holds unlatched for about 0.5s) and the tailgate module opens the tailgate using the motors attached to the hinges;
- By pressing the momentary button E406, the wire
3essentially gets connected to GND via wire
2and the tailgate module now knows it needs to close the tailgate
What I want to do is simulate a button press of E406 if I actuate the lock latching action twice withing a given time frame (1-2s)
I'm assuming I will need some transistor as a switch to connect wires
3 that is controlled by some logic (capacitor charging up to a needed voltage from
1 wire?). I don't have much (or at all) experience with making-up logic circuicts.