Both sides have switches in them. And yes there behing the c pillar too.
BTW, Depending what car, u got 3 pillars. A B C (although hatches have D too)
The pillars are what "joins the roof" to the rest of the car. So a-pillar is at the front. B, between the doors, C behing the read door. And thats it for a sedan, but a hacth has D right at the back.
Not all cars have door buttons on each door. I had to put in some buttons on my gfs car when i was installing her central locking...
You just tap into that wire and extended it to where ever u want it brother. pm for more info if needed
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