@shpuncik I did consider that but my concern was that all of the buttons might share a common return. If that's true and you tap off of it, it could lead to erroneous signals being sent to the car's computer when one of the new switches is activated. I didn't want press a new button and inadvertently turn on the rear defrost for example. So easier (safer?) just to bypass the existing harness.switches operate through resistance so depending on what you gonna control you could reuse pins on original connector without adding any wires.