I have a 07 Honda Ridgeline EX-L (aka RT-L in the US) no navi. I just got a made in China touchscreen head unit. The unit has steering wheel control but there is only one wire (labelled key1) on the harness that came with it. Everything that I’ve read online typically refers to key1, key2 and a swc ground wires coming out of the unit which is not the case with mine. On the Ridgeline’s factory harness, there are supposed to be two wires, the control wire positive and the control wire ground. I’m sure the control wire positive is connected to the key1 wire but where do I connect the control ground wire to? Does the head unit’s ground wire make sense? Head unit’s manual is for a lack of better term “sh*t” so cant find any directions. And yes google has been used but nothing specific in this situation is coming up.