texasham10

I appreciate the diagram; I installed a U220 with an existing 3200BT. What I don't understand is the connector(?) with the numbers on it. You show the PAC unit and the AVH harness wire colors, but I don't understand the block in the upper left with the black, green, and red wires. Is this a relay? If so would that already be in the installation, or would I need to purchase one. If I need to purchase, is there a model or part number you recommend?