Pin 1 (red) is positive, pin 2 (brown) is ground, and pin 3 (blue) is the signal wire connected to the BCM. I'm not sure what terminal you need to connect at the Passats BCM. You'd need to get a wiring diagram.Hi! Great job. I have passat variant 2013 highline. Also keyless entrance and electrical trunk. I have bought 3AA.962.243D 3AA.973.705 and 4H0.973.704C. But couldn’t install. I coded from vcds. It is ok. But mine wires colors are red, brown and blue. You can see at the picture. Could you help me?