I have searched and still can't find what the problem is, I even bypassed the speaker at the amp, from what is seems on the wiring diagram my grey and yellow wire turns into a brown and a black and red wire before it goes through the door then to a solid green and a solid red wire in the door. When using a multimeter I get a reading from the amp plug in to the HU and a reading from the speaker terminals themselves but an out of limit reading from the connector in the door that plugs to the speaker to the amp and an out of limit reading from the connector at the amp to the speaker. I have a 2003 g35 coupe with stock Bose amp and speakers, the door speaker stopped working months ago but I ad a little time to try and diagnose the issue today. Anyone else have this issue?