i have a 04 thx audio system, i just replaced my factory subwoofer amp with a aftermarket one but its not powering on, now i wired up the amp and i got 12v going to the amp and when the car is on i get 14v so the power is fine now the remote on wire (yellow/green) from the factory HU i dont get anything at all, the reason that i changed my factory amp is because i thought it was blown i guess this was the issue, any thoughts of how can i fix this, by the way the other interior speakers amp does power on and working.

by the way i checked all the fuses, the ones in the passanger side and the trunk next to the battery and also the fuse on the amp itself and all are good.