Can't reactivate Sirius service for '05 Nissan Frontier

https://www.modifiedlife.com/2006-nissan-sentra-car-stereo-wiring-guide/

the link above might help. Good Luck.

2013 Nissan Frontier Car Stereo Wiring Guide
Car Radio Battery Constant 12V+ Wire: Yellow
Car Radio Accessory Switched 12V+ Wire: Green/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red
Car Radio Dimmer Wire: Gray
Left Front Speaker Positive Wire (+): Brown
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Red
Left Rear Speaker Positive Wire (+): Green
Left Rear Speaker Negative Wire (-): Black
Right Rear Speaker Positive Wire (+): Gray
Right Rear Speaker Negative Wire (-): Orange

Take it to a local stereo installer

No. You replace the stock amp and substitute the new one in its place.

What model of head unit do you have?

typical of a dealer old proverb if you pay peanuts you only employ monkeys ,this cas has the radio coded through the ECU so i would suggest a fuse is out in the fuse board if of remove the radio and check the fuse in the back of the radio

Sometimes CD players come with a plug that keeps the reader arm in place during shipping. If you don't remove this plug it doesn't allow the arm to move, thus a code. You might recheck this. If that's not the case, check your warranty papers, you might need to use them.

Are your rear speakers smplified or ran directly off of the radio?

if it plays through a radio station, then try changing the station to one that has no play or noise.

I have the same problem with the 2006 sentra