I own a 2001 Lincoln Navigator. I went to a ford dealership about my XM Tuner. It's currently the GEX-FM903XM tuner which they said it may have been a factory equip version, because it looks like it was in the car since day one. I was wondering how I can work it becauseI cannot turn it on regaurdless of pressing the button.

Ps. This is my first truck, so I'm learning.

 

That was the first aftermarket XM tuner on the market back when XM radio went live way back when (15 years ago). I had two of them back in the day, both failed after only a few years.

If yours has failed and you want satellite radio, you might as well transition to one of the Sirius PnP models unless you want to take your chances on that big auction site.