My peripheral pxamg stopped working after 2+ years. Is there anyway to confirm that is it my pxamg module that is faulty or whether it is the car. My TL is 2006 with navi, anyone with their pxamg that failed on them please chime in.

 

have you tried re-setting it?

 

Return the wiring to stock and remove the iSimple's harness. If you can hear the XM demo channel then you know it's not the car.

Before trying that I'd reseat the cables and make sure everything's tight. You can also reset it as mentioned above but the procedure involves opening it up and discharging a capacitor. (Alternatively you can just remove the iSimple and let it sit to drain said capacitor. This may take up to a few days though..)