Hi @stewartbruce66
Welcome to the Pandora Community!
For a 2015 Mercedes-Benz S550, the simplest way to listen to Pandora is by connecting your phone to your vehicle using Bluetooth. Once your phone is paired with the car, select Bluetooth Audio (or a similar media source) in your Mercedes infotainment system, then open the Pandora app on your phone and start playing your music.
If your S550 is equipped with the Mercedes Media Interface, you may also be able to connect your phone with a USB cable, depending on your phone and your vehicle's equipment.
If your vehicle has an aftermarket stereo, it may also support additional features like Apple CarPlay or Android Auto, depending on the model.
Hope this helps!
Use your mobile device only when conditions allow and as permitted by applicable law.
... View more