bking

Where is the USB port in a 2007 S550?
I can't find one.

Arlen777

in a glove box, if you have that option installed in ur car

cool_lagoon

your model if so equip is with an apple port located inside the glove compartment , not all models have that option.

Diesel Benz

It could also be an ordinary 3.5 mm AUX audio in plus a video plug. Anyway no USB port.

cool_lagoon

AUX (RCA jack) are located on the right hand side top portion of the glove compartment. check with your owners operating manual for details of your equipment options.

bking

In searching the glove box with my finger for a connector, something was picked up through the felt lining at the top of the box (ceiling). By inserting a mirror I glimpsed something indistinguishable that accepted a USB cable but which provided no power. It is unclear if it is indeed a USB port or if it is something else. A diagram of the glove box could clear it up if I could find one.
Thank you for the info about the PMCIA adapter because, thinking that it was already present, I inserted my storage media only to see it fall through the bottom of the apparatus. So, I am off to my local vendor to try and find one.