Originally Posted by Diesel Benz

Gyros are at the Navi processor unit, and I guess you cannot install the head unit in a wrong angle. Although there are some head unit types that integrate navigation and can be used on different models, then you have to adjust the gyro angle accordingly. This should not be an issue for a W211.

Originally Posted by tashakes

Diesel-Benz is right there is tons of info, just to be more specific (nothing better to do :-) :

I have tele-aid and a harmon kardon system.
-YES!

There is already and antennae on the car, can I assume that was from the tele-aid and will work with the Navi?
-YES

Do I need a audio gateway even witht the harmon kardon system?
-NO, it is already there.

I do need the bracket and trunk liner I know that for sure.
-NOT NECESSARILY, I mounted mine under the parcel shelf. See pic.

Do I need to run a fiber cable to hook up to the MOST in the B
pillar?
-NO, it is already there, what you have to do is connect the cables in the right sequence. You will need access to the bottom of the B pillar and under the rear seat.

You also need to take a look at the posts to figure out if your car is prewired for navi, not all 2003 cars were.

Cheers.

Originally Posted by m3tonyh@verizon

Hi,
I know this post is kinda old now, but how can I tell if my car is pre-wired for nav or not. I have a '03 E55 production date of 04/03. What and where should I look? Thanks alot! Tony