yea sorry for the confusion, it is the whole nav computer that i ordered.. should be here on wendsday according to Fed Ex, that with a new battery is going to put ease in my mind atleast.. ill let you guys know what the out come is once i install the nav computer.

just recived the unit, and my screen is still unresponsive, the red LED on the unit is flashing. what does this mean?

You got a DVD-based MKIV, correct? Where did you get the MKIV, and what are the details of the car that it came from?

There were two versions of the navigation system-- the U.S. (and I think all of North America) only got the professional system that has the full color, in-dash display. Europe got the option for a Business navigation system that had a simple text-only display on the face of a standard radio.

The MKIV is configurable to work with either system. If you got a MKIV that is coded for a radio nav, it will just give you the blank screen in your car.

If the dealer replaced the nav computer and the car came to life, then that is a pretty good indication that the original nav computer was bad and everything else is OK. So, you have two likely causes:

1) You received a bad nav computer
2) The nav computer is coded for the monochrome, radio nav configuration

Many years back I bought a used MKIV from Germany. It turned out to be coded for monochrome. Brian used Navcoder to recode it to color nav. Been fine since then.

The unit is off of a 2006 4.8is from the states (i live in Canada). the seller agreed to send me a new unit and try that one. But what does the flashing red LED means?

The LED is just a disk activity light. It indicates that the unit is actively seeking or reading the map disk.

Does the unit have a sticker with the original car's VIN? If it does, you can enter the last 7 characters of the VIN on this site, and it will tell you the model and region of the donor car.

RealOEM.com * Online BMW Parts Catalog