Navigation Computer: Notes

The navigation contains a microprocessor and CD drive for navigation system operation.

The computer collects data from various sensors to compute the vehicle location.

The location information is used to calculate the correct route to destination. This information is ultimately displayed on the BMBT screen.

There are several configurations of the navigation computer depending upon version.

The navigation computer on most models is located on the left side of the luggage compartment (except E52 which is behind the seats).

The Mark I and Mark II navigation computer can be identified by the "On" and "CD-IN" LED's on the front face plate.

Fig 1: Identifying Mark I And Mark II Navigation Computer

Courtesy of BMW OF NORTH AMERICA, INC.

The Mark III computer can be identified by the "Power" LED and the lack of the "CD-IN" LED.

The navigation computer contains several components important to navigation system operation. Depending upon the version, the components/systems include:

CD Drive for Map CD and Navigation software
Hardware for Navigation functions
GPS Receiver
Gyro Sensor (Mark II and III Only)
Output for audio interface
Output for visual display
Cooling fan
Magnetic Field Sensor Connector (Mark I only)