Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.