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.
Mark II Navigation Computer
The Mark II computer introduced on the E38 and E39 as of 9/97 production. There are considerable changes to the system. The connectors for the ARCNET and magnetic field sensor have been deleted as well as the 3 amp external fuse. The external blade type connections have been replaced by two 26-pin ELO type connectors.
Internally, a Gyro Sensor has been added to measure the motion of the vehicle on its vertical axis. The gyro sensor is integral to the navigation computer and cannot be serviced separately.
The internal gyro sensor eliminates the need for the magnetic field sensor from Mark I.
The front faceplate of the Mark II computer appears identical to the Mark I system, however they are not interchangeable.
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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.