Mark II Navigation System Introduction/Component Locations
MARK II NAVIGATION SYSTEM
The Mark II Navigation system became available as factory installed optimal equipment for all E38/E39 vehicles starting with 9/97 production. Manufactured by Phillips, the Mark II system is the second generation Navigation system based on the Mark I system introduced in October 1996.
To the operator, the Mark II system changes are almost transparent. The overall system function and most of the systems components carry over from the Mark I system.
The Mark II system provides:
- Reduction in the total number of components,
- Simplified control module interface,
- Automatic calibration procedure.
COMPONENT LOCATIONS AND CHANGES
Trunk area: At first glance, the reduction of Board Monitor/Navigation system components in the left side trunk area, is immediately recognized.
- Though the Navigation Computer looks the same as the Mk-1 from its installed position, it is actually a different component. It provides expanded capabilities and simplified system interface compared with the same component of the Mark I system.
- The GPS receiver module is also a different component. It has an EL0 connector for 26 pin breakout box compatibility.
- The radio and audio system amplifier are the same components of the previous system.
- The Video Module of the Mark I system is not utilized with the Mark II system in the US market.
All of the Navigation system/Board monitor functions previously handled by the video module are controlled by the Mk-2 navigation computer.
Parcel Shelf Mounted Components:
The GPS Receiver Module Antenna is the only component of the Mark II system mounted on the parcel shelf.
The antenna component has a slightly different appearance but provides the same function of the Mark I system antenna.
The parcel shelf mounted Magnetic Field Sensor of the Mark I system is not used for the Mark II system.
Board Monitor:
The physical characteristics of the Board Monitor are unchanged from the Mark I system. It provides the visual display information and control for:
- Audio system (radio, tape, cd and DSP systems)
- Board Computer V
- Mark II Navigation system
- Telephone (if equipped)
- Emergency function (Mayday programming)
- Owner customized Board Monitor settings
Since the limited television audio capabilities of the Mark I system are not available with the Mark II system, the Television function has been removed from the Board Monitor main menu.
MARK II NAVIGATION COMPUTER
Though the front bezel is identical to Nav computer of Mark I system, the Mark II Navigation computer is an different new component.
Standardized EL0 connectors replace the "blade type" connectors of the Mark I system. This ensures circuit integrity and allows simplified 26 pin breakout box connection for diagnostic purposes.
The expanded capabilities of the Mark II Nav computer has made it possible to delete the following required connectors of the Mark I system:
- the magnetic field sensor input connector,
- the ARCNET triaxial connector,
- the 3 amp fuse has also been deleted.
INTEGRAL ELECTRONIC PIEZO GYRO SENSOR
The nav computer contains an electronic gyro sensor that detects changes in the vehicle's driven direction (changes in vehicle yaw). Similar to the Rotation Rate Sensor of the DSC III system, the gyro sensor measures the motion of the vehicle on it's vertical axis.
This is an internal component of the Nav Computer. It is not serviceable nor does it require calibration.
Do not open the Nav computer this will void it's warranty. Photo is only intended to provide functional understanding
The gyro sensor provides status of vehicle turning maneuvers in the form of a changing voltage signal that the Nav computer uses as an input signal.
The Nav computer requires the gyro sensor's input signal along with the digitized map CD, the vehicle speed signal, and the GPS signals together to calculate, continually update and display the exact vehicle position on the LCD.
Gyro Sensor Operation:
- The internal control electronics of the sensor maintain a constant set frequency which is applied to the oscillation elements causing a calculated vibration to occur. The frequency is also simultaneously monitored by the phase detector.
- The vibration passes up to the pick-up elements of the tuning fork causing them to vibrate and be suspended in a free floating state, easily influenced by rotational movement.
- When the vehicle turns, the free-floating upper ends of the tuning fork flex. This generates a millivoltage signal proportional to the turn.
- The signal amplifier receives the signal and passes it on to the phase detector which compares it to the original set frequency.
- The phase detector determines what direction the vehicle has turned and passes the result on to the frequency filter.
- Since the piezo gyro sensor is also picking up other vibrational movements in the vehicle, the frequency filter isolates the pertinent yaw signals and provides a DC voltage signal proportional to the left/right turning movement of the vehicle.