Navigation system – circuit operation rev: 09/2001

NAVIGATION SYSTEM – CIRCUIT OPERATION REV: 09/2001

CIRCUIT OPERATION

The following components make up the navigation system:  Navigation Computer (Z289)  GPS Antenna (Z292)  Display and Control Unit (Z291)

Navigation Computer (Z289):

The Navigation Computer (Z289) is located in the right hand side of the luggage compartment, attached to a bracket. The Navigation Computer (Z289) is the main component in the navigation system and receives input from the BECM (Z238) and the GPS Antenna (Z292). The Navigation Computer (Z289) contains a solid state piezo gyro which measures the motion in the vehicle around its vertical axis. The gyro operates on the principle known as the Coriolis force (Refer to the workshop manual for detailed operation). Using the inputs from the BECM (Z238), the GPS Antenna (Z292) and the gyro sensor, the Navigation Computer (Z289) can determine the vehicle‘s current position, direction and speed. The Navigation Computer (Z289) also houses the CD-ROM drive. This drive is used to read map data from country specific CD’s and also to load updated software into the computer.