Navigation Computer

Navigation Computer
The navigation computer is installed in the DIN radio slot in the fascia. A spring loaded catch on each side of the navigation computer secures it in position. Slide tools, installed in slots at the bottom front corners of the navigation computer, are required to unlock the catches during removal.

The navigation computer contains all the hardware and software required for control of the navigation, radio and CD systems, including the GPS receiver and a solid state piezo gyro for the navigation system. The piezo gyro measures the motion of the vehicle around its vertical axis.

The controls for the navigation computer are all located on the front panel of the unit. The center section of the front panel hinges to allow access to the CD player and, for security purposes, can be removed from the unit. The controls perform the following functions:
^ On/Off (ON) button, for switching the unit on and off.
^ Tone button, for activating the tone menu to adjust bass, treble, balance, fade and loudness functions.
^ Traffic Programme (TP) button, for activating the traffic information programme menu (Europe only).
^ Compact Disc (CD) mode button, for selecting CD operation.
^ Radio (Rad) mode button, for selecting radio operation and tuning menus.
^ Navigation (Nav) mode button, for entry and exit of the navigation menu and service mode.
^ CD eject button, opens the removable panel and ejects the CD.
^ RH rotary control, scrolls through menus when turned and enters a selection when pressed. Also mutes audio navigation instructions when pressed in navigation mode.
^ Multifunction buttons, for entering the security code and menu selections.
^ Liquid Crystal Display (LCD), green screen that displays navigation, radio and CD information.
^ LH rotary control, adjusts volume when turned. When pressed, restores, repeats or interrupts audio navigation instructions or provides destination details.










Inputs and Outputs
In addition to the vehicle sensor and the antenna inputs, the navigation computer also receives the following:
^ A permanent battery feed from the passenger compartment fusebox, to power the navigation function.
^ An ignition switched battery feed from the passenger compartment fusebox, to power the navigation, radio and CD functions when the ignition switch is in positions I and II.
^ An illumination power feed for switch illumination and LCD backlighting when the exterior lights are on.

Navigation computer outputs consist of those for the ICE system speakers and to the auxiliary CD autochanger, where fitted.

Security Code
The navigation computer is programmed with a five digit security code selected from numbers 1 to 7. If the battery or the navigation computer are disconnected, the code is requested on the LCD the first time the navigation computer is switched on after reconnection; this also occurs if a different removable panel is fitted.

The code is entered using the appropriate multifunction buttons. The navigation computer automatically starts to operate when the fifth digit of the correct code is entered. If an incorrect code is entered, CODE is displayed on the LCD to prompt another entry attempt. If an incorrect code is entered three times in succession, WAIT is displayed on the LCD and the unit is disabled for approximately 60 minutes. If the navigation computer is switched off, the remaining disabled time will resume when the power is restored.