L322 Range Rover System Description and Operation
INSTRUMENTS
88-18
DESCRIPTION AND OPERATION
When the on-board computer is being accessed via the MID/MFD, these units communicate with the instrument pack
message centre to display the function information in the display in the MID/MFD only. The MID/MFD also allow for
the resetting and programming of certain on-board computer functions, such as the clock, date, speed limit and stop
watch.
The on-board computer system of the instrument pack supplies the MID/MFD with data and commands on the I Bus.
Some computer functions require an exchange of data between the Automatic Temperature Control (ATC) ECU and
the Body Control Unit (BCU) which is carried out on the K Bus.
Operation of the buttons on the MID or selections on the LCD screen of the MFD are passed to the instrument pack
software for calculation of the text and numerical values to be displayed. The MID/MFD are purely a user interface
with regard to the on-board computer, with the instrument pack being the controlling component.
The MFD has one exception to this. Using data supplied by the instrument pack, the MFD self generates the text
messages which appear on the LCD screen.
Security Code
The security code function prevents unauthorised persons from starting the engine. This function is controlled from
the MID/MFD. The driver can select and enter a code, without which subsequent starting of the engine is prevented.
This function can be used if the vehicle is to left unattended for a long period of time, i.e. airport car park. Each time
the code is activated, it is only valid until the next time the engine is started. If the code is not available or forgotten,
emergency deactivation is possible.
The CODE is a four digit number which can be entered with the ignition at position I (AUX). If the vehicle is parked
with the code armed, starting of the engine is inhibited until the correct code is entered to disarm the alarm. If the
incorrect code is entered, the alarm horn is activated and the immobilisation ECU prevents starting. This is performed
by messages sent on the K bus to the BCU. The BCU electrically controls the alarm horn and the immobilisation ECU
functions.
The code can be selected on the MID and activated as follows:
Code Activation
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Make sure the ignition is in position I. Press the i key on the MID panel.
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Press the left side of the CODE SET key.
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CODE - - - - is displayed in the main display. Enter the code using the number keys. If the code is incorrectly
input, press the left side of the CLR SET button and re-enter the code.
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Press the right side of the CODE SET button to memorise the input and turn the ignition off.
Code De-activation
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When the ignition is moved to position II, the MID display prompts for the code.
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Using the numbered key buttons, enter the correct code. Once entered, press the right side of the CODE SET
button. If correctly entered the time display will appear and the engine will start.
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If the code is incorrectly entered three times or three attempts to start the engine are performed, the BBUS will
sound for 30 seconds.
The code can be selected on the MFD and activated as follows:
Code Activation
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Select CODE from the main menu.
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Enter the code using the rotary control. Turn the rotary control until the required number appears and press to
confirm. Enter the remaining numbers in the same way. If the code is incorrectly input, select CHANGE and
repeat the input procedure.
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Once the code is entered, it is activated by turning the ignition off.
Code De-activation
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When the ignition is moved to position II, the MFD display prompts for the code.
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Enter the code using the rotary control. Once the code is entered, select DEACTIVATE. If the code is incorrectly
input, select CHANGE and repeat the code input.