Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Touch Screen(ts) and Navigation Diagnostics

Fault codes and diagnostics can be retrieved/achieved using the manufacturer approved diagnostic system

Hard Key Test

The hard key test is used to check the operation of the hard switches.

If switch operation is normal, the switch colour on the screen will change when a hard switch is pressed. (Power switch operation cannot be checked on this screen.)

Touch Switch Test

The touch switch test calibrates the touch switch coordinates and checks touch switch operation.

Start Calibration - Calibrates the switch coordinates. Calibrate the coordinates by touching each of the "+" marks in the four corners of the screen.


Do not touch any locations other than the "+" marks. (Touching other locations may invalidate the calibration.)

Touch Switch Check - Checks for deviation in the coordinates. Check the coordinates of the touched location by verifying the displayed values. Touch and hold "press here" to return to the previous screen. If there is a large deviation in the coordinates, calibrate the touch switch using the "Start Calibration" function.

DTC Information

Search for the meaning of the displayed DTC.

Vehicle Configurations

Display the status of each vehicle system.

Speed Lock Configuration - Display the status of compulsory navigation settings (setting status of switches that cannot be operated) when driving.


Display primary system information.

Vehicle Signals

Display the status of vehicle signals inputted to the Touch Screen (TS). These signals include:

  • Lights (on or off)
  • Ambient light sensor voltage
  • Backlight dimming duty
  • Graphic illumination dimming duty
  • Vehicle speed, GPS speed, MOST km/h
  • Battery voltage
  • Reverse gear / electric park brake position (on or off)
  • Speed inhibit
  • MOST Fibre Optic Transceiver (FOT) temperature
  • Output audio allocation

Video Inputs Test

This screen will allow the testing of video inputs that are connected to the Touch Screen (TS). These include:

  • Companion camera
  • Rear view / proximity camera
  • TV/DVD

Self Test

Performs system self-diagnosis and displays the diagnostic results.

If an abnormality is present, a DTC is displayed.


Display the MOST connection status, and reception/transmission messages related to MOST.

"Mpr" displays the number of MOST devices existing on MOST. When "0" or "1" is displayed, communication is not possible.

Colour bar

This function allows the technician to test the colours generated by the Touch Screen (TS). A second screen displays six solid colours, selecting the colour will fill the screen with the chosen colour and pressing the Touch Screen (TS) again will revert back to the colour test screen.


Update the navigation program.

For details on the update method, refer to the "Navigation Update Tool" operation manual.

HDD information

Display information on the Hard Disc Drive (HDD).

SMART test (Self-Monitoring Analysis and Reporting Technology) is initiated from this screen

Vehicle information

Display information on the vehicle.

Car configuration - Displays information on vehicle environment settings.

  • Unit (distance) - Units of distance
  • Unit (time) - Units of time
  • Language - Displayed language
  • Fuel information - Remaining fuel quantity
  • Mileage information - Vehicle mileage display
  • Time information - Current time display
  • Override information - Status of switch operation inhibitions (Setting status of switches that cannot be operated.)

GPS information - Display GPS related information.

  • Received position - Displays the latitude and longitude (displayed in degrees, minutes, and seconds) for the position information calculated by GPS.
  • Map matched position - Displays the latitude and longitude (displayed in degrees, minutes, and seconds) for the position information being used for map matching.
  • Satellites - Number of acquired satellites.
  • Current address - Address of the current location.
  • Satellite Information - Displays satellite information for up to 12 GPS satellite search targets.
  • Measurement HDOP - Positioning accuracy.
  • Status - Positioning status.
  • Date - Displays the current date and time in the following order: day, month, year, hour, minute, second. The year is displayed using the four-digit western calendar; time is displayed in Greenwich Mean Time (GMT).

Vehicle sensor - Display vehicle signals inputted to the Touch Screen (TS).

  • REV - Reverse signal status.
  • Speed - Current vehicle speed.
  • Speed pulse count - Speed pulse count value.
  • Distance calibration - Learning information for distance calibration.
  • Voltage/Offset - Gyro sensor output voltage value/voltage correction value.
  • Relative bearing - Relative bearing (0º when navigation is started.)
  • Gyro sense - Learning value for gyro sensitivity.
  • Reset - Resets the gyro sensor relative bearing value.

RDS-TMC information - Display RDS-TMC related information.

  • Date/time (GMT) - Date and time for the TMC signal.
  • Frequency - TMC signal frequency.
  • PI code - Personal identification code for the broadcast station.
  • PS name - Broadcast station name.
  • Country code - Database country code.
  • LTN - Database location number (location table number.)
  • Service ID - Service provider identification number.
  • Air data - TMC data.


Check the volume for the voice recognition microphone inputted to the Touch Screen (TS). These include:

  • PTT switch status - Checks the PTT switch connection. When the PTT switch is pressed, a signal will be outputted, and the indicator displays in green.
  • Microphone input level judging - If a sampling of the user's voice command is at or above the threshold value, the indicator displays in blue.
  • Microphone level - Displays the microphone input level.

Voice output check

Check the audio output.

  • ON (Normal) - Outputs ADPCM voice (1 kHz sine wave) for five seconds.
  • ON (Max) - Outputs ADPCM voice (maximum 1 kHz sine wave) for five seconds.


  1. Verify the customer concern.
  2. Visually inspect for obvious signs of damage, water ingress and system integrity.
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

Visual Inspection


  • Battery
  • Fuses
  • Central and Battery Junction Boxes
  • Megafuses
  • Wiring harness
  • Damaged, loose or corroded connectors
  • Touch Screen (TS)
  • GPS antenna
  • TV antenna
  • Satellite antenna
  • FM antenna
  • Companion camera
  • Rear view camera
  • Microphone
  • Accessory USB Unit (AUU)
  • Steering wheel controls
  • Clock spring
  • Integrated Head Unit (IHU)
  • Audio amplifier
  • Anti-lock Brake System control module (ABS)
  • Wheel speed sensors
  • Vehicle Information and Communication System (VICS Japan only) receiver
  • VICS beacon antenna (Japan only)
  • Controller Area Network (CAN) circuits
  • Media Oriented System Transport (MOST) system
  • Gigabit Video Interface (GVIF)
  • Central Junction Box (CJB)
  • Terrain response
  • Mobile telephone


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