Diagnostics and testing of the navigation system (Discovery 3)

Touch Screen Display (TSD) and Navigation System Diagnostic Functions

The TSD and navigation module perform self-diagnostics, allowing the mechanic to identify faults in the system. Fault codes can be retrieved/diagnostics can also be performed using a Land Rover approved diagnostic system.

TSD diagnostics

Built-in diagnostic functions allow you to identify errors in the operation of the TSD. The mechanic can test the system according to the following points:

• Hardware Key Operation
• Touch screen operation
• Video input
• Video color channels (RGB)
• Car horns
• Self-diagnosis
• System configuration
• Vehicle configuration
• Functioning of the MOST ring network

Access to the built-in diagnostic system is carried out as follows:

• After turning on the system, enter the main menu "Home".
• Press the top center of the screen for about 5 seconds, then press the navigation system hardware key (Discovery - lower left, Range Rover - upper right).
• A window will appear "Diag PIN Entry", enter the access code 753.
• Once the system accepts the code, a diagnostic menu will appear on the screen.

Checking the display hardware keys

The test is performed to check the functionality of two hardware keys built into the TSD. If a key is working properly, when you press the corresponding icon on the screen, the latter will be displayed on a green background.

Testing the touch screen

By entering the touch screen test mode, the mechanic can check the screen's response to touch. He can either check the screen's functionality or recalibrate it. After pressing the key "Touch Check Switch" (Testing Touch Switches) the screen will be clear. When you touch the screen anywhere, the coordinates of the corresponding point are displayed. If you touch a faulty area of the screen, the coordinates will not be displayed on the screen.

Calibrating the screen will ensure that the coordinates match the point of touch by tapping on various "target" points on the screen as they are displayed.

Signals from vehicle systems

The "Signals from vehicle systems" function allows you to display signals coming to the TSD from other vehicle systems. These include:

• Battery voltage
• Lighting (on or off)
• Reduced brightness of instrument lighting
• Distribution of output audio signals
• PCB block temperature
• Speed limit (on or off)
• Temperature of the fiber optic transceiver of the MOST network
• Parking brake position (electric parking brake - engaged or disengaged)
• Touch display backlight PWM level
• Sound signal volume
• Sound signal timbre

Checking video inputs

This function allows you to test the TSD video inputs. These include TV/DVD inputs (television, connection with DVD player) rear Seat Entertainment (RSE) system.

Checking RGB colors

This function allows the mechanic to check the colors generated by the TSD. Six monochrome colors are displayed on the screen. Selecting any of them results in a solid fill of the screen with the selected color. Touching the TSD again returns it to the color selection mode.

Self-diagnosis

The self-diagnosis function displays the current TSD fault codes. In addition, the ignition switch status and battery voltage are displayed.

Two additional on-screen keys allow you to clear error codes and check TSD.

System configuration

The screen displays information about the TSD and the navigation module. Switching between the two components is done using the screen key in the upper left corner of the screen.

The following information is available:

• Vehicle type
• Component serial number
• Component catalog number
• Component group number
• Main Processor Bootloader Version
• The version of the main computer software
• Version of additional computer software
• Dedicated CAN bus database version

Vehicle configuration

Selecting the Vehicle Configuration option allows the mechanic to check which infotainment components are installed in the vehicle. This option is arranged over four screens, which can be navigated using the Forward and Back buttons.

MOST check

The MOST bus test screen displays information about the signals transmitted on this data bus. When using any part of the audio system, a message transmitted on the MOST bus appears on the screen. This allows you to identify faults associated with this data bus.

Diagnostics of the navigation system control module

Built-in diagnostic functions allow you to identify errors in the operation of the navigation module. The mechanic can test the system according to the following points:

• Information about the navigation system
• Information about system components
• Manual check
• Self-diagnosis

Each menu is divided into subsections for more detailed information.



Access to the built-in diagnostic system is carried out as follows:

• After turning on the system, enter the navigation system menu by pressing the hardware button of the navigation system.
• Agree to cancel the screen.
• Enter the main menu of the navigation system.
• Press the top center of the TSD for a while.
• A window will appear "Diag PIN Entry", enter the access code 753.

Once the system accepts the code, a diagnostic menu will appear on the screen. The menu has the following options:

• Information about the navigation system
• Manual check
• Information about system components
• Self-diagnosis

Navigation information

This menu item has three subsections:

• Car horns
• GPS information
• Reset position

Information about system components

When you select this option, the system will provide information about software components and versions.

Manual check

The menu provides the ability to perform the following tests:

• Checking the RGB colors of the navigation system screen
• Checking the microphone input level
• Checking the output signals of the voice message system

Self-diagnosis

Self-diagnosis consists of an internal check of the navigation system module"s serviceability with the display of fault codes on the TSD screen.

Inspection and verification

1. Check the validity of the customer's complaint.

2. Visually inspect for obvious electrical problems.

Electrical factors

Battery Fuses Central electrical distribution box and battery electrical distribution box Enlarged fuses Wiring harness Damaged, loose or corroded electrical connectors Touch Screen Display (TSD) GPS Antenna Navigation system module Steering wheel controls Spiral spring Integrated Head Unit (IHU) Audio amplifier Anti-lock Brake System (ABS) Control Module Wheel speed sensors VICS receiver for receiving messages from infrared and radio transmitters installed along the road (for Japan only) VICS Beacon Antenna (japan only) CAN electrical circuits MOST system (Media Orientated Systems Transport) Video Interface (GVIF) Central Junction Box (CJB)

3. If an obvious cause for the problem you identified or the customer described is found, correct it before proceeding with further actions. (if possible).



4. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before accessing the DTC Index.

Clear all DTCs after troubleshooting.

Table of signs of malfunction

Sign of malfunction	Possible reason	Operation
Loss of satellite signal reception	The vehicle is out of satellite coverage area GPS Antenna Circuit: Short to Ground, Short to Battery, High Resistance GPS antenna malfunction Navigation system module malfunction The antenna is disconnected	NOTE: It may take several minutes for the vehicle to acquire satellites after turning on the ignition. There is a possibility that the GPS antenna may lose signal from satellites in mountainous or heavily wooded areas, built-up areas, multi-story parking lots, tunnels, or during heavy rain/thunderstorms. Check for diagnostic trouble codes (DTCs) indicating a malfunction in the navigation system module.
TSD displays high temperature message and turns off	Most system fiber optic transceiver (FOT) overheating FOT temperature above 85°C	Check FOT MOST temperature via TSD diagnostic function (signals from vehicle systems). Once the temperature drops, the system will return to normal operation. If the system does not return to normal operation, check for DTCs indicating a malfunction in the infotainment system.
TSD displays low temperature message and turns off	TSD is too cold TSD temperature below -25°C	Check FOT MOST temperature via TSD diagnostic function (signals from vehicle systems). Once the temperature rises, the system will return to normal operation. If the system does not return to normal operation, check for DTCs indicating a malfunction in the infotainment system.
Blank screen	Temperature in passenger compartment too low Condensation in the passenger compartment Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p1.
No image on navigation screen (the screen does not change)	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p2.
Hardware switches do not work	Element failure Switch malfunction	Go to detailed check G830887p3.
Radio screen not displayed (range Rover only)	Element failure Switch malfunction	Go to detailed check G830887p4.
CD screen not displayed (range Rover only)	Element failure Switch malfunction	Go to detailed check G830887p5.
TV/DVD screen not displayed	Element failure Switch malfunction	Go to detailed check G830887p6.
AUX screen is not displayed. (range Rover only)	Element failure Switch malfunction	Go to detailed check G830887p7.
Display screen does not switch to low light mode	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p8.
Noise interference on every screen and abnormal colors	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p9.
Interference on the screen (incorrect synchronization)	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p10.
Abnormal screen color	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p11.
The disc with map information is not inserted/ejected	Break, short circuit, disconnection of the wiring harness Element failure Yandex. Disk with map information is malfunctioning	Go to detailed check G830887p12.
Touch switches do not work	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p13.
Significant deviation between the displayed vehicle position and the actual position	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p14.
GPS tag does not appear	Break, short circuit, disconnection of the wiring harness Element failure No reception from satellite	Go to detailed check G830887p15.
No sound	Break, short circuit, disconnection of the wiring harness Element failure Incorrect system settings	Go to detailed check G830887p16.
No voice recognition	Break, short circuit, disconnection of the wiring harness Element failure No disc with map information inserted	Go to detailed check G830887p17.
The current vehicle position marker rotates around its axis	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p18.
Vehicle position not updating	The disc with map information is dirty/damaged Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p19.
The route could not be calculated.	The disc with map information is dirty/damaged Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p20.
The map display on the screen is incomplete	The disc with map information is dirty/damaged Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p21.
The vehicle position mark moves in the opposite direction to the direction of travel	Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p22.
Unable to make or receive calls using Bluetooth phone - unable to connect to car	Incompatible bluetooth phone Incorrect initial connection settings Break, short circuit, disconnection of the wiring harness Element failure	Go to detailed check G830887p23.
The message is displayed "NAVIGATION NOT INSTALLED" (navigation system not installed)	There is no power supply or ground to the navigation module. Dedicated CAN bus failure	Refer to the electrical diagrams and check the power and ground circuits of the navigation module and the dedicated CAN bus circuit.
The message is displayed "NO NAVIGATION AVAILABLE" (navigation is not available)	GVIF Error Break, short circuit of the wiring harness	Perform GVIF checks, refer to electrical schematics and check wiring harness for shorts, opens

DTC Index

NOTE: If the control module is suspected and the vehicle is still under manufacturer warranty, refer to the warranty manual before installing a new module. (subsection B1.2), or determine if there is any previously approved special program in effect.

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) with three decimal places of accuracy and a current calibration certificate. When testing resistance, be sure to include the resistance of the DMM leads.

NOTE: Before running diagnostic programs using pinpoint tests, check and troubleshoot basic faults.

NOTE: Inspect electrical connectors for signs of water intrusion and connector posts for damage and/or corrosion.

NOTE: If DTCs are set and the fault is not present after performing pinpoint tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded terminals.

DTC	Description	Possible reason	Action
B100E25	Input video signal "A"	No connection at input (green connector) TV/DVD malfunction	Check your TV/DVD connection (green connector). Check the TV/DVD system for DTCs.
B101025	Input video signal "C"	No connection at input Camera malfunction	Make sure the camera is connected and working properly.
B1A0049	Control module	Touch Screen Display (TSD) Internal Electrical Malfunction (may occur in multiple modules) Internal electrical fault in amplifier (this code can be registered in multiple modules)	Check the module power and ground circuits. Refer to the electrical manual. If the module is suspected, refer to the warranty policy and procedures manual. Check and install a new front touchscreen display if necessary, refer to the new module/component installation note at the top of the DTC Index.
B1A8911	Satellite dish	NOTE: Navigation System Diagnostic Function Self-Test Code 803B GPS Antenna Electrical Circuit - Short to Ground GPS antenna malfunction Navigation system module malfunction	Check GPS antenna installation. Refer to electrical circuit diagrams and check GPS antenna circuit for short to ground. Check GPS antenna, install new antenna if necessary. Check and install new navigation module if necessary, refer to new module/component installation note at the top of DTC Index.
B1A8913	Satellite dish	NOTE: Navigation System Diagnostic Function Self-Test Code 80-3A Global Positioning System (GPS) Antenna - High Impedance This code may also be specified by the coaxial connector. GPS antenna malfunction	Check if the GPS antenna is installed correctly. Refer to the electrical diagrams and check the electrical circuit of the GPS antenna for an open circuit. Check the GPS antenna, install a new antenna if necessary.
B1B0049	Additional module "A"	NOTE: Navigation System Diagnostic Function Self-Check Code 8011, 58-02, 08-42, 08-43 Internal failure of the navigation module	Check the temperature conditions and the correct installation of the navigation module. If necessary, install a new navigation module, refer to the note on installing a new module/component at the top of this DTC Index
B1D6249	Additional module "B"	NOTE: Navigation System Diagnostic Function Self-Test Code 32-4B Vehicle Information and Communication System (VICS) Module - Internal Electrical Malfunction	Check the module power and ground circuits. Refer to the electrical manual. Check and install a new VICS module if necessary, refer to the New Module/Component Installation Note at the top of the DTC Index. If a module is suspected, refer to the Warranty Policy and Procedures manual.
B1D6287	Additional module "B"	NOTE: Navigation System Diagnostic Function Self-Test Code 3230 Vehicle Information and Communication System (VICS) Module Circuit Short to Ground VICS module electrical circuit - short circuit +battery VICS Module Circuit High Resistance VICS module is disconnected VICS module failure	Refer to the electrical circuit diagrams and check the VICS module circuits for a short to ground, short to battery, or open. Check and install a new VICS module if necessary, refer to the new module/component installation note at the top of the DTC Index. Configure the system using the approved diagnostic system.
U1A0087	Medium speed CAN bus	NOTE: Navigation system diagnostic function self-test code 0150, 01-51, 30-28, 30-D2 NOTE: A message is displayed "NAVIGATION NOT INSTALLED" (navigation system not installed) The navigation system module is disconnected CAN fault between navigation module and dedicated CAN bus TSD circuit Electrical circuit of the dedicated CAN bus - short circuit to ground, short circuit to +battery, open circuit	Check the system connections at the display and navigation module. Refer to the electrical diagrams and check the dedicated CAN network for short circuits, open circuits. Perform CAN network integrity tests using the manufacturer's approved diagnostic system. Refer to the "Network Data Exchange" section in the workshop manual.
U1A0131	Data exchange channel	NOTE: A message is displayed "NO NAVIGATION AVAILABLE" (navigation is not available) Navigation system module touch screen display (TSD), video interface (GVIF) malfunction GVIF disconnected GVIF - short to ground, short to battery +, open circuit	Check if the GVIF circuit connectors are connected correctly. Refer to the electrical diagrams and check the GVIF circuits of the multimedia module for short to ground, short to battery +, or open circuit.
U200531	Car speed	Vehicle speed signal circuit between ABS and navigation module - short circuit, open circuit	Check it out "SPD PULSE COUNT" (sPD pulse count) via the navigation system diagnostic function (screen of signals from vehicle systems). If the count remains at zero, refer to the electrical guides and check the vehicle speed signal circuit between the ABS module and the navigation system module for a short to ground, short to battery, or open.
U300068	Control module	NOTE: Navigation System Diagnostic Function Self-Test Code 3076 Touch screen (TSD), fiber optic transceiver Most system - overheating (temperature above 85°C) MOST transceiver overheating	An overheating message is displayed on the TSD before the infotainment system shuts down. Once the temperature has cooled, the system will return to normal operation. If the system does not return to normal operation, check for DTCs indicating a malfunction in the infotainment system. Refer to the electrical manuals and check the component power and ground circuits. Check the MOST circuit. Perform a general MOST test. Refer to the Network Communications section of the workshop manual and the approved diagnostic system. If a module is suspected, refer to the warranty policy and procedures manual.