Land Rover Discovery: Navigation System / Diagnosis and Testing
PRINCIPLES OF OPERATION
For a detailed description of the Navigation System, refer to the relevant
Description and Operation section in the workshop manual. REFER to:
Navigation System (415-01 Information and Entertainment System,
Description and Operation).
INSPECTION AND VERIFICATION
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT acceptable.
Substitution of control modules does not guarantee confirmation of a
fault, and may also cause additional faults in the vehicle being tested
and/or the donor vehicle.
NOTES:
- If a control module or a component is suspect and the vehicle
remains under manufacturer warranty, refer to the Warranty Policy
and Procedures manual, or determine if any prior approval
programme is in operation, prior to the installation of a new
module/component.
- When performing voltage or resistance tests, always use a digital
multimeter accurate to three decimal places, and with an up-todate
calibration certificate. When testing resistance always take the
resistance of the digital multimeter leads into account.
- Check and rectify basic faults before beginning diagnostic routines
involving pinpoint tests.
- Verify the customer concern
- Visually inspect for obvious signs of damage and system integrity
If an obvious cause for an observed or reported concern is found,
correct the cause (if possible) before proceeding to the next step
Visual Inspection
![](images/books/227/index342.jpg)
- If an obvious cause for an observed or reported concern is found,
correct the cause (if possible) before proceeding to the next step
- If the cause is not visually evident, verify the symptom and refer to
the
Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and
refer to the DTC Index
- Check DDW for open campaigns. Refer to the corresponding bulletins
and SSMs which may be valid for the specific customer complaint and
carry out the recommendations as required
SYMPTOM CHART
![SYMPTOM CHART](images/books/227/index343.jpg)
![SYMPTOM CHART](images/books/227/index344.jpg)
SYMPTOM:
Navigation soft key
missing from Touch
Screen (TS) menu
POSSIBLE CAUSES:
- Car configuration file
mismatch with vehicle
specification
ACTION:
NOTE:
After updating the car
configuration file, set the
ignition to on and wait 30
seconds before clearing the
DTCs.
- Using the manufacturer approved
diagnostic system, check and update
the car configuration file as
necessary. Clear the DTCs and
retest
SYMPTOM:
"Please insert map
SD card to enter
navigation"
message after
launching
navigation
POSSIBLE CAUSES:
ACTION:
- Insert map SD card into the
navigation control module
SYMPTOM:
"Agree" message
after launching
navigation
POSSIBLE CAUSES:
- Car configuration file
mismatch with vehicle
specification
ACTION:
NOTE:
After updating the car
configuration file, set the
ignition to on and wait 30
seconds before clearing the
DTCs.
- Using the manufacturer approved
diagnostic system, check and update
the car configuration file as necessary. Clear the DTCs and
retest
SYMPTOM:
Blank screen after
launching
navigation
POSSIBLE CAUSES:
Video in signal missing
- Navigation Control
Module (NCM) not
installed
- LVDS circuit short
circuit to ground,
short circuit to
power, open circuit,
high resistance
- Navigation Control
Module (NCM)
power or ground
circuit open circuit,
high resistance
- Medium speed CAN
bus circuit short
circuit to ground,
short circuit to
power, open circuit,
high resistance
ACTION:
SYMPTOM:
Unable to detect
position
POSSIBLE CAUSES:
GPS signal missing
- GPS receiver circuit
short circuit to
ground, short circuit
to power, open
circuit, high
resistance
ACTION:
SYMPTOM:
No navigation
audio
POSSIBLE CAUSES:
- Telephone mute circuit
short circuit to ground
- Navigation audio circuits
short circuit to ground,
short circuit to power,
open circuit, high
resistance
ACTION:
- Refer to the electrical circuit
diagrams and test the telephone
mute circuit for short circuit to
ground
- Refer to the electrical circuit
diagrams and test the audio
circuits for short circuit to ground,
short circuit to power, open
circuit, high resistance
PINPOINT TESTS
NOTES:
- The navigation control module is installed at the factory for China,
Hong Kong, Taiwan and Macau market vehicles.
- The navigation control module is not installed at the factory for
Korea, India and Israel market vehicles.
![PINPOINT TESTS](images/books/227/index345.jpg)
![PINPOINT TESTS](images/books/227/index346.jpg)
NAVIGATION CONTROL MODULE INSTALLED LOCATIONS
![NAVIGATION CONTROL MODULE INSTALLED LOCATIONS](images/books/227/index347.jpg)
![NAVIGATION CONTROL MODULE INSTALLED LOCATIONS](images/books/227/index348.jpg)
DTC INDEX
For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this
vehicle, please refer to Section 100-00. REFER to: (100-00 General
Information)
Diagnostic Trouble Code Index - DTC: Navigation Control Module (NCM) -
Extended Markets (Description and Operation),
Diagnostic Trouble Code Index - DTC: Navigation Control Module (NCM) -
Japan (Description and Operation).
READ NEXT:
PRINCIPLES OF OPERATION
For a detailed description of the Passenger Door Module, refer to the
relevant Description and Operation section in the workshop manual. REFER
to: Handles, Locks, Latches and E
COMPONENT LOCATION
Radio Frequency (RF) filter
Amplitude Modulation (AM)/Frequency Modulation (FM) antenna amplifier
Television (TV) antenna amplifier
TV antenna amplifier
Global Positioning Sy
SEE MORE:
REMOVAL
NOTE:
Removal steps in this procedure may contain installation details.
Refer to: Rear Door Trim Panel (501-05, Removal and Installation).
Release the clip.
NOTE:
Do not disassemble further if the component is removed for
access only.
Torque: 4.5 Nm
INSTALLATION
To install, reve
REMOVAL
CAUTION:
Protect the surrounding paintwork to avoid damage.
NOTES:
Removal steps in this procedure may contain installation details.
Make sure the door window glass is in the fully closed position.
LHD illustration shown, RHD is similar.
Refer to: Front Door Trim Panel (501-05, Removal