Navigation. Navigation System Problem Symptoms Table

Body Electrical. Lexus Is250, Is220D. Gse20 Ale20

Navigation. Lexus Is250, Is220D. Gse20 Ale20

Navigation System -- Problem Symptoms Table

HINT:

Before inspecting the suspected areas listed in the table below, check the fuse and relay.
Before inspecting the suspected areas listed in the table below, check the DTCs.
Methods used to verify the cause of the problem are listed in order of probability in the suspected area column.

Display function:
Symptom	Suspected area	See page
Pressing PWR switch does not turn on system.	1. Proceed to "Pressing Power Switch does not Turn ON System"	Click here
	2. Multi-display power source circuit	Click here
	3. AVC-LAN circuit	Click here
	4. Multi-display	Click here
Black screen (No image appears on navigation/audio screen).	1. Proceed to "No Image Appears on Multi-display"	Click here
	2. Multi-display power source circuit	Click here
	3. Illumination circuit	Click here
	4. AVC-LAN circuit	Click here
	5. Multi-display	Click here
Illumination for panel switch does not come on with TAIL switch on.	1. Proceed to "Illumination for Panel Switch does not Come on with Tail Switch ON"	Click here
	2. Illumination circuit	Click here
	3. Multi-display	Click here
Display does not dim (Night Screen) with TAIL switch on.	1. Proceed to "Display does not DIM when Light Control Switch is Turned ON"	Click here
	2. Illumination circuit	Click here
	3. Multi-display	Click here
Power does not turn off (The screen remains on).	1. Multi-display power source circuit	Click here
Power does not turn off (The screen remains on).	2. Multi-display	Click here
Panel switches do not function.	1. Proceed to "Panel Switches do not Function"	Click here
	2. Steering pad switch circuit	Click here
	3. Multi-display power source circuit	Click here
	4. Multi-display	Click here
Touch panel switch does not function.	1. Proceed to "Touch Panel Switch does not Function"	Click here
	2. Steering pad switch circuit	Click here
	3. Multi-display power source circuit	Click here
	4. Multi-display	Click here
Navigation screen is not displayed. (without Parking assist monitor system)	1. Proceed to "Display Signal Circuit between Navigation ECU and Multi-display"	Click here
	2. Map disc	-
	3. Navigation ECU	Click here
	4. Multi-display	Click here
Navigation screen flicker or color distortion. (without Parking assist monitor system)	1. Proceed to "Screen Flicker or Color Distortion"	Click here
	2. Proceed to "Display Signal Circuit between Navigation ECU and Multi-display"	Click here
	3. Navigation ECU	Click here
	4. Multi-display	Click here
Navigation screen is not displayed. (with Parking assist monitor system)	1. Proceed to "Display Signal Circuit between Navigation ECU and Television Camera ECU"	Click here
	2. Proceed to "Display Signal Circuit between Television Camera ECU and Multi-display"	Click here
	3. Map disc	-
	4. Navigation ECU	Click here
	5. Television camera ECU	Click here
	6. Multi-display	Click here
Navigation screen flicker or color distortion. (with Parking assist monitor system)	1. Proceed to "Screen Flicker or Color Distortion"	Click here
	2. Proceed to "Display Signal Circuit between Navigation ECU and Television Camera ECU"	Click here
	3. Proceed to "Display Signal Circuit between Television Camera ECU and Multi-display"	Click here
	4. Navigation ECU	Click here
	5. Television camera ECU	Click here
	6. Multi-display	Click here
DVD image cannot be displayed on multi-display. (Parking brake is on.) (*1)	1. Proceed to "Display Signal Circuit between Multi-display and Radio Receiver	Click here
	2. Parking brake switch circuit	Click here
	3. Radio Receiver	Click here
	4. Multi-display	Click here
Navigation function switches can be operated while vehicle is running.	Proceed to "Vehicle Speed Signal Circuit between Multi-display and Combination Meter"	Click here

*1: for DVD Changer Models

Navigation function:
Symptom	Suspected area	See page
Map disc cannot be inserted.	1. Proceed to "Map Disc cannot be Inserted"	Click here
	2. Navigation ECU power source circuit	Click here
	3. Navigation ECU	Click here
Map disc cannot be ejected.	1. Proceed to "Map Disc cannot be Ejected"	Click here
	2. Navigation ECU power source circuit	Click here
	3. Navigation ECU	Click here
Vehicle position mark deviates greatly.	1. Proceed to "Vehicle Position Mark Deviates Greatly"	Click here
	2. GPS antenna	Click here
	3. Navigation ECU	Click here
Cursor or map rotates when vehicle is stopped.	1. Proceed to "Cursor or Map Rotates when Vehicle is Stopped"	Click here
Cursor or map rotates when vehicle is stopped.	2. Navigation ECU	Click here
Vehicle position mark is not updated.	1. Proceed to "Vehicle Position Mark is not Updated"	Click here
	2. Map disc	-
	3. Navigation ECU	Click here
Current position display does not appear.	1. Proceed to "Current Position Display does not Appear"	Click here
	2. Map disc	-
	3. GPS antenna	Click here
	4. Navigation ECU	Click here
GPS Mark is not displayed.	1. Proceed to "GPS Mark is not Displayed"	Click here
	2. GPS antenna	Click here
	3. Navigation ECU	Click here
Voice guidance does not function.	1. Proceed to "Voice Guidance does not Function"	Click here
	2. Navigation voice circuit	Click here
	3. Map disc	-
	4. Navigation ECU	Click here
	5. Stereo component amplifier	Click here
Map display incomplete.	1. Proceed to "Map Display Incomplete"	Click here
	2. Map disc	-
	3. Navigation ECU	Click here
Route cannot be calculated.	1. Proceed to "Route cannot be Calculated"	Click here
	2. Map disc	-
	3. Navigation ECU	Click here
Voice recognition difficulty.	1. Proceed to "Voice Recognition Difficulty"	Click here
Voice recognition difficulty.	2. Navigation ECU	Click here
Voice is not recognized.	1. Proceed to "Voice is not Recognized"	Click here
	2. Proceed to "Microphone circuit between Overhead J/B and Multi-display"	Click here
	3. Proceed to "Microphone circuit between Multi-display and Navigation ECU"	Click here
	4. Steering pad switch circuit	Click here
	5. Microphone	Click here
	6. Microphone amplifier	Click here
	7. Navigation ECU	Click here
Speed signal does not change in the navigation check mode.	Proceed to "Vehicle Speed Signal Circuit between Navigation ECU and Multi-display"	Click here
Reverse signal does not change in the navigation check mode.	Proceed to "Reverse Signal Circuit"	Click here
RDS-TMC does not function (*1)	1. Proceed to "RDS-TMC does not Function"	Click here
	2. Proceed to "RDS-TMC Signal Circuit"	Click here
	3. Navigation ECU	Click here
	4. Multi-display	Click here
	5. Radio receiver	Click here

*1: for Europe Models

Steering pad switch function:
Symptom	Suspected area	See page
The system cannot be operated by the steering pad switch.	1. Steering pad switch circuit	Click here
The system cannot be operated by the steering pad switch.	2. Radio receiver	Click here
Illumination for steering pad switch does not come on with tail switch on.	1. Illumination circuit	Click here
	2. Radio receiver	Click here

Bluetooth function:
Symptom	Suspected area	See page
Cellular phone registration failure, phone directory transfer failure.	Proceed to "Cellular Phone Registration Failure, Phone Directory Transfer Failure"	Click here
Cellular phone cannot send/receive.	1. Proceed to "Cellular Phone cannot Send/Receive"	Click here
	2. Steering pad switch circuit	Click here
	3. Radio receiver	Click here
Cannot call in a certain place.	Proceed to "Cannot call in a Certain Place"	Click here
The other callers voice cannot be heard, is too quiet, or distorted.	1.Proceed to "The Other Callers Voice cannot be Heard, is too Quiet, or Distorted"	Click here
	2. Multi-display	Click here
The other caller cannot heard your voice, or your voice is too quiet or distorted.	1. Proceed to "The Other Caller cannot Heard Your Voice, or Your Voice is too Quiet or Distorted"	Click here
	2. Proceed to "Microphone circuit between Overhead J/B and Multi-display"	Click here
	3. Microphone	Click here
	4. Microphone amplifier	Click here
	5. Multi-display	Click here