Lexus IS250 IS220d GSE20 ALE20 - NAVIGATION

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

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

*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
The system cannot be operated by the steering pad switch.	2. Radio receiver
Illumination for steering pad switch does not come on with tail switch on.	1. Illumination circuit
	2. Radio receiver

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"
Cellular phone cannot send/receive.	1. Proceed to "Cellular Phone cannot Send/Receive"
	2. Steering pad switch circuit
	3. Radio receiver
Cannot call in a certain place.	Proceed to "Cannot call in a Certain Place"
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"
	2. Multi-display
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"
	2. Proceed to "Microphone circuit between Overhead J/B and Multi-display"
	3. Microphone
	4. Microphone amplifier
	5. Multi-display

LEXUS IS250, IS220d / GSE20 ALE20

NAVIGATION

Lexus IS250 IS220d GSE20 ALE20

NAVIGATION SYSTEM