Problem Symptoms Table
WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Display function
DISPLAY FUNCTION
| Symptom | Suspected Area |
|---|---|
| Pressing power switch does not turn on system. | MULTI-DISPLAY POWER SOURCE CIRCUIT |
| AVC-LAN CIRCUIT | |
| Multi-display | |
| Black screen (no image appears on navigation/audio screen). | Proceed to NO IMAGE APPEARS ON MULTI-DISPLAY |
| MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| ILLUMINATION CIRCUIT | |
| AVC-LAN CIRCUIT | |
| GVIF cable | |
| DISPLAY SIGNAL CIRCUIT BETWEEN DISC PLAYER CHANGER AND MULTI-DISPLAY | |
| Multi-display | |
| Illumination for panel switch does not come on with TAIL switch on. | Proceed to ILLUMINATION FOR PANEL SWITCH DOES NOT COME ON WITH TAIL SWITCH ON |
| ILLUMINATION CIRCUIT | |
| Multi-display | |
| Display does not dim (night screen) with tail switch on. | Proceed to DISPLAY DOES NOT DIM WHEN LIGHT CONTROL SWITCH IS TURNED ON |
| ILLUMINATION CIRCUIT | |
| Multi-display | |
| Power does not turn off (the screen remains on). | MULTI-DISPLAY POWER SOURCE CIRCUIT |
| Multi-display | |
| Panel switches do not function. | Proceed to PANEL SWITCHES DO NOT FUNCTION |
| STEERING PAD SWITCH CIRCUIT | |
| MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Multi-display | |
| Touch panel switch does not function. | Proceed to TOUCH PANEL SWITCH DOES NOT FUNCTION |
| STEERING PAD SWITCH CIRCUIT | |
| MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Multi-display | |
| Navigation screen is not displayed. | Map disc |
| GVIF cable | |
| Navigation ECU | |
| Multi-display | |
| Navigation screen flicker or color distortion. | Proceed to SCREEN FLICKER OR COLOR DISTORTION |
| Navigation ECU | |
| Multi-display | |
| DVD image cannot be displayed on multi-display (parking brake is on). | DISPLAY SIGNAL CIRCUIT BETWEEN DISC PLAYER CHANGER AND MULTI-DISPLAY |
| PARKING BRAKE SWITCH CIRCUIT | |
| Radio receiver | |
| Multi-display | |
| Navigation function switches can be operated while vehicle is running. | VEHICLE SPEED SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND COMBINATION METER |
| VEHICLE SPEED SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND COMBINATION METER |
Navigation function
NAVIGATION FUNCTION
| Symptom | Suspected Area |
|---|---|
| Map disc cannot be inserted. | Proceed to MAP DISC CANNOT BE INSERTED |
| NAVIGATION ECU POWER SOURCE CIRCUIT | |
| Navigation ECU | |
| Map disc cannot be ejected. | Proceed to MAP DISC CANNOT BE EJECTED |
| NAVIGATION ECU POWER SOURCE CIRCUIT | |
| Navigation ECU | |
| Vehicle position mark deviates greatly. | Proceed to VEHICLE POSITION MARK DEVIATES GREATLY |
| Navigation antenna | |
| Navigation ECU | |
| Cursor or map rotates when vehicle is stopped. | Proceed to CURSOR OR MAP ROTATES WHEN VEHICLE STOPPED |
| Navigation ECU | |
| Vehicle position mark is not updated. | Proceed to VEHICLE POSITION MARK IS NOT UPDATED |
| Map disc | |
| Navigation ECU | |
| Current position display does not appear. | Proceed to CURRENT POSITION DISPLAY DOES NOT APPEAR |
| Map disc | |
| Navigation antenna | |
| Navigation ECU | |
| GPS Mark is not displayed. | Proceed to GPS MARK IS NOT DISPLAYED |
| Navigation antenna | |
| Navigation ECU | |
| Voice guidance does not function. | Proceed to VOICE GUIDANCE DOES NOT FUNCTION |
| NAVIGATION VOICE SPEAKER CIRCUIT | |
| Map disc | |
| Stereo component amplifier | |
| Map display incomplete. | Proceed to MAP DISPLAY INCOMPLETE |
| Map disc | |
| GVIF cable | |
| Navigation ECU | |
| Route cannot be calculated. | Proceed to ROUTE CANNOT BE CALCULATED |
| Map disc | |
| Navigation ECU | |
| Voice recognition difficulty. | Proceed to VOICE RECOGNITION DIFFICULTY |
| Navigation ECU | |
| Voice is not recognized | Proceed to VOICE IS NOT RECOGNIZED |
| MICROPHONE CIRCUIT BETWEEN OVERHEAD J/B AND MULTI-DISPLAY | |
| STEERING PAD SWITCH CIRCUIT | |
| Microphone | |
| Microphone amplifier | |
| Navigation ECU | |
| Speed signal does not change in navigation check mode. | VEHICLE SPEED SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND COMBINATION METER |
| Reverse signal does not change in navigation check mode. | REVERSE SIGNAL CIRCUIT |
Steering pad switch function
STEERING PAD SWITCH FUNCTION
| Symptom | Suspected Area |
|---|---|
| System cannot be operated by steering pad switch. | STEERING PAD SWITCH CIRCUIT |
| Radio receiver | |
| Illumination for steering pad switch does not come on with tail switch on. | ILLUMINATION CIRCUIT |
| Radio receiver |
"Bluetooth" function
"BLUETOOTH" FUNCTION
| Symptom | Suspected Area |
|---|---|
| Cellular phone registration failure, phone directory transfer failure. | Proceed to CELLULAR PHONE REGISTRATION FAILURE, PHONE DIRECTORY TRANSFER FAILURE |
| Cellular phone cannot send/receive. | Proceed to CELLULAR PHONE CANNOT SEND/RECEIVE |
| STEERING PAD SWITCH CIRCUIT | |
| 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. | Proceed to THE OTHER CALLER'S VOICE CANNOT BE HEARD, IS TOO QUIET, OR DISTORTED |
| Multi-display | |
| The other caller cannot hear your voice, or your voice is too quiet or distorted. | Proceed to THE OTHER CALLER CANNOT HEAR YOUR VOICE, OR YOUR VOICE IS TOO QUIET OR DISTORTED |
| MICROPHONE CIRCUIT BETWEEN OVERHEAD J/B AND MULTI-DISPLAY | |
| Microphone | |
| Microphone amplifier | |
| Multi-display |
Sound function
SOUND FUNCTION
| Symptom | Suspected Area |
|---|---|
| DVD sound cannot be heard or sound quality is bad. | DISC PLAYER CHANGER POWER SOURCE CIRCUIT |
| Sound signal circuit disc player changer and radio receiver | |
| Disc player changer | |
| Radio receiver | |
| Cassette tape cannot be inserted or played. | RADIO RECEIVER POWER SOURCE CIRCUIT |
| Proceed to CASSETTE TAPE CANNOT BE INSERTED OR PLAYED | |
| Cassette tape cannot be ejected. | RADIO RECEIVER POWER SOURCE CIRCUIT |
| Proceed to CASSETTE TAPE CANNOT BE EJECTED | |
| Sound quality is bad only when playing tape. | Proceed to "Sound Quality is Bad Only when Playing Tape" |
| Tape is tangled due to incorrect tape speed or auto-reverse malfunction. | Proceed to TAPE IS TANGLED DUE TO INCORRECT TAPE SPEED OR AUTO-REVERSE MALFUNCTION |