Problem Symptoms Table
WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
DISPLAY FUNCTION
PROBLEM SYMPTOM CHART
| Symptom | Suspected area | See |
|---|---|---|
| Black screen (No image appears on navigation and audio screen) | "BLACK SCREEN (NO IMAGE APPEARS ON NAVIGATION AND AUDIO SCREEN)" | BLACK SCREEN (NO IMAGE APPEARS ON NAVIGATION AND AUDIO SCREEN) |
| Dimmer signal circuit | DIMMER SIGNAL CIRCUIT | |
| Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Replace multi-display | REMOVAL | |
| Illumination for panel switch does not come on with TAIL switch on | "ILLUMINATION FOR PANEL SWITCH DOES NOT COME ON WITH TAIL SWITCH ON" | ILLUMINATION FOR PANEL SWITCH DOES NOT COME ON WITH TAIL SWITCH ON |
| Dimmer signal circuit | DIMMER SIGNAL CIRCUIT | |
| Replace multi-display | REMOVAL | |
| Display does not dim (Night Screen) with TAIL switch on | "DISPLAY DOES NOT DIM (NIGHT SCREEN) WITH TAIL SWITCH ON" | DISPLAY DOES NOT DIM (NIGHT SCREEN) WITH TAIL SWITCH ON |
| Dimmer signal circuit | DIMMER SIGNAL CIRCUIT | |
| Replace multi-display | REMOVAL | |
| Power does not turn off (The screen remains on) | Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT |
| Replace multi-display | REMOVAL | |
| Panel switches do not function | "PANEL SWITCHES DO NOT FUNCTION" | PANEL SWITCHES DO NOT FUNCTION |
| Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Replace multi-display | REMOVAL | |
| Touch panel switch does not function | "TOUCH PANEL SWITCH DOES NOT FUNCTION" | TOUCH PANEL SWITCH DOES NOT FUNCTION |
| Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Replace multi-display | REMOVAL | |
| Screen is distorted | Display signal circuit between television camera ECU and multi-display | DISPLAY SIGNAL CIRCUIT BETWEEN TELEVISION CAMERA ECU AND MULTI-DISPLAY |
| Replace navigation ECU | REMOVAL | |
| Replace multi-display | REMOVAL | |
| Screen flicker or color distortion | "SCREEN FLICKER OR COLOR DISTORTION" | SCREEN FLICKER OR COLOR DISTORTION |
| Replace navigation ECU | REMOVAL | |
| Replace multi-display | REMOVAL | |
| No switches function 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
PROBLEM SYMPTOM CHART
| Symptom | Suspected area | See |
|---|---|---|
| Map disc cannot be inserted | "MAP DISC CANNOT BE INSERTED" | MAP DISC CANNOT BE INSERTED |
| Navigation ECU power source circuit | NAVIGATION ECU POWER SOURCE CIRCUIT | |
| Replace navigation ECU | REMOVAL | |
| Map disc cannot be ejected | Navigation ECU power source circuit | NAVIGATION ECU POWER SOURCE CIRCUIT |
| Replace navigation ECU | REMOVAL | |
| Vehicle position mark deviates greatly | "VEHICLE POSITION MARK DEVIATES GREATLY" | VEHICLE POSITION MARK DEVIATES GREATLY |
| Replace GPS antenna assembly | REMOVAL | |
| Replace navigation ECU | REMOVAL | |
| Cursor or map rotates when vehicle is stopped | "CURSOR OR MAP ROTATES WHEN VEHICLE IS STOPPED" | CURSOR OR MAP ROTATES WHEN VEHICLE STOPPED |
| Replace navigation ECU | REMOVAL | |
| Vehicle position mark is not updated | "VEHICLE POSITION MARK IS NOT UPDATED" | VEHICLE POSITION MARK IS NOT UPDATED |
| Replace map disc | - | |
| Replace navigation ECU | REMOVAL | |
| GPS mark is not displayed | "GPS MARK IS NOT DISPLAYED" | GPS MARK IS NOT DISPLAYED |
| Replace GPS antenna assembly | REMOVAL | |
| Replace navigation ECU | REMOVAL | |
| Voice guidance does not function | "VOICE GUIDANCE DOES NOT FUNCTION" | VOICE GUIDANCE DOES NOT FUNCTION |
| Speaker circuit (navigation voice) | NAVIGATION VOICE SPEAKER CIRCUIT | |
| Replace map disc | - | |
| Replace stereo component amplifier | REMOVAL | |
| Replace navigation ECU | REMOVAL | |
| Map display incomplete | "MAP DISPLAY INCOMPLETE" | MAP DISPLAY INCOMPLETE |
| Replace map disc | - | |
| Replace navigation ECU | REMOVAL | |
| Route cannot be calculated | "ROUTE CANNOT BE CALCULATED" | ROUTE CANNOT BE CALCULATED |
| Replace map disc | - | |
| Replace navigation ECU | REMOVAL | |
| Voice recognition difficulty (Except Taiwan) | "VOICE RECOGNITION DIFFICULTY" | VOICE RECOGNITION DIFFICULTY |
| Replace navigation ECU | REMOVAL | |
| Voice is not recognized (Except Taiwan) | "VOICE IS NOT RECOGNIZED" | VOICE IS NOT RECOGNIZED |
| Microphone circuit between overhead J/B and multi-display | MICROPHONE CIRCUIT BETWEEN OVERHEAD J/B AND MULTI-DISPLAY | |
| Replace microphone | - | |
| Replace microphone amplifier | REMOVAL | |
| Replace navigation ECU | REMOVAL | |
| Replace multi-display | REMOVAL |
STEERING PAD SWITCH FUNCTION
PROBLEM SYMPTOM CHART
| Symptom | Suspected area | See |
|---|---|---|
| Voice navigation cannot be operated with steering pad switch | Replace steering pad switch | REMOVAL |
| Replace radio receiver assembly | REMOVAL |
BLUETOOTH FUNCTION
PROBLEM SYMPTOM CHART
| Symptom | Suspected area | See |
|---|---|---|
| Cellular phone registration failure, phone directory transfer failure | "CELLULAR PHONE REGISTRATION FAILURE, PHONE DIRECTORY TRANSFER FAILURE" | CELLULAR PHONE REGISTRATION FAILURE, PHONE DIRECTORY TRANSFER FAILURE |
| Cellular phone cannot send / receive | "CELLULAR PHONE CANNOT SEND / RECEIVE" | CELLULAR PHONE CANNOT SEND / RECEIVE |
| Own voice cannot be heard, too quiet or distorted | "OWN VOICE CANNOT BE HEARD, TOO QUIET OR DISTORTED" | OWN VOICE CANNOT BE HEARD, TOO QUIET OR DISTORTED |
| Replace navigation ECU | REMOVAL | |
| Replace multi-display | REMOVAL | |
| Cannot call in a certain place | "CANNOT CALL IN A CERTAIN PLACE" | CANNOT CALL IN A CERTAIN PLACE |
| Voice on phone cannot be heard, too quiet or distorted | "VOICE ON PHONE CANNOT BE HEARD, TOO QUIET OR DISTORTED" | VOICE ON PHONE CANNOT BE HEARD, TOO QUIET OR DISTORTED |
| Replace navigation ECU | REMOVAL | |
| Replace multi-display | REMOVAL |