Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. 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
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer To |
|---|---|---|
| Pressing power switch does not turn on system | Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT |
| AVC-LAN circuit | AVC-LAN CIRCUIT | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Black screen (no image appears on navigation/audio screen) | Proceed to "No Image Appears on Multi-display" | NO IMAGE APPEARS ON MULTI-DISPLAY |
| Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Illumination circuit | AVC-LAN CIRCUIT | |
| AVC-LAN circuit | AVC-LAN CIRCUIT | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| 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 FOR PANEL SWITCH DOES NOT COME ON WITH TAIL SWITCH ON |
| Illumination circuit | ILLUMINATION CIRCUIT | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Display does not dim (night screen) with tail switch on | Proceed to "Display does not DIM when Light Control Switch is Turned ON" | DISPLAY DOES NOT DIM WHEN LIGHT CONTROL SWITCH IS TURNED ON |
| Dimmer signal circuit | DIMMER SIGNAL CIRCUIT | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Power does not turn off (the screen remains on) | Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Panel switches do not function | Proceed to "Panel Switches do not Function" | PANEL SWITCHES DO NOT FUNCTION |
| Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT | |
| Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Touch panel switch does not function | Proceed to "Touch Panel Switch does not Function" | TOUCH PANEL SWITCH DOES NOT FUNCTION |
| Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT | |
| Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Navigation screen is not displayed | Map disc | - |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| Navigation screen flicker or color distortion | Proceed to "Screen Flicker or Color Distortion" | SCREEN FLICKER OR COLOR DISTORTION |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| DVD image cannot be displayed on multi-display (parking brake is on) | Proceed to "Display Signal Circuit between Multi-display and Radio Receiver" | DISPLAY SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND RADIO RECEIVER |
| Parking brake switch circuit | PARKING BRAKE SWITCH CIRCUIT | |
| Radio receiver | REMOVAL | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| 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 MULTI-DISPLAY AND COMBINATION METER |
Navigation function
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer To |
|---|---|---|
| Map disc cannot be inserted | Proceed to "Map Disc cannot be Inserted" | MAP DISC CANNOT BE INSERTED |
| Navigation ECU power source circuit | NAVIGATION ECU POWER SOURCE CIRCUIT | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Map disc cannot be ejected | Proceed to "Map Disc cannot be Ejected" | MAP DISC CANNOT BE EJECTED |
| Navigation ECU power source circuit | NAVIGATION ECU POWER SOURCE CIRCUIT | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Vehicle position mark deviates greatly | Proceed to "Vehicle Position Mark Deviates Greatly" | VEHICLE POSITION MARK DEVIATES GREATLY |
| Navigation antenna assembly | NAVIGATION ANTENNA | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Cursor or map rotates when vehicle is stopped | Proceed to "Cursor or Map Rotates when Vehicle is Stopped" | CURSOR OR MAP ROTATES WHEN VEHICLE STOPPED |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Vehicle position mark is not updated | Proceed to "Vehicle Position Mark is not Updated" | VEHICLE POSITION MARK IS NOT UPDATED |
| Map disc | - | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Current position display does not appear | Proceed to "Current Position Display does not Appear" | CURRENT POSITION DISPLAY DOES NOT APPEAR |
| Map disc | - | |
| Navigation antenna assembly | NAVIGATION ANTENNA | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| GPS Mark is not displayed | Proceed to "GPS Mark is not Displayed" | GPS MARK IS NOT DISPLAYED |
| Navigation antenna assembly | NAVIGATION ANTENNA | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Voice guidance does not function | Proceed to "Voice Guidance does not Function" | VOICE GUIDANCE DOES NOT FUNCTION |
| Navigation voice circuit | NAVIGATION VOICE SPEAKER CIRCUIT | |
| Map disc | - | |
| Stereo component amplifier | REMOVAL | |
| Map display incomplete | Proceed to "Map Display Incomplete" | MAP DISPLAY INCOMPLETE |
| Map disc | - | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Route cannot be calculated | Proceed to "Route cannot be calculated" | ROUTE CANNOT BE CALCULATED |
| Map disc | - | |
| Navigation ECU | NAVIGATION ECU (FOR DVD) | |
| Speed signal does not change in navigation check mode | Vehicle speed signal circuit between navigation ECU and combination meter | VEHICLE SPEED SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND MULTI-DISPLAY |
| Reverse signal does not change in navigation check mode | Reverse signal circuit | REVERSE SIGNAL CIRCUIT |
Steering pad switch function
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer To |
|---|---|---|
| The system cannot be operated by steering pad switch | Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| Radio receiver | REMOVAL | |
| Illumination for steering pad switch does not come on with tail switch on | Illumination circuit | ILLUMINATION CIRCUIT |
| Radio receiver | REMOVAL |
Rear power seat module switch function
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer To |
|---|---|---|
| The system cannot be operated by rear power seat module switch | Rear power seat module switch power source circuit | REAR SEAT CONTROL SWITCH POWER SOURCE CIRCUIT |
| AVC-LAN circuit | AVC-LAN CIRCUIT | |
| Rear power seat module switch (for Power Seat) | REMOVAL | |
| Rear power seat module switch (for Ottoman) | REMOVAL | |
| Rear power seat module switch (for Fixed Seat Type) | REMOVAL | |
| Radio receiver | REMOVAL |
"Bluetooth" function
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer To |
|---|---|---|
| Cellular phone registration failure, phone directory transfer failure | Proceed to "Cellular Phone Registration Failure, Phone Directory Transfer Failure" | CELLULAR PHONE REGISTRATION FAILURE, PHONE DIRECTORY TRANSFER FAILURE |
| Cellular phone cannot send/receive | Proceed to "Cellular Phone cannot Send/Receive" | CELLULAR PHONE CANNOT SEND/RECEIVE |
| Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT | |
| Radio receiver | REMOVAL | |
| Cannot call in a certain place | Proceed to "Cannot call in a Certain Place" | CANNOT CALL IN A CERTAIN PLACE |
| The other caller's voice cannot be heard, is too quiet, or distorted | Proceed to "The Other Caller's Voice cannot be Heard, is too Quiet, or Distorted" | THE OTHER CALLER'S VOICE CANNOT BE HEARD, IS TOO QUIET, OR DISTORTED |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) | |
| 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" | 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 CIRCUIT BETWEEN OVERHEAD J/B AND MULTI-DISPLAY | |
| Microphone | REMOVAL | |
| Microphone amplifier | - | |
| Multi-display | MULTI-DISPLAY (W/ NAVIGATION SYSTEM) |