Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
- Inspect the fuses and relays before troubleshooting the suspected areas shown in the table below.
- Methods used to verify the cause of the problem are listed in order of probability in the Suspected Area column.
Display function:
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Black screen (No image appears on navigation / audio screen). | 1. "No Image Appears on Multi-display" | NO IMAGE APPEARS ON MULTI-DISPLAY |
| 2. Illumination circuit | ILLUMINATION CIRCUIT | |
| 3. Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| 4. AVC-LAN Circuit | AVC-LAN CIRCUIT | |
| 5. Replace multi-display | REMOVAL | |
| Illumination for navigation controller does not come on with TAIL switch on. | 1. Illumination circuit | ILLUMINATION CIRCUIT |
| 2. Replace navigation controller | NAVIGATION CONTROLLER | |
| Display does not dim (Night Screen) with TAIL switch on. | 1. "Display does not Dim when Light Control Switch is Turned ON" | DISPLAY DOES NOT DIM WHEN LIGHT CONTROL SWITCH IS TURNED ON |
| 2. Illumination circuit | ILLUMINATION CIRCUIT | |
| 3. Replace multi-display | REMOVAL | |
| Power does not turn off (Screen remains on). | 1. Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT |
| 2. Navigation controller power source circuit | NAVIGATION CONTROLLER POWER SOURCE CIRCUIT | |
| 3. Switch Signal Circuit between Multi-display and Navigation Controller | SWITCH SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND NAVIGATION CONTROLLER | |
| 4. Replace multi-display | REMOVAL | |
| 5. Replace navigation controller | NAVIGATION CONTROLLER | |
| Navigation controller does not function. | 1. "Panel Switches do not Function" | PANEL SWITCHES DO NOT FUNCTION |
| 2. Multi-display power source circuit | MULTI-DISPLAY POWER SOURCE CIRCUIT | |
| 3. Navigation controller power source circuit | NAVIGATION CONTROLLER POWER SOURCE CIRCUIT | |
| 4. Switch Signal Circuit between Multi-display and Navigation Controller | SWITCH SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND NAVIGATION CONTROLLER | |
| 5. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT | |
| 6. Replace navigation controller | NAVIGATION CONTROLLER | |
| 7. Replace multi-display | REMOVAL | |
| Only navigation screen is not displayed. | 1. Display Signal Circuit between Navigation ECU and Multi-display | DISPLAY SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND MULTI-DISPLAY |
| 2. Replace map disc | - | |
| 3. Replace multi-display | REMOVAL | |
| 4. Replace navigation ECU | NAVIGATION ECU | |
| Screen flicker or color distortion | 1. "Screen Flicker or Color Distortion" | SCREEN FLICKER OR COLOR DISTORTION |
| 2. Display Signal Circuit between Navigation ECU and Multi-display | DISPLAY SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND MULTI-DISPLAY | |
| 3. Replace map disc | - | |
| 4. Replace multi-display | REMOVAL | |
| 5. Replace navigation ECU | NAVIGATION ECU | |
| 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 | See |
|---|---|---|
| Map disc cannot be inserted. | 1. "MAP Disc cannot be Inserted" | MAP DISC CANNOT BE INSERTED |
| 2. Navigation ECU power source circuit | NAVIGATION ECU POWER SOURCE CIRCUIT | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| Map disc cannot be ejected. | 1. Navigation ECU power source circuit | NAVIGATION ECU POWER SOURCE CIRCUIT |
| 2. Replace navigation ECU | NAVIGATION ECU | |
| Vehicle position mark deviates greatly. | 1. "Vehicle Position Mark Deviates Greatly" | VEHICLE POSITION MARK DEVIATES GREATLY |
| 2. Replace GPS antenna | NAVIGATION ANTENNA | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| Cursor or map rotates when vehicle is stopped. | 1. "Cursor or MAP Rotates when Vehicle is Stopped" | CURSOR OR MAP ROTATES WHEN VEHICLE STOPPED |
| 2. Replace navigation ECU | NAVIGATION ECU | |
| Vehicle position mark is not updated. | 1. "Vehicle Position Mark is not Updated" | VEHICLE POSITION MARK IS NOT UPDATED |
| 2. Replace map disc | - | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| Current position display does not appear. | 1. "Current Position Display does not Appear" | CURRENT POSITION DISPLAY DOES NOT APPEAR |
| 2. Replace map disc | - | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| GPS mark is not displayed, | 1. "GPS Mark is not Displayed" | GPS MARK IS NOT DISPLAYED |
| 2. Replace GPS antenna | NAVIGATION ANTENNA | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| Voice guidance does not function. | 1. "Voice Guidance does not Function" | VOICE GUIDANCE DOES NOT FUNCTION |
| 2. Navigation Voice Speaker Circuit | NAVIGATION VOICE SPEAKER CIRCUIT | |
| 3. Replace map disc | - | |
| 4. Replace navigation ECU | NAVIGATION ECU | |
| Map display incomplete | 1. "MAP Display Incomplete" | MAP DISPLAY INCOMPLETE |
| 2. Replace map disc | - | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| Route cannot be calculated. | 1. "Route cannot be Calculated" | ROUTE CANNOT BE CALCULATED |
| 2. Replace map disc | - | |
| 3. Replace navigation ECU | NAVIGATION ECU | |
| Voice recognition difficulty | 1. "Voice Recognition Difficulty" | VOICE RECOGNITION DIFFICULTY |
| 2. Replace navigation ECU | NAVIGATION ECU | |
| Voice is not recognized. | 1. "Voice is not Recognized" | VOICE IS NOT RECOGNIZED |
| 2. Microphone Circuit between Overhead J/B and Navigation ECU | MICROPHONE CIRCUIT BETWEEN OVERHEAD J/B AND NAVIGATION ECU | |
| 3. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT | |
| 4. Replace microphone | REMOVAL | |
| 5. Replace microphone amplifier | REMOVAL | |
| 6. Replace navigation ECU | NAVIGATION ECU | |
| 7. Replace radio receiver | REMOVAL | |
| Speed signal does not change in the navigation check mode. | "Vehicle Speed Signal Circuit between Navigation ECU and Combination meter" | VEHICLE SPEED SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND COMBINATION METER |
| Reverse signal does not change in the navigation check mode. | "Reverse Signal Circuit" | REVERSE SIGNAL CIRCUIT |
Steering pad switch function:
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Voice navigation cannot be operated with steering pad switch. | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. Replace radio receiver | REMOVAL | |
| 3. Replace navigation ECU | NAVIGATION ECU |
"Bluetooth" function:
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| 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. | 1. Proceed to "Cellular Phone cannot Send / Receive" | CELLULAR PHONE CANNOT SEND / RECEIVE |
| 2. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT | |
| 3. Replace 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 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" | THE OTHER CALLER'S VOICE CANNOT BE HEARD, IS TOO QUIET, OR DISTORTED |
| 2. Proceed to "Cellular Phone Voice Circuit between Radio Receiver and Stereo Component Amplifier" | CELLULAR PHONE VOICE CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER | |
| 3. Speaker circuit | SPEAKER CIRCUIT | |
| 4. Replace radio receiver | REMOVAL | |
| 5. Replace stereo component amplifier | REMOVAL | |
| The other caller cannot hear your voice, or your voice is too quiet or distorted. | 1. 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 |
| 2. Proceed to "Microphone Circuit between Microphone and Radio Receiver" | MICROPHONE CIRCUIT BETWEEN MICROPHONE AND RADIO RECEIVER | |
| 3. Replace microphone | REMOVAL | |
| 4. Replace radio receiver | REMOVAL |