Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Section 46 (Navigation)
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- Navigation System
- Precaution
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- System Normal Condition Check
- Display Check Mode
- BLUETOOTH Voice Quality Set Mode
- Navigation Check Mode
- Diagnosis Display Detailed Description
- Problem Symptoms Table
- Terminals Of Ecu
- DTC Check / Clear
- Adjustment
- Display does not Dim when Light Control Switch is Turned ON
- Panel Switches do not Function
- Touch Panel Switch does not Function
- Display Panel does not Open, Tilt or Tilts Improperly
- Screen Flicker or Color Distortion
- MAP Disc cannot be Inserted
- Vehicle Position Mark Deviates Greatly
- Cursor or MAP Rotates when Vehicle Stopped
- Vehicle Position Mark is not Updated
- Current Position Display does not Appear
- GPS Mark is not Displayed
- Voice Guidance does not Function
- MAP Display Incomplete
- Route cannot be Calculated
- GYRO Error
- MAP Disc Read Error
- Speed Signal Error
- Voice Recognition Difficulty
- Voice is not Recognized
- Cellular Phone Registration Failure, Phone Directory Transfer Failure
- Cellular Phone cannot Send / Receive
- Cannot Call in a Certain Place
- Voice on Phone cannot be Heard, too Quiet or Distorted
- Own Voice cannot be Heard, too Quiet or Distorted
- Black Screen
- Steering Pad Switch Circuit
- Illumination Circuit
- Parking Brake Switch Circuit
- AVC-LAN Circuit between Radio Receiver and Stereo Component Amplifier
- AVC-LAN Circuit between Radio Receiver and Gateway ECU
- AVC-LAN Circuit between Navigation ECU and Stereo Component Tuner
- AVC-LAN Circuit between Radio Receiver and Multi-Display
- Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter
- Vehicle Speed Signal Circuit between Multi-display and Combination Meter
- Reverse Signal Circuit
- Navigation Voice Speaker Circuit
- Display Signal Circuit between Navigation ECU and Multi-display
- Cellular Phone Voice Circuit between Multi-display and Navigation ECU
- Microphone Circuit between Overhead Junction Block and Multi-display
- Microphone Circuit between Multi-display and Navigation ECU
- Mute Signal Circuit between Stereo Component Amplifier Assembly and Navigation ECU
- Door Control Switch Circuit
- Multi-display Power Source Circuit
- Navigation ECU Power Source Circuit
- Navigation Ecu
- Navigation Antenna
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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