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.
2015 Lexus RX 350 Base, FWDFACTORY OEM SERVICE PROCEDURE
Navigation System
NAVIGATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1321 | Lost Communication with EMV |
| B1323 | Lost Communication with Haptic Device |
| B1567 | HUD Disconnected |
| B1575 | GVIF Disconnected (from EMV/MM Integrated Device to Multi Display) |
| B1579 | Voice Recognition Microphone Disconnected |
| B1585 | USB Device Malfunction |
| B15C0 | GPS Antenna Connection Malfunction (short) |
| B15C1 | GPS Antenna Connection Malfunction (break) |
| B15C3 | Speaker Output Short |
| B15D0 | MOST Communication Malfunction |
| B15D3 | Stereo Component Amplifier Disconnected |
| B15D5 | Rear Seat Entertainment System Disconnected |
| B15D6 | Display Disconnected |
| B15DB | Telematics Transceiver Disconnected |
| B15FE | XM Tuner Antenna Disconnected |
| B15FF | XM Tuner Antenna Short |
| B1551 | HD Radio Tuner Malfunction |
| B15A0 | LAN Master Malfunction |
| B15A3 | Stereo Component Amplifier Malfunction |
| B15A6 | Display Malfunction |
| B15AD | Navigation Processor Malfunction |
| B15AF | Haptic Device Malfunction |
| B15B0 | Display Screen Malfunction |
| B15B3 | Radio Tuner Malfunction |
| B15B5 | DVD Changer Malfunction |
| B15B7 | Bluetooth Module Malfunction |
| B15B8 | Harddisk Malfunction |
| B15BA | XM Tuner Malfunction |
| B15C2 | Speed Signal Malfunction |
| B15E7 | Harddisk Reading/Writing Malfunction (Low Temperature) |
| B15E8 | Harddisk Reading/Writing Malfunction (High Temperature) |
| B15F5 | A/C ECU Vehicle Information Reading/Writing Processor Malfunction |
| B15F6 | Main Body ECU Vehicle Information Reading/Writing Process Malfunction |
| B15F7 | Certification ECU Vehicle Information Reading/Writing Process Malfunction |
| B15F8 | Driver Seat ECU Vehicle Information Reading/Writing Process Malfunction |
| B15F9 | UART Communication Malfunction (for A/C) |
| U0073 | Sending Malfunction (Navigation to APGS) |
| U0100 | Lost Communication with ECM |
| U0140 | Lost Communication with Body Control Module |
| U0155 | Meter ECU Communication |
| U1110 | Clearance Sonar ECU Communication |
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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