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.
2021 Lexus RX 350 Base, FWDFACTORY OEM SERVICE PROCEDURE
Navigation System
NAVIGATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [09/2015 - 12/2017]
| DTC Code | Description |
|---|---|
| B1321 | Lost Communication with EMV |
| B1322 | Lost Communication with Display |
| B1323 | Lost Communication with Haptic Device |
| B1324 | Lost Communication with Meter |
| B1325 | Lost Communication with HUD |
| B1326 | Lost Communication with Clock Device (Local-CAN) |
| B1542 | Clock Device Disconnected (Local-CAN) |
| B1551 | HD Radio Tuner Malfunction |
| B1563 | Haptic Device Disconnected |
| B1575 | GVIF Disconnected (from EMV/MM Integrated Device to Multi Display) |
| B1579 | Voice Recognition Microphone Disconnected |
| B1585 | USB Device Malfunction |
| B158C | SD Card Communication Malfunction |
| B158F | AV Signal Stoppage (Low Battery Voltage) |
| B15A0 | LAN Master Malfunction |
| B15A3 | Stereo Component Amplifier Malfunction |
| B15A6 | Display Malfunction |
| B15AD | Navigation Processor Malfunction |
| B15AF | Haptic Device Malfunction |
| B15B0 | Display Screen Malfunction |
| B15B2 | Digital TV Tuner Malfunction |
| B15B3 | Radio Tuner Malfunction |
| B15B4 | CD Changer Malfunction |
| B15B5 | DVD Changer Malfunction |
| B15B7 | Bluetooth Module Malfunction |
| B15BA | XM Tuner Malfunction |
| B15C0 | GPS Antenna Connection Malfunction (short) |
| B15C1 | GPS Antenna Connection Malfunction (break) |
| B15C2 | Speed Signal Malfunction |
| B15C3 | Speaker Output Short |
| B15D0 | MOST Communication Malfunction |
| B15D3 | Stereo Component Amplifier Disconnected |
| B15D6 | Display Disconnected |
| B15D8 | Monitor Disconnected |
| B15DB | Telematics Transceiver Disconnected |
| B15F5 | Air Conditioner 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 | D-Seat ECU Vehicle Information Reading/Writing Process Malfunction |
| B15F9 | UART Communication Malfunction (for A/C) |
| B15FE | XM Tuner Antenna Disconnected |
| B15FF | XM Tuner Antenna Short |
| C1610 | Camera ECU Malfunction |
| U0073 | Sending Malfunction (Navigation to APGS) |
| U0100 | Engine ECU Communication |
| U0129 | VSC (ECB) ECU Communication |
| U0140 | Lost Communication with Body Control Module |
| U0155 | Meter ECU Communication |
| U0163 | Lost Communication with Navigation Control Module |
| U0164 | Air Conditioner ECU Communication |
| U0198 | Lost Communication with Telematic Control Module |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U1110 | Clearance Sonar ECU Communication |
NAVIGATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [12/2017 - 08/2019]
| DTC Code | Description |
|---|---|
| B1321 | Lost Communication with EMV |
| B1322 | Lost Communication with Display |
| B1323 | Lost Communication with Haptic Device |
| B1324 | Lost Communication with Meter |
| B1325 | Lost Communication with HUD |
| B1326 | Lost Communication with Clock Device (Local-CAN) |
| B1542 | Clock Device Disconnected (Local-CAN) |
| B1551 | HD Radio Tuner Malfunction |
| B1563 | Haptic Device Disconnected |
| B1575 | GVIF Disconnected (from EMV/MM Integrated Device to Multi Display) |
| B1579 | Voice Recognition Microphone Disconnected |
| B1585 | USB Device Malfunction |
| B158C | SD Card Communication Malfunction |
| B158F | AV Signal Stoppage (Low Battery Voltage) |
| B15A0 | LAN Master Malfunction |
| B15A3 | Stereo Component Amplifier Malfunction |
| B15A6 | Display Malfunction |
| B15AD | Navigation Processor Malfunction |
| B15AF | Haptic Device Malfunction |
| B15B0 | Display Screen Malfunction |
| B15B2 | Digital TV Tuner Malfunction |
| B15B3 | Radio Tuner Malfunction |
| B15B4 | CD Changer Malfunction |
| B15B5 | DVD Changer Malfunction |
| B15B7 | Bluetooth Module Malfunction |
| B15BA | XM Tuner Malfunction |
| B15C0 | GPS Antenna Connection Malfunction (short) |
| B15C1 | GPS Antenna Connection Malfunction (break) |
| B15C2 | Speed Signal Malfunction |
| B15C3 | Speaker Output Short |
| B15D0 | MOST Communication Malfunction |
| B15D3 | Stereo Component Amplifier Disconnected |
| B15D6 | Display Disconnected |
| B15D8 | Monitor Disconnected |
| B15DB | Telematics Transceiver Disconnected |
| B15F5 | Air Conditioner 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 | D-Seat ECU Vehicle Information Reading/Writing Process Malfunction |
| B15F9 | UART Communication Malfunction (for A/C) |
| B15FE | XM Tuner Antenna Disconnected |
| B15FF | XM Tuner Antenna Short |
| C1610 | Camera ECU Malfunction |
| U0073 | Sending Malfunction (Navigation to APGS) |
| U0100 | Engine ECU Communication |
| U0129 | VSC (ECB) ECU Communication |
| U0140 | Lost Communication with Body Control Module |
| U0155 | Meter ECU Communication |
| U0163 | Lost Communication with Navigation Control Module |
| U0164 | Air Conditioner ECU Communication |
| U0198 | Lost Communication with Telematic Control Module |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U1110 | Clearance Sonar ECU Communication |
NAVIGATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [08/2019 - ]
| DTC Code | Description |
|---|---|
| B1323 | Lost Communication with Haptic Device |
| B1324 | Lost Communication with Meter |
| B1325 | Lost Communication with HUD |
| B1326 | Lost Communication with Clock Device (Local-CAN) |
| B1535 | NTSC Disconnected (from Park Assist/Monitoring ECU) |
| B153A | GVIF Disconnected (from Extension Module to H/U) |
| B1543 | Extension Module Disconnected 2 |
| B1551 | HD Radio Tuner Malfunction |
| B1556 | Extension Module Malfunction 2 |
| B1559 | Touch Pad Sensor Malfunction |
| B155A | Touch Pad Vibration Driver Malfunction |
| B155B | Touch Pad Memory Module Malfunction |
| B1574 | GVIF Disconnected (from Park Assist/Monitoring ECU to EMV/MM Integrated Device) |
| B1575 | GVIF Disconnected (from EMV/MM Integrated Device to Multi Display) |
| B1579 | Voice Recognition Microphone Disconnected |
| B1585 | USB Device Malfunction |
| B158F | AV Signal Stoppage (Low Battery Voltage) |
| B15A0 | LAN Master Malfunction |
| B15A3 | Stereo Component Amplifier Malfunction |
| B15A6 | Display Malfunction |
| B15AD | Navigation Processor Malfunction |
| B15B0 | Display Screen Malfunction |
| B15B3 | Radio Tuner Malfunction |
| B15B4 | CD Changer Malfunction |
| B15B5 | DVD Changer Malfunction |
| B15B7 | Bluetooth Module Malfunction |
| B15BA | XM Tuner Malfunction |
| B15C0 | GPS Antenna Connection Malfunction (short) |
| B15C1 | GPS Antenna Connection Malfunction (break) |
| B15C2 | Speed Signal Malfunction |
| B15C3 | Speaker Output Short |
| B15D0 | MOST Communication Malfunction |
| B15D3 | Stereo Component Amplifier Disconnected |
| B15D6 | Display Disconnected |
| B15DB | Telematics Transceiver Disconnected |
| B15F5 | Air Conditioner 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 | D-Seat ECU Vehicle Information Reading/Writing Process Malfunction |
| B15F9 | UART Communication Malfunction (for A/C) |
| B15FE | XM Tuner Antenna Disconnected |
| B15FF | XM Tuner Antenna Short |
| C1610 | Camera ECU Malfunction |
| C1622 | Back Camera Disconnected |
| U0073 | Sending Malfunction (Navigation to APGS) |
| U0100 | Engine ECU Communication |
| U0129 | VSC (ECB) ECU Communication |
| U0140 | Lost Communication with Body Control Module |
| U0155 | Meter ECU Communication |
| U0164 | Air Conditioner ECU Communication |
| U0198 | Lost Communication with Telematic Control Module |
| U023B | Lost Communication with Image Processing Module "B" |
| U0265 | Lost Communication with Image Processing Sensor A |
| U1110 | Clearance Sonar ECU Communication |
Factory Service Tools
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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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