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.
2022 Lexus RX 350 Base, FWDFACTORY OEM SERVICE PROCEDURE
Can Communication System
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [09/2015 - 12/2017]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0230 | Lost Communication with Rear Gate Module |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt & Telescopic Module |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [12/2017 - ]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0230 | Lost Communication with Rear Gate Module |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt & Telescopic Module |
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.