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.
2012 Lexus RX 350 AWDFACTORY OEM SERVICE PROCEDURE
Can Communication System
MAIN BODY ECU OUTPUT DTCS (TECHSTREAM DISPLAY/MAIN BODY) SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| 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) |
| U1115 | Lost Communication with Tilt and Telescopic Module |
POWER MANAGEMENT CONTROL ECU OUTPUT DTCS (TECHSTREAM DISPLAY/POWER MANAGEMENT 1) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| U0104 | Lost Communication with Driving Support ECU |
| U0114 | Lost Communication with 4WD Control ECU |
| U0182 | Lost Communication with AFS ECU |
| U1002 | Lost Communication with Gateway Module (Power Management1) |
| U1100 | Lost Communication with Seat Belt Control ECU |
| U1110 | Lost Communication with Clearance Sonar Module |
| U1110 | Lost Communication with Clearance Sonar Module |
| U110B | Lost Communication with Parking Assist Control Module "B" |
POWER MANAGEMENT CONTROL ECU OUTPUT DTCS (TECHSTREAM DISPLAY/POWER MANAGEMENT 2) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| U0100 | Lost Communication with ECM / PCM |
| U0164 | Lost Communication with A/C ECU |
| U1002 | Lost Communication with Gateway Module (Power Management2) |
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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