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.
2017 Lexus ES 350FACTORY OEM SERVICE PROCEDURE
CAN COMMUNICATION SYSTEM (W/ Central Gateway ECU)
CENTRAL GATEWAY ECU DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
SUB BUS 1 (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 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" |
| U0209 | Lost Communication with "Seat Control Module B" |
| U0230 | Lost Communication with Rear Gate Module |
| U0265 | Lost Communication with Parking Assist Monitor Module |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt and Telescopic Module |
SUB BUS 13 (DRIVING SUPPORT ECU ASSEMBLY DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| U023A | Lost Communication with Front Camera Module |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U1002 | Lost Communication with Gateway Module (Sensor Bus) |
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.