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.
2014 Lexus ES 350FACTORY OEM SERVICE PROCEDURE
Can Communication System
SUB BUS 1 (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) OUTPUT DTCS (TECHSTREAM DISPLAY: MAIN BODY)) 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 |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt and Telescopic Module |
SUB BUS 2 (NETWORK GATEWAY ECU OUTPUT DTCS (TECHSTREAM DISPLAY: GATEWAY)) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| U0104 | Lost Communication with Driving Support ECU |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U1002 | Lost Communication with Gateway Module (Network Gateway ECU) |
| U1100 | Lost Communication with Seat Belt Control ECU |
| U023A | Lost Communication with Front Camera Module |
SUB BUS 13 (DRIVING SUPPORT ECU ASSEMBLY OUTPUT DTCS (TECHSTREAM DISPLAY: PRE-COLLISION 2)) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| 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
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.