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 Toyota 4Runner TrailFACTORY OEM SERVICE PROCEDURE
Can Communication System
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| U0100 | Lost Communication with ECM / PCM "A" |
| U0164 | Lost Communication with A/C ECU |
| U1002 | Lost Communication with Gateway Module (Power Management2) |
| U0208 - Power source or inside front power seat switch LH - Front power seat switch LH branch wire or connector - Front power seat switch LH |
Lost Communication with "Seat Control Module A" |
| U1002 | |
| - Front power seat switch LH branch wire or connector - Main body ECU (multiplex network body ECU) main wire or connector - Combination meter assembly main wire or connector - Main body ECU (multiplex network body ECU) - Combination meter assembly - Front power seat switch LH - No. 2 junction connector - MS bus circuit |
Main body ECU (multiplex network body ECU) |
| U1114 | Lost Communication with Main Switch 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.
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