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.
System Outline
The multiplex communication system communicates among the gateway ECU, driver side J/B ECU, passenger side J/B ECU, luggage room J/B ECU, driver door ECU, passenger door ECU, theft deterrent ECU, transponder key computer, sliding roof control ECU, power seat ECU (Driver's seat), power seat ECU (Front passenger's seat), combination meter, skid control ECU, airbag sensor assembly, engine control module, A/C control assembly, tire pressure warning ECU, combination SW, steering pad SW, front controller, tilt and telescopic ECU, radio and player, multi-display, AFS ECU, data link connector 3, translate ECU and controls the following systems according to the signals from respective sensors or switches.
Multiplex Communication System Includes Following Systems
* Adaptive Front-Lighting System
* Audio System
* Automatic Light Control
* Back-Up Light
* Electric Tension Reducer
* Front Fog Light
* Fuel Lid Opener
* Garage Door Opener
* Headlight
* Horn
* Illumination
* Interior Light
* Key Reminder
* LEXUS Navigation System
* Light Auto Turn Off System
* Luggage Compartment Door Opener
* Mirror Heater
* Power Window
* Rear Window Defogger
* Remote Control Mirror
* Seat Belt Warning
* Stop Light
* Taillight
* Theft Deterrent and Door Lock Control
* Turn Signal and Hazard Warning Light
* Wiper and Washer
* Wireless Door Lock Control
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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