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.
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HOMESERVICE MANUALSTOYOTA2007HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATIONMULTIPLEX COMMUNICATION SYSTEM - BEAN BUS
2007 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Multiplex Communication System - BEAN Bus
2007 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Multiplex Communication System - BEAN Bus
System Outline
The multiplex communication system communicates among the A/C control assembly, body ECU, combination meter, engine control module, option connector 1, power window master SW with ECU, sliding roof control ECU and theft deterrent ECU and controls the following systems according to the signals from respective sensors or switches.
Multiplex Communication System Includes Following Systems
- Air Conditioning (Automatic A/C)
- Air Conditioning (Manual A/C)
- Automatic Light Control
- Combination Meter
- Door Lock Control
- Electronically Controlled Transmission and A/T Indicator (3MZ-FE)
- Electronically Controlled Transmission and A/T Indicator (2AZ-FE)
- Engine Control (3MZ-FE)
- Engine Control (2AZ-FE)
- Headlight
- Interior Light
- Key Reminder
- Light Auto Turn Off System
- Moon Roof
- Navigation System
- Power Window
- Seat Belt Warning
- Theft Deterrent System
- Wireless Door Lock Control
The multiplex communication system communicates among the A/C control assembly, body ECU, combination meter, engine control module, option connector 1, power window master SW with ECU, sliding roof control ECU and theft deterrent ECU and controls the following systems according to the signals from respective sensors or switches.
Multiplex Communication System Includes Following Systems
- Air Conditioning (Automatic A/C)
- Air Conditioning (Manual A/C)
- Automatic Light Control
- Combination Meter
- Door Lock Control
- Electronically Controlled Transmission and A/T Indicator (3MZ-FE)
- Electronically Controlled Transmission and A/T Indicator (2AZ-FE)
- Engine Control (3MZ-FE)
- Engine Control (2AZ-FE)
- Headlight
- Interior Light
- Key Reminder
- Light Auto Turn Off System
- Moon Roof
- Navigation System
- Power Window
- Seat Belt Warning
- Theft Deterrent System
- Wireless Door Lock Control
RENDER: 1.0x
NO RELATED
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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.