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 MANUALSTOYOTA2001HIGHLANDER 2WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWDESCRIPTION OF ON-BOARD DIAGNOSTICS
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)
Description of On-Board Diagnostics
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)SECTION Description of On-Board Diagnostics
MULTIPLEX COMMUNICATION SYSTEM (BEAN)
Body Electronics Area Network (BEAN) communication line is used for body, meters and air-conditioning controls. Since the line is loop-shaped, the communication can be kept by the line that is not open even if a part of the line becomes open for some reasons. In case that the line becomes short (bus-down) for some reasons, however, all the BEAN communication will be impossible and some DTC will be output.
HINT: When bus-down occurs, communication from related ECU will stop. Therefore, outputs of DTC will be impossible, so perform a DTC (SAE code) inspection with TOYOTA hand-held tester.
Body Electronics Area Network (BEAN) communication line is used for body, meters and air-conditioning controls. Since the line is loop-shaped, the communication can be kept by the line that is not open even if a part of the line becomes open for some reasons. In case that the line becomes short (bus-down) for some reasons, however, all the BEAN communication will be impossible and some DTC will be output.
HINT: When bus-down occurs, communication from related ECU will stop. Therefore, outputs of DTC will be impossible, so perform a DTC (SAE code) inspection with TOYOTA hand-held tester.
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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.