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 DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSHEADLAMPHEADLAMP CONTROL MODULESERVICE HINTS
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)
Service Hints
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)SECTION Service Hints
LIGHT AUTO TURN OFF
B9 (A), B10 (B), B12 (D) BODY ECU
(D) 9 - GROUND : Always approx. 12 volts
(A) 5 - GROUND : Approx. 12 volts with the ignition SW at ON position
(B) 17 - GROUND : Continuity with the light control SW at HEAD position
K4 UNLOCK WARNING SW
2 - 1 : Closed with the ignition key in the cylinder
B9 (A), B10 (B), B12 (D) BODY ECU
(D) 9 - GROUND : Always approx. 12 volts
(A) 5 - GROUND : Approx. 12 volts with the ignition SW at ON position
(B) 17 - GROUND : Continuity with the light control SW at HEAD position
K4 UNLOCK WARNING SW
2 - 1 : Closed with the ignition key in the cylinder
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.