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 MANUALSTOYOTA20184RUNNER SR5, 4WDREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSWINDOWS / GLASS - SERVICE INFORMATIONPOWER WINDOW MASTER SWITCHINSPECTION [08/2015 - ]PROCEDURE
2018 Toyota 4Runner SR5, 4WD
Inspection [08/2015 - ]: Procedure
2018 Toyota 4Runner SR5, 4WDSECTION Procedure
- INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
- Check that the LED illuminates.
- Apply battery voltage to the master switch and check that the LEDs illuminate.
OK
Measurement Condition Specified Condition Battery positive (+) → 18 (LED)
Battery negative (-) → 12 (GND)LEDs illuminate - If the result is not as specified, replace the multiplex network master switch assembly.
TEXT IN ILLUSTRATION*a Component without harness connected
(Multiplex Network Master Switch Assembly)*b LED
- Apply battery voltage to the master switch and check that the LEDs illuminate.
- Check that the LED illuminates.
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.