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.
2008 Lexus LX 570FACTORY OEM SERVICE PROCEDURE
Power Window Master Switch: Inspection
- INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
- Check that the LED illuminates.
- Apply battery voltage to the master switch and check that the LED illuminates.
OK
CONDITION CHARTMeasurement Condition Specified Condition Battery positive (+) → 18 (LED)
Battery negative (-) → 12 (GND)LED illuminates If the result is not as specified, replace the multiplex network master switch assembly.
- Apply battery voltage to the master switch and check that the LED illuminates.
- Check that the LED illuminates.
Factory Service Tools
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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.