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.
Master Switch Assembly
Battery voltage is applied to power window relay when ignition switch is in RUN position through 10-amp fuse No. 10 (Accent) or fuse No. 16 (Elantra and Tiburon), located in passenger compartment fuse panel. On Sonata, battery voltage is supplied by way of power window fusible link (30-amp) in underhood relay block, to the master switch assembly through relay's closed contacts. When either switch in the master switch assembly is operated, battery voltage is applied to the power window motor. The motor is then grounded through the opposite contact in the master switch assembly.
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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.