Check the cabin panel under the left side of the dashboard first, then inspect the engine bay power distribution unit near the battery. Match the amperage rating printed on each insert with the vehicle manual before replacing anything, as incorrect values can damage control modules.
Inside the passenger compartment, the panel is hidden behind a trim cover. Remove it carefully to access rows of blade-type inserts labeled for systems such as audio, climate control, and interior lighting. Use a plastic puller tool to avoid bending contacts, and verify each slot against the printed legend to prevent confusion between similar circuits.
Under the hood, the main distribution unit contains higher-capacity links and relays tied to ignition, cooling fans, and fuel delivery. Look for signs of heat damage or corrosion around terminals, as these indicate deeper electrical faults rather than a simple blown insert. Always disconnect the negative battery terminal before working in this area.
For troubleshooting, test continuity with a multimeter instead of relying only on visual inspection. A broken internal strip is not always visible. Document the original position of each component before removal so reassembly matches the factory layout and prevents misrouting of circuits.
2012 Lexus RX 350 fuse box diagram and fuse locations guide
Locate the interior power panel behind the lower dash trim on the driver side and use the printed chart on the cover to identify each circuit. Match symbols to systems like power seats, infotainment, and cabin lighting, then verify amperage values before swapping any insert to avoid overload or malfunction.
Open the engine compartment and find the main distribution unit near the battery; it contains high-capacity links for starter, cooling fans, and fuel system relays. Use a multimeter to check continuity across suspected failed elements, and inspect terminals for discoloration or looseness, which often indicates heat buildup or poor contact rather than a simple break in the strip.
Interior fuse box location under dashboard and fuse assignment list
Remove the lower left dash cover near the steering column to access the cabin electrical panel; it is secured by clips and pulls outward without tools. Check the label on the back of this cover to identify circuit positions before touching any component.
Use the assignment chart to locate circuits for power windows, seat adjustment, audio system, and interior lighting. Each slot is marked with a number and symbol, while amperage ratings such as 10A, 15A, or 20A indicate the load limit. Always replace a burned element with the same rating to prevent wiring damage or control unit faults.
Inspect rows carefully, as similar markings can lead to mistakes during replacement.
Test suspected failures with a multimeter set to continuity mode instead of relying on visual checks alone, because the metal strip inside may break without visible signs; keep track of each removed piece and return it to its original position to maintain correct circuit mapping.