Check the interior electrical panel under the dashboard first if a device stops working; most lighting, audio, and accessory circuits are routed there. Use the printed chart on the cover to match each slot with its assigned circuit, then verify amperage before replacing any blown element.
The engine bay power distribution unit handles high-load systems such as cooling fans, charging components, and control modules. Disconnect the battery before accessing this area to prevent short circuits. Each relay and link is labeled with an alphanumeric code that corresponds to the circuit chart, allowing quick identification without guesswork.
Always replace a damaged link with the same amperage rating; installing a higher-rated part can damage wiring or electronic modules. A simple test light or multimeter helps confirm continuity and locate faults faster than visual inspection alone, especially for hairline breaks inside the element.
2012 Toyota Prius C Fuse Box Diagram and Fuse Identification
Locate the cabin electrical panel beneath the steering column and match each slot number with the chart printed on the cover to identify the correct circuit before removing any component.
Use a puller tool to extract the small blade-type element and inspect the metal strip inside; a broken or burned section confirms failure. Check the amperage rating stamped on top and replace it only with the same value such as 7.5A, 10A, or 15A.
The engine compartment power distribution unit sits near the battery and contains larger links for systems like radiator fans, ABS, and hybrid control modules. Each position is labeled with codes such as HTR, EFI, or FAN, which correspond to specific vehicle functions.
Cross-reference the labeling on the lid with the vehicle manual to avoid confusion between similar abbreviations. For example, ACC typically refers to accessory circuits, while IG relates to ignition-controlled lines.
Mini blade elements are used in the interior panel, while low-profile or cartridge types may appear under the hood. Mixing these formats is not possible, so confirm the physical size before installation.
If multiple systems fail at once, inspect shared circuits like ACC or DOME, as they often feed several components through a single protected link.
Use a multimeter set to continuity mode to test each slot without removing the part; place probes on the exposed metal contacts on top to verify current flow.
Never install a higher-rated replacement, since wiring in this compact hybrid is designed for specific loads, and exceeding limits may lead to insulation damage or control unit failure.
Interior fuse box location and function of each fuse in cabin panel
Open the lower dash cover on the driver side to reach the cabin electrical block; the slot index printed inside the lid shows circuit names tied to each position. Check labels like ACC, GAUGE, and DOME to trace power supply for accessories, instrument cluster, and interior lighting, as these lines often control multiple components at once.
Match amperage values to function: smaller ratings such as 7.5A typically support sensors and control units, mid-range 10A lines feed audio and outlets, while 15A handles moving parts like wipers or window motors. Use a tester on the exposed metal tabs to confirm continuity without removal, then replace only with the same rating if the internal strip is broken.