Check the under-hood power distribution block first if multiple systems stop working at once. This unit, mounted near the battery, contains high-amperage links for the starter, cooling fans, and ABS module. Use the lid map to match each slot with its circuit and verify ratings such as 30A, 40A, or 50A before any replacement.
Inside the cabin, the panel located beneath the dashboard on the driver side handles lower-load circuits like audio, interior lighting, and accessory outlets. Pull each protective element with a plastic extractor and inspect the metal strip inside; a visible break indicates failure. Always install a part with identical amperage to prevent wiring damage.
For accurate troubleshooting, cross-check circuit labels with system behavior. For example, loss of power windows often traces to a 25A slot in the interior block, while headlight issues usually relate to separate relays and higher-rated links under the hood. Keep a spare set of mini and low-profile components in the glove box to handle roadside issues without delay.
2016 Toyota RAV4 Fuse Diagram with Box Locations and Circuit Details
Open the engine bay power block near the battery to check high-load circuits first, especially if systems like cooling fans or ABS stop working. This unit contains large cartridge links rated between 30A and 60A, each tied to components such as radiator fans, ignition, and braking control modules.
The interior panel under the driver-side dashboard manages lower-load electrical lines. It includes slots for audio, power outlets, dashboard lighting, and door locks, typically rated from 7.5A to 25A. Use the printed layout on the cover to match each slot with its assigned function.
Identify each slot by both number and label, since similar ratings can serve different systems. For example, two 15A positions may control separate circuits like the cigarette lighter and infotainment unit, so placement accuracy matters.
Relays positioned in the engine compartment handle switching for headlights, horn, and fuel pump. These components do not show visible damage when faulty, so swapping with an identical relay from a non-critical system can help confirm issues.
If multiple cabin electronics fail at once, inspect shared power lines such as ACC or IG circuits. These feed several components simultaneously, and a single damaged link can disable radio, charging ports, and dashboard indicators together.
Always disconnect the battery before working with any electrical distribution block to prevent short circuits. Use needle-nose pliers or a dedicated puller tool, and never install a higher-rated replacement, as this increases the risk of wiring overheating and component failure.
Engine compartment fuse box layout and fuse assignment list
Locate the power distribution box next to the battery and remove the plastic cover to access high-current protection elements. Use the underside map to identify each slot by number and circuit name before touching anything.
Main links in this compartment usually include 30A to 60A ratings for systems such as radiator fans, electric power steering, and ABS. These large cartridge units differ from smaller blade types and require firm, even pressure for removal.
Positions labeled ALT or MAIN connect directly to the charging system and battery supply lines. If these fail, the vehicle may lose charging capability or fail to start, so inspect them first when power loss affects multiple systems.
Cooling fan circuits often use 40A or higher ratings and are paired with relays nearby. If the engine temperature rises while fans remain inactive, check both the high-current slot and the corresponding relay in the same box.
Headlight and horn circuits are typically assigned 10A to 20A slots, positioned closer to the outer edge of the block for easier access. Matching the label with the exact slot prevents confusion between similar ratings placed side by side.
Always reinstall the cover securely after inspection to protect internal contacts from moisture and dirt. Keep spare high-amperage cartridges in the correct range, as standard blade types will not fit these positions.