Q: How to locate, identify, and replace fuses, circuit breakers, and fusible links on 2002 through 2006 Toyota Avalon?
A: The vehicle's electrical circuits are protected by a combination of fuses, circuit breakers, and fusible links. The fuse blocks can be found under the instrument panel and in the engine compartment, depending on the model year of the vehicle. The interior fuse box is located on the dashboard, to the left of the steering column. In some models, such as the Camry, 2004 and later Solera, and Lexus ES330, the engine compartment fuses are in the main fuse/relay box at the left front fender. Additional fuses may be present in smaller boxes near the radiator or in the relay box at the right fender area for certain models like the Solara and Avalon. Each fuse is designed to protect a specific circuit, and the fuse panel cover identifies the various circuits. Miniaturized fuses with blade terminal design are used, allowing easy removal and replacement. It is recommended to check the fuse first if an electrical component fails, using a test light to check for power at the exposed terminal tips. If power is present on one side of the fuse but not the other, the fuse is blown. Blown fuses should be replaced with the correct type, as fuses of different ratings are physically interchangeable but only fuses of the proper rating should be used. If a replacement fuse immediately fails, the cause of the problem, such as a short circuit in the wiring, should be isolated and corrected before replacing the fuse again. Fusible links are used in circuits that are not ordinarily fused, such as the ignition circuit or those carrying high current. Cartridge-type fusible links, similar to large fuses, can be found in the engine compartment fusible link box. To replace a fusible link, the negative battery cable should be disconnected, and the link can be unplugged and replaced with one of the same amperage.