Many of the accessories on your Toyota receive their power via small plastic fuses that simply plug into the fuse box under your hood. In extreme situations, such as the failure of many or all fuse-controlled functions, the fuse box itself may go bad and require replacement. You must remove the old fuse box before installing the new one. Removal of your old fuse box will only take approximately 20 minutes.
Open your Toyota vehicle's hood, and remove the both the negative and positive battery cables with an open-end wrench. The negative battery cable will be black and marked with a minus (-) sign on the battery base; the positive cable will be red and marked with a plus (+) sign.
Locate the fuse box under the hood. The exact location will depend on the model and year of your Toyota vehicle; see your owner's manual. However, the fuse box will always be mounted right next to or extremely close to the battery on all Toyota makes.
Remove the retaining bolts that hold the fuse box in place using your open-end wrench. Most Toyota models have three retaining bolts, although some models will have four. Look for these bolts on the side and bottom of the box.
Find the two wires that run from your negative and positive battery cables and connect to the fuse box, and trace them to the base of the fuse box. Snip these wires with wire strippers.
Remove the fuse box by hand, lifting it out of the engine compartment.