The Toyota Highlander Fuse protects against overcurrent by cutting off the electrical flow when a circuit draws more amperage than it is rated for to prevent damage to the radio, headlights, turn signals, or navigation unit. The Fuse is housed in a plastic box, usually placed under the hood or under the dashboard. The circuit is opened instantly by the melting of a thin metal strip within by excessive current. By enclosing the relays, moisture, vibration, and heat from the engine bay are prevented from hitting the smaller circuitry enclosed with them. Currently, the box opens by releasing the side clips, and a diagram shows how each circuit links to its own relay. This allows one to easily identify which unit has failed on any Toyota vehicle. Every Fuse is inexpensive and easy to replace; match the Fuse's amperage, size, and color (preferably Toyota Highlander high quality). There are blade designs that come in low profile mini, mini, regular, and maxi sizes, as well as glass tubes, giving the owner the right choices for Toyota Highlander circuits. When a Fuse blows, the Highlander component affected stops functioning, indicating that the Fuse needs to be replaced.
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