The electrical circuits of the vehicle are protected by fuses, circuit breakers and fusible links The main fuse/relay panel is located in the engine compartment and the secondary relay panel is located in the left-front side of the car ahead of the horn. The fuse/relay box is called the Totally Integrated Power Module (TIPM) and each of the fuses shown in the fuse panel corresponds to a particular circuit. Small, medium and large fuses are employed in the fuse blocks and all are equipped with the same blade terminal; the medium and large fuses can be pulled out by hand while the small ones need pliers or a plastic fuse-puller tool. If there is an open circuit, or an electrical component fails, one should always check the fuse first and it is recommended that one should use a testlight to test the exposed terminal tips on the fuse; if the light comes on at one end and not the other then the fuse is blown; the fuse can also be inspected visually. Some of the fuses are not energized with the key in the Off position and thus the key should be placed in the On position before voltage can be checked. Blown fuses have to be replaced with similar fuses because while physically, the fuses may be interchangeable they should be of the right rating as they are meant to protect circuits of specific ratings. If for some reason a new fuse blows out as soon as it is installed, or is switched with a higher amp fuse, it will continue to blow every time until the true problem, almost always a short circuit or a faulty internal component, is dealt with. Some of the most frequent causes of electrical failures include rubbing on wires harness with metal part or with hot exhaust. In these models, the fuses of high current and high amperages are used and these fuses are situated in the underhood fuse/relay box.