In the vehicle, most of the electrical facilities that include the fuel injection system,
Horns, starter, and the fog lamps use relays to switch the signals electrically to the components. Relays utilize a low current path, usually referred to as the control circuit to open or close a high current path which is the power circuit. Any issues in this part of the relay will have an impact on the proper functioning of the associated component. The majority of relays can be usually found in the engine compartment, basically all over the car, in fuse and relay containers in the interior.