Some of the electrical accessories in the vehicle include the fuel injection system; horns; starter; and fog lamps Relays are used to transfer electrical signals to the parts by using a low current control circuit to handle a high current power circuit. A bad relay will cause a related component not to work correctly and a majority of them are placed in the engine compartment and interior fuse or relay boxes. If there is an indication of a faulty relay, it may be pulled and checked possibly from a certain procedure or from a specialist. Power circuits of most relays in these kinds of vehicles are ISO relays that can be easily distinguished by the presence of numbers on the terminals showing their Ci/Co/ai positions and roles, optimizing the layouts of which come in two main types of terminal planning. The control circuit is used to connect to the relay coil as the other terminals are in the power circuit where the power is energized by creating the magnetic field as made by the coil. Usually terminals 85 and 86 are for the control circuit and provided thereof since the configurations for the diode or resistor may require additional connection. Terminal 30 is the connection point to the battery positive terminal and terminal of 87 connects to the ground end of the circuit. For checking relay, ohmmeter can be used to measure the continuity through the control coil and should show proper resistance values and characteristics with respect to the presence of resistor or diode. Furthermore, continuity should be examined concerning the power circuit terminals when the relay is at a standby state, and with the energizing of the relay, continuity should be determined as to pin number 30 and 87. If any tests reveal a failure, the relay should be replaced.
