Fuses can be found at the central fusebox in the engine compartment on the passenger's side, in the fusebox for the passenger cabin found under a panel on the right-hand end of the facia for RHO models and the left side of the luggage compartment. If a fuse blows, the electrical circuits the fuse protects will cease to function with specific fuse positions and protected circuits depending on the vehicle specification, model year and country. To remove a fuse, turn off the ignition, remove the cover on the central fusebox and use the plastic removal tool provided to remove the fuse; if the blown fuse has a broken or melted wire within it. Always replace a fuse with a similarly rated one to avoid fire hazards and constant blowing is an indication that there is a fault in the protected circuit. Blown fuses may also be caused by short-circuits from wiring, so look for trapped or frayed wires, as well as damaged connectors. Only blade type fuses should be replaced by DIY mechanics whilst blown large fusible links indicate serious electrical faults and need to be professionally diagnosed. Relays are used as electrically-operated switches and provide for remote switching of heavy currents, multiple control inputs, and timer functions. If a circuit has a relay in it and it fails, the relay could be at fault: one basic test is if there's a click when an item is switched on. Most relays have four or five terminals for current supply and output and testing should ensure all connections are supplying expected voltage. Substitution with a known good relay is the ultimate test, but caution is needed as similar looking relays may not be identical. Relays are found in the central and main fuseboxes, and at the luggage compartment fusebox and to remove a relay, make sure the ignition was off before pulling out the relay from its socket and pushing in the new relay firmly to refit.