Most electrical equipment works with the ignition switch on. Regardless of the ignition switch, the following work: the control lamp for turning on the car anti-theft system, blocking the door locks, high beam alarm, brake signals, outdoor lighting, interior lighting and individual lighting, emergency alarm, horn and engine compartment lamp.
Most vehicle electrical power circuits are protected by fuses. The battery charge circuit, engine start circuit, generator circuit are not protected by fuses.
Before replacing a blown fuse, find out the cause of its blown and eliminate it. When looking for a malfunction, it is recommended to view the ones indicated in Table. 7-1 circuits that this fuse protects.
In table. Table 7-1 gives the purpose of each fuse, but some circuits may be missing on a particular car model (or devices), indicated in the table.
Table 7-1. Circuits protected by fuses
All diagrams in the section «electrical equipment» the color of the wires is indicated by letters, with the first letter being the color of the wire itself, and the second letter being the color of the strip on the wire (tab. 7-2).
Table 7-2. Wire color designation
Warning. When repairing a car and a car electrical system, it is imperative to disconnect the wire from the terminal «minus» battery.
When operating the car and when checking the electrical circuit of the car, it is not allowed to use fuses that are not provided for by the design of the car, and also to short the wires to ground (check the continuity of the circuits «spark»), as this can lead to burnout of the current-carrying tracks of the mounting block.
When removing relays and fuses in the mounting block, it is not allowed to use metal screwdrivers, as this leads to a short circuit of the relay outputs and burnout of the current-carrying tracks on the printed circuit boards of the mounting block.