The electrical circuits of the engine control system are made according to a multi-wire circuit and are connected to «weight» car only through the electronic control unit. Consumers are powered by batteries (with the engine off) and generator (with the engine running).
A number of elements of the electrical circuit of cars Opel Astra J (ceiling lamps for interior lighting, door locks, power windows, rear window heater, windshield wipers, etc.) connected through electronic control units for electrical equipment of the passenger compartment and anti-theft alarm (GEM). These blocks allow you to create a delay in turning on and off electrical devices, as well as changing the duration of a pause in their work, depending on the selected control algorithm. In addition, in the event of an attempted unauthorized entry into the vehicle, the GEM unit issues an alarm using a siren installed under the hood.
A combination switch is used to switch the main circuits of the car (lock) ignition, consisting of a contact part and a mechanical anti-theft device with a lock.
Schemes of electrical equipment of the car are given in the relevant section of the site.
Warnings
Carry out any work on the vehicle's electrical equipment only with the battery disconnected.
Disconnect or connect the battery only when the ignition is off.
When checking the circuits of electrical equipment, it is forbidden to short to «mass» wires (check the continuity of the circuits «for a spark»), as this can lead to failure of electrical components.
It is forbidden to use fuses that are not provided for by the vehicle design or designed for a higher current, and also to use wire instead of fuses.
When replacing fuses, it is forbidden to use screwdrivers and metal tools - this can cause a short circuit in the circuits of electrical equipment.
It is forbidden to disconnect the battery while the engine is running; violation of this rule will cause failure of the voltage regulator and elements of the vehicle's electronic equipment.
In order to avoid failure of the diodes of the generator rectifier unit, it is forbidden to check them with a megohmmeter or a test lamp powered by a voltage of more than 12 V, and to check the electrical equipment circuits on the car with such devices without disconnecting the wires from the generator.
It is necessary to check the insulation resistance of the generator stator winding with increased voltage on the generator removed from the car, with the stator winding terminals disconnected from the rectifier unit.
When carrying out electric welding work on a car, it is necessary to disconnect the wires from the terminals of the battery and the generator, as well as the blocks with wires from the electronic engine control unit.
Do not touch the elements of the ignition system and high-voltage wires while the engine is running.
Do not run low voltage wires in the same bundle as high voltage wires.
Regularly clean the battery terminals and cable lugs from oxides and dirt.
When recharging the battery with a charger, disconnect the wires from the battery terminals.
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