Car electrical system diagram
Battery
* Provides power to all vehicle electrical components.
Starter
* Drives the engine when starting.
Generator
* Charges the battery while the engine is running.
Voltage regulator
* Monitors generator output voltage to protect battery and other components from overvoltage.
Dispensing board
* Distributes battery power to various systems.
Fuses and relays
* Protect electrical circuits from overload and short circuits.
* Relays turn various systems on and off at the command of switches or sensors.
Electrical harness
* Wire package connecting all electrical components.
Ignition system
* Creates an electric spark to ignite the air-fuel mixture in the cylinders.
* Includes ignition coil, spark plugs and Electronic Engine Control Module (ECM).
Lighting system
* Provides visibility at night and in poor visibility conditions.
*Includes headlights, taillights, turn signals and brake lights.
Engine Management System (ECM)
* Controls engine operation to optimize performance and fuel economy.
* Contains sensors that monitor various engine parameters and solenoids that regulate fuel delivery, ignition and other functions.
Transmission Control System (TCM)
* Controls the operation of the gearbox to ensure smooth gear shifting.
Body Control System (BCM)
* Controls vehicle comfort and safety, including power windows, door locks and climate controls.
Passive Restraint System (SRS)
* Provides occupant protection in the event of an accident, including airbags and seat belts.
Audio system
* Provides entertainment and information.
* May include a radio, CD player or digital music player.
Climate control system
* Maintains a comfortable temperature inside the car.
*May include air conditioning, heater and fans.