Decoding of electrical circuits (BMW X3 E83)

Decoding the meaning of electrical circuit symbols

Symbol	Meaning
	Battery
	Circuit breaker
	Contact disk
	Connector (single)
	Connector (double)
	Diode
	Fuse
	Fuse element
	Fusible link
	Heating element
	Signal
	Shock sensor
	Diode
	Bulb
	Bulb
	Motor
	Resistor
	Sensor
	Solenoid valve
	Solenoid valve with diode
	Solenoid valve with resistor
	Solenoid valve with resistor and diode
	Switch (single)
	Switch (double)

Symbols used in vehicle electrical diagrams (dIN standard 40900)

Symbol	Meaning of the symbol
Connections
	Electric wire; intersection (with and without connection)
	Shielded wire
	Intersection lines (with and without connection)
	Node point, separate connection (if it is necessary to make a distinction)
	Plug connection; plug socket; electrical connector; three-way plug connection
	Ground connection (in the car)
Switches
	Snap action switch: normally open and normally closed contact
	Position switch: normally open contact and normally closed contact without automatic return
	Pole changeover switch: open before close and close before open
	A switch with a two-way closing contact and a central "off" position (for example, a turn signal switch)
	Switch with a set of normally open and normally closed contacts and a double-closing contact
	Multi-position switch
	Cam-operated switch, normally closed contact (for example, breaker contacts)
	Thermostatic switch: opening and starting device
Various components
	Single winding solenoid
	A solenoid with two windings acting in the same direction
	A solenoid with two windings acting in different directions
	Electrothermal actuator, electrothermal relay
	Electromagnetic actuator: reciprocating solenoid and electromagnetic (solenoidal) valve
	Relay (drive and switch)
	Resistor and potentiometer (with three connections)
	Thermistor, spark plug, igniter, heated glass
	Antenna
	Fuse box
	Permanent magnets
	Winding (inductive)
	Positive temperature coefficient resistor
	Negative temperature coefficient resistor
	Diode, current direction is in the direction of the arrow in the form of a triangle
	LED
	Hall EMF sensor
Device symbols
	Indicator measuring instrument: general, voltmeter, clock mechanism
	RPM indicator, temperature indicator, linear speed indicator
	Battery
	Plug socket
	Light source, headlight
	Horn sound signal
	Pressure sensor
	Relay
	Injector valve (nozzle), cold start valve
	Throttle switch
	Rotary type actuating mechanism
	Speaker
	Piezoelectric sensor
	Resistance sensor
	Quantitative flow meter, fuel level sensor
	Speed Sensor (ABS)
	Lambda probe (oxygen sensor)
	Linear speed sensor
	Air mass flow meter
	Inductive sensor
	Instrument cluster (instrument panel)