6 common wiring harnesses in cars

1. Engine harness: a collection of wires connecting various engine components and systems,

 responsible for transmitting power and signals, connecting engine control units, sensors, actuators, etc.

2. Body harness: a collection of wires connecting various body components and systems, 

responsible for transmitting power and signals, connecting lights, dashboards, air conditioning systems, audio systems, etc.

3. Instrument harness: a collection of wires connecting the dashboard and the driver's control panel, 

responsible for transmitting various indicator lights, instruments and control signals on the dashboard.

4. Light harness: a collection of wires connecting the vehicle's lighting system, 

responsible for transmitting power and signals, connecting headlights, taillights, turn signals, etc.

5. Front and rear windshield harness: a collection of wires connecting electronic equipment 

and sensors on the front and rear windshields, responsible for transmitting power and signals, connecting wipers, rain and light sensors, etc.

6. Seat harness: a collection of wires connecting electronic equipment and sensors on the seats, 

responsible for transmitting power and signals, connecting seat heating, ventilation, massage and other functions.

These wiring harnesses play a key role in the car, responsible for transmitting power and signals, 

connecting various components and systems, and ensuring the normal operation and function of the car. 

They are usually designed and manufactured according to the requirements of automobile manufacturers 

and relevant standards, and need to undergo rigorous testing and verification to ensure their reliability and safety.