Automotive body control wiring harness

The automotive body control wiring harness is an important component of the vehicle's low-voltage wiring harness. It is mainly used to connect the body control module (BCM) with various sensors and actuators, achieving centralized management and intelligent operation of body functions.

The automotive body control wiring harness is an important component of the vehicle's low-voltage wiring harness. It is mainly used to connect the body control module (BCM) with various sensors and actuators, achieving centralized management and intelligent operation of body functions. The following are the main classifications of body control wiring harnesses and their specific functions:

 

1.Lighting system wiring harness

Function: Control the lighting equipment both inside and outside the vehicle to ensure driving safety and signal transmission.

Composition and Function:

◎. Headlamp wiring harness: Connects the headlights (high and low beam lights, daytime running lights) and turn signals, supporting automatic on/off and brightness adjustment.

◎. Taillight/brake light harness: Transmits brake signals, controls width indicator lights and reverse lights.

◎. Interior lighting wiring harness: Control of ceiling lights, reading lights and ambient lights, supporting automatic lighting when the door is opened or manual adjustment.

◎. Intelligent function wiring harness: automatic headlights (activated based on light sensing), adaptive high beams (AFS), etc.

 

2. Door lock and window control wiring harness

Function: Manage car door locking, window lifting and lowering, and rearview mirror adjustment.

Composition and Function:

◎. Central control lock wiring harness: Connects to the car door lock motor to enable one-click locking/unlocking of the car with a remote key or in-car buttons.

◎. Power window wiring harness: Drives the window motor and supports anti-pinch function (through current detection or sensor feedback).

◎. Rearview mirror adjustment/folding wiring harness: Controls the Angle adjustment, heating and electric folding of the rearview mirror (such as automatic folding in rainy days).

 

3. Wiper and washing System Wiring harness

Function: Ensure the windshield is clean and enhance the driving field of vision.

Composition and Function:

◎. Wiper motor wiring harness: Drives the movement of the wiper arm and supports multi-speed regulation (low speed, high speed, intermittent mode).

◎. Spray pump wiring harness: Controls the spraying of windshield washer fluid and is often linked with the wiper (such as automatically sensing rainfall to start).

◎. Intelligent function wiring harness: Rain sensor (automatically adjusts the wiper frequency through optical or capacitive sensing).

 

4. Seats and Comfort Wiring Harnesses

Function: Enhance the comfort and convenience of driving and riding.

Composition and Function:

◎. Electric seat adjustment wiring harness: Drives the seat motor to achieve forward and backward, height, and backrest Angle adjustment (including memory function).

◎. Seat heating/ventilation wiring harness: Connect the heating wire or fan module and control it through the feedback of the temperature sensor.

◎. Steering wheel heating harness: Provides heating function during winter driving (high-temperature resistant wires are required).

 

5. Safety System Wiring Harness

Function: Ensure the passive and active safety of vehicles.

Composition and Function:

◎. Airbag (SRS) wiring harness: Connects the collision sensor and the airbag ignition device to ensure timely triggering in case of an accident.

◎. Tire Pressure Monitoring (TPMS) harness: Transmits data from the tire pressure sensor to the dashboard to alert for abnormal tire pressure.

◎. Anti-theft alarm wiring harness: Connect the door contact switch and vibration sensor to trigger audible and visual alarms.

 

6. Air Conditioning and Air Circulation Wiring harnesses

Function: Regulate the temperature and air quality inside the vehicle.

Composition and Function:

◎. Air conditioning compressor wiring harness: Controls the start and stop of the compressor (for fuel vehicles) or electric compressors (for new energy vehicles).

◎. Damper motor wiring harness: Adjust the air direction at the air outlet (such as switching between face blowing and foot blowing modes).

◎.PM2.5 sensor wiring harness: Monitors air quality and automatically switches between internal and external circulation.

 

7. Information Interaction and Network Communication Wiring Harnesses

Function: Support data interaction and remote control of on-board electronic systems.

Composition and Function:

◎.CAN/LIN bus harness: Connects the body control module (BCM), instrument panel, central control screen, etc., to achieve signal sharing (such as door status display).

◎. Bluetooth/Antenna harness: Supports signal reception for car phones and radios.

◎.USB/ Charging interface cable harness: Power mobile devices and transfer data (such as CarPlay connection).

 

8. Vehicle body sensor Wiring harness

Function: Collect vehicle body status information and support intelligent control.

Composition and Function:

◎.Light sensor wiring harness: Automatically adjust the brightness of headlights or interior ambient lights.

◎.Acceleration/tilt sensor wiring harness: Used for slope assistance and automatic parking functions.

◎.Ultrasonic radar wiring harness: Connected to parking radar to achieve obstacle distance alarm.

 

Design features of the vehicle body control wiring harness

1. Modular design: It adopts plug-in connectors for easy and quick maintenance and replacement (such as door wiring harness assemblies).

2. Environmental adaptability: The engine compartment wiring harness needs to be heat-resistant (with silicone sheath), and the door wiring harness needs to be bent-resistant (made of TPE material).

3. Anti-interference capability: Key signal lines (such as CAN bus) use twisted-pair cables or shielding layers to prevent electromagnetic interference.

4. Lightweight: Use thin-walled wires or aluminum wires to reduce the weight of the vehicle body (this is particularly important for new energy vehicles).

 

Typical case

Tesla Model 3: All vehicle door locks, lights and Windows are managed through the centralized Body Controller (BCM), and the length of the wiring harness is significantly reduced.

Volkswagen ID.4: It adopts an Ethernet backbone network, and the body control wiring harness supports OTA upgrades and intelligent lighting interaction.

 

Summary

The body control wiring harness is the underlying support for a vehicle's "intelligence", and its functions cover multiple dimensions such as safety, comfort, and interaction. As automotive electronic architectures evolve towards Domain Control and Central Computing, body wiring harnesses will be further simplified, but their core role - precisely transmitting signals and power - remains indispensable.