Understanding Automotive Wire: Types and Selection Guide
In today’s automotive industry, vehicles are no longer just mechanical machines; they are sophisticated electronic systems that rely heavily on high-quality wiring. From advanced driver-assistance systems (ADAS) to electric vehicles (EVs), every function depends on the proper transmission of electrical signals. Knowing about different types of automotive wires and choosing the right ones is very important for safety and performance.
This guide will help you understand the basics of automotive wire harness, explain common types of automotive wires, and give you useful tips for picking the best wiring for your needs.
Importance of Automotive Wires and Harnesses
Automotive wires are specialized electrical conductors used in vehicles to transmit power and signals between components. These wires are more than just conduits for electricity. They play a critical role in the operation of all vehicle systems, from lighting and infotainment to engine management and high-voltage EV components.
An automotive wire harness is a bundled assembly of multiple wires with connectors and protective covering. A well-designed automotive wire harness ensures that power and signals are transmitted efficiently and safely. As cars become more complex, especially with hybrid and electric models, it’s crucial to choose the right type of wire, insulation material, and connectors.
Common Automotive Wire Types
Automotive wires can be classified based on insulation type, structure, and application. Below is an overview of the most common types:
| Standard | Type | Full name | Description | Rated Temp. | Applications |
|---|---|---|---|---|---|
| Japanese (JASO/JIS) | AVSS | Japanese Thin Insulated Low-Voltage Wire | Thin, flexible, space-saving. | 105°C | Interior lighting, dashboard. |
| Japanese (JASO/JIS) | AESSX | Thin Cross-Linked Polyethylene... | Reinforced for high-temp. | 125°C | Sensors, electronic circuits. |
| US (SAE) | TXL / XLPE | Thin Cross-Linked Polyethylene Wire | Lightweight, oil-resistant. | 125°C | ECU, engine bay wiring. |
| German (DIN) | FLRY-A/B | European Standard Wires | IATF 16949 standards compliant. | 105°C | European vehicles, CAN lines. |
The choice of wire depends on the customer’s required temperature rating. Currently, JIS- and DIN-standard wires are the most commonly used in the domestic market.
Classification by Structure
- Single-Core Unshielded: Generally used for low current and signal transmission.
- Single-Core Shielded: Reduces EMI for sensitive electronic signals.
- Multi-Core Twisted Pair: Enhances EMI/RFI resistance for ADAS modules.
- High-Voltage Wires: Rated for 600–1500V, typically using XLPE insulation.
How to Choose Automotive Wires
Considerations when designing or sourcing a wire harness
1. Key Electrical Specifications
- Current-Carrying Capacity
- Voltage Rating
- Insulation Type
2. Environmental Conditions
- Temperature and Heat Resistance
- Oil, Water, and Salt Spray Resistance
- EMI/RFI Protection
Connector Considerations
- Contact Reliability (Gold/Tin plating)
- Reliability Testing (Vibration, Salt spray)
- Mechanical Strength & Sealing (IP67 or higher)
Wanshih is Your Trusted Manufacturer of Automotive Wires
For high-quality automotive wire harness solutions, Wanshih stands out as a trusted partner. Our professional, custom design capabilities are tailored for the latest EV and ADAS trends.
Success Stories
1. Digital Instrument Wire Harness for European EV Tier 1 Supplier
Challenge: Signal interference between HUD and battery module.
Wanshih Solution: 30 custom LVDS samples; supervised production and signal testing.
Outcome: Mass production in 8 months; over 300,000 sets shipped annually.
2. High-Voltage Power Wire for Taiwanese EV Manufacturer
Challenge: Facing production downtime due to original supplier failure.
Wanshih Solution: Completed 10 prototype units within 48 hours; custom high-current tooling.
Outcome: Sample to production within two weeks; extended to other module harnesses.
Partner With Wanshih to Get Your Automotive Wire Harnesses Right
Choosing the right automotive wire is critical for ensuring vehicle systems operate reliably and safely. Wanshih offers comprehensive solutions that address both traditional and emerging challenges. Please feel free to contact us for further information.
▲ Check out our automotive wire harness solutions introduction video!
Further reading: Automotive Module Cable: Basics and Applications