OBD II Wire Harness

As the global automotive industry advances toward smarter, safer, and more environmentally responsible vehicles, the need for reliable diagnostic infrastructure becomes critical. At the heart of this evolution lies the OBD II wire harness—a vital component connecting electronic control units (ECUs) to diagnostic tools, enabling accurate fault detection and real-time vehicle monitoring. With stricter emission standards and increasing demand for connected vehicle data, OEMs and aftermarket service providers are investing heavily in robust and customizable OBD II harness solutions.

What Is an OBD II Wire Harness?

An OBD II wire harness is a pre-assembled set of wires, terminals, and connectors designed to facilitate communication between the vehicle’s OBD II port and its internal control systems. Built according to industry standards (typically with a 16-pin J1962 connector), these harnesses enable:

• Transmission of diagnostic data and DTCs (Diagnostic Trouble Codes)

• Power and ground connectivity

• Signal integrity for real-time monitoring

It serves as the critical interface for automotive diagnostics, whether during manufacturing, regular servicing, or emissions testing.

3. Application Scenarios Across Automotive Sectors

• Automotive Manufacturing: On assembly lines, OBD II diagnostic harnesses are used for rapid quality control and system checks before vehicles leave the factory.
• After-Sales Services and Repair Shops: Independent repair shops and service chains use universal or customized OBD II harnesses to connect testing equipment to various vehicle models.
• Fleet Management and Telematics: Telematics providers embed OBD II-compatible harnesses into GPS trackers and IoT modules to collect real-time data on vehicle fuel efficiency, driving behavior, and engine status.
• Emission Control Compliance: Government testing stations and environmental protection agencies use diagnostic harnesses to conduct emissions testing and compliance checks.

4. Why Choose Kaweei’s Custom OBD II Wire Harnesses?

Kaweei specializes in customized wire harness manufacturing tailored to meet the technical and regulatory demands of global B2B clients. Compared with off-the-shelf harnesses, our custom solutions offer:

✅ Vehicle-Specific Customization: Match unique pin-outs, connector styles, and lengths for OEMs or specific car models

✅ Superior Materials: High-temperature, oil-resistant, or low-voltage-drop wires based on your working conditions

✅ Protocol Compatibility: Support for CAN, K-Line, ISO 9141, J1850, and more

✅ Rigorous Quality Control: 100% continuity testing, pull testing, and insulation resistance verification

✅ Flexible Production Volumes: Ideal for both pilot runs and mass production

5. Frequently Asked Questions (FAQ)

Q1: Can the OBD II wire harness be customized for specific diagnostic protocols?

A: Yes, Kaweei supports harness customization for protocols including CAN-BUS, ISO 14230 (KWP2000), and more.

Q2: What materials are used in Kaweei’s OBD II harnesses?

A: We use UL-certified PVC, XLPE, or TPE insulation, with tin-plated copper conductors to ensure long-term performance and flexibility.

Q3: Do your harnesses support telematics device integration?

A: Absolutely. Our OBD II harnesses can include power output wires for GPS trackers or telematics modules, with fuse and overcurrent protection.

Q4: What’s the MOQ for custom OBD II harness orders?

A: We support small-batch prototyping starting from 100 pcs, with scalable options for mass production.

Q5: Are your harnesses compliant with international standards?

A: Yes, all harnesses meet ISO, RoHS, and REACH compliance, and we can provide IATF 16949-compliant manufacturing upon request.