28Pin Female Blue Car Aftermarket Stereo Audio Connector 4-2188225-8 – Reliable OEM-Style Harness Adapter for Vehicle Audio Upgrades

The TS30243-28P-21-4 is a 28-position female blue automotive electrical connector designed to enable fast, safe, and reversible integration of aftermarket head units into factory wiring systems. Functioning as the female receptacle that pairs with the male plug TS30243-28P-11-4, this connector eliminates the need to cut or solder original vehicle harnesses during stereo installations. The blue housing provides a clear visual distinction, allowing for quick identification among multiple connectors under the dashboard. This model is frequently used in audio interface kits for Toyota, Lexus, and other Japanese-manufactured vehicles that utilize a standardized 28-pin blue-coded connector for factory audio and control signal routing.

Ideal for both professional installers and home mechanics, the TS30243-28P-21-4 supports full electrical continuity across all critical circuits, including left and right speaker outputs, power supply, ground, illumination, and steering wheel control inputs. Its secure fit and durable construction ensure a stable connection that resists vibration and environmental stress, making it suitable for use in passenger cars, marine vessels, UTVs, and recreational vehicles. By maintaining the integrity of the original harness, this adapter allows for easy restoration or future upgrades, offering a clean, non-invasive method to modernize vehicle audio without compromising factory wiring.

Product Specifications

• Model Number: TS30243-28P-21-4

• Alternative Part No.: 4-2188225-8

• Connector Type: Female

• Number of Pins: 28

• Housing Color: Blue

• Mating Plug: TS30243-28P-11-4 (Male)

• Housing Material: PBT+GF15% or PA66+GF30%

• Terminal Material: Copper Alloy / Brass / Phosphor Bronze

• Primary Use: Aftermarket Stereo Integration

• Compliance Standards: IATF 16949, ISO14001, RoHS

• Quality Check: 100% Inspected Before Shipment

• Minimum Order: 1,000 pcs

• Delivery Time: 2–15 Days

Blue Housing for Clear Circuit Identification

The blue housing of the TS30243-28P-21-4 serves as a color-coded identifier, making it easy to distinguish from red, green, or black connectors in complex wiring setups. This feature is especially valuable during stereo upgrades where multiple harnesses are present, reducing the risk of incorrect connections and saving installation time. In OEM vehicle designs, blue connectors are often assigned to specific audio or control modules, ensuring compatibility with factory systems that require a blue-coded female interface. This model is engineered to meet exact dimensional and electrical specifications for reliable mating and long-term performance.

Robust Design for Harsh Operating Conditions

Manufactured using high-performance thermoplastics—PBT+GF15% or PA66+GF30%—this connector delivers excellent resistance to heat, impact, and chemical exposure. These materials maintain structural integrity across a wide temperature range (-40°C to +120°C), preventing deformation or cracking due to thermal cycling. The internal Terminals are crafted from copper alloy, brass, or phosphor bronze, ensuring low electrical resistance, high conductivity, and long-term corrosion resistance. This construction makes the connector suitable for use in demanding environments such as marine yachts, off-road vehicles, and high-mileage passenger cars where durability and reliability are critical.

Customization and OEM/ODM Support

We provide full OEM and ODM services for companies developing branded audio solutions or specialized harness systems. From mold development and material selection to packaging and labeling, our team supports every stage of product creation. Whether you need a modified pin layout, different housing color, or a completely new connector design, we offer rapid prototyping, scalable manufacturing, and strict quality control to deliver custom solutions that meet your technical and market requirements.

Quality and Compliance Assurance

All connectors are produced under strict quality management systems compliant with IATF 16949 (automotive), ISO14001 (environmental), and RoHS (hazardous substances). Each unit undergoes 100% inspection prior to dispatch to verify terminal alignment, housing color, mechanical strength, and mating compatibility. This ensures consistent performance and reliability for every customer, whether ordering samples or large-volume production runs.

Need Help Matching Your Vehicle?

Unsure if this connector fits your car or stereo system? Compare it with reference images or send us a photo of your factory harness. Our technical support team will quickly confirm compatibility. Can't find the right part? Contact us at mandy@tscn.com.cn—we specialize in sourcing and manufacturing custom connectors for unique vehicle platforms and industrial applications.

About TSCN – Automotive Connector Manufacturer

Zhejiang Tongsheng Electronic Co., Ltd. (TSCN) is a leading manufacturer of high-quality automotive electrical components with over 25 years of experience. We specialize in precision connectors for audio systems, control modules, marine electronics, and specialty vehicles. Our products are trusted by distributors and installers worldwide for their durability, accuracy, and compatibility with OEM standards.

Get a Quote or Request Samples

For technical drawings, pinout diagrams, sample units, or bulk pricing, please contact our sales team at mandy@tscn.com.cn. We offer fast turnaround and expert support to help you source the right components for your automotive audio projects.