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1-1564520-1 / 1-1703639-1 Automotive 12-Pin Waterproof Connector — Urea Pump & New Energy Vehicle Socket
1-1564520-1 / 1-1703639-1 Automotive 12-Pin Waterproof Connector Urea Pump & New Energy Vehicle Socket
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1-1564520-1 / 1-1703639-1 Automotive 12-Pin Waterproof Connector — Urea Pump & New Energy Vehicle
The 1-1564520-1 (female socket) and 1-1703639-1 (male plug) are 12-pin waterproof automotive connectors from the TE Connectivity series, used in urea (DEF — Diesel Exhaust Fluid) pump assembly and new energy vehicle (NEV) wiring harness applications. These sealed connectors provide reliable moisture and chemical protection for wiring harness connections in SCR (Selective Catalytic Reduction) emissions systems and electric/hybrid vehicle powertrain circuits — two of the most demanding connector environments in modern automotive applications.
DEF is a 32.5% urea solution that is highly corrosive to standard copper terminals; the sealed housing and tin-plated terminals in this connector provide the chemical resistance required for long-term reliability in DEF pump applications. For NEV applications, the sealed design protects high-voltage adjacent low-voltage signal circuits from moisture ingress in battery pack and motor controller wiring harnesses.
Key Specifications
| Parameter | Value |
|---|---|
| Part Numbers | 1-1564520-1 (female) / 1-1703639-1 (male) |
| Manufacturer | TE Connectivity |
| Pin Count | 12-pin |
| Sealing | Waterproof (sealed housing + wire seals) |
| Application | Urea (DEF) pump / New Energy Vehicle (NEV) |
| Housing Material | PA66 glass-filled nylon |
| Terminal Material | Tin-plated copper alloy |
| Chemical Resistance | DEF (urea solution) resistant |
| Operating Temperature | -40°C to +125°C |
| Compliance | RoHS |
DEF Pump Connector — Why Chemical Resistance Matters
- DEF crystallization — when DEF dries, it leaves behind urea crystals that are abrasive and hygroscopic; crystal deposits in the connector absorb moisture and accelerate terminal corrosion
- Urea is corrosive to copper — urea solution attacks bare copper and standard tin plating over time; the sealed housing prevents DEF from reaching the terminals
- SCR system fault codes — DEF pump connector failure triggers P20EE (SCR NOx catalyst efficiency), P207F (reductant quality), and related DEF system DTCs that can derate engine power or trigger a countdown to engine shutdown in emissions-compliant markets
- 12-pin for complete pump interface — accommodates pump motor power/ground, heating element (prevents DEF freezing at -11°C), temperature sensor, level sensor, pressure sensor, and quality sensor circuits
Typical Applications
- Diesel vehicle DEF/AdBlue urea pump connector repair
- SCR emissions system wiring harness replacement
- New energy vehicle (BEV/HEV) powertrain connector repair
- Battery management system (BMS) wiring harness connector replacement
- Electric motor controller signal connector repair
Frequently Asked Questions
Q: What DTCs indicate a faulty DEF pump connector?
Common DTCs associated with DEF pump connector faults include: P20EE (SCR NOx catalyst efficiency below threshold), P207F (reductant quality performance), P204F (reductant system performance), P2BAD (reductant pump circuit low), and P2BAE (reductant pump circuit high). These codes can be caused by a faulty connector rather than a faulty pump or DEF quality issue — always inspect the connector for DEF crystallization and terminal corrosion before replacing the pump assembly.
Q: How do I clean DEF crystallization from a connector before replacing it?
Use warm distilled water to dissolve urea crystals — DEF is water-soluble and crystals dissolve easily. Do not use brake cleaner or solvent-based cleaners, which can damage the rubber wire seals. After cleaning, dry thoroughly with compressed air and inspect terminals for corrosion. If terminals show green or white corrosion, replace the connector — cleaning corroded terminals provides only a temporary fix.
Q: Can this connector be used for new energy vehicle (NEV) applications?
Yes — the 1-1564520-1/1-1703639-1 is used in both DEF pump and NEV wiring harness applications. For NEV use, the sealed design protects low-voltage signal circuits (BMS communication, temperature sensing, contactor control) from moisture ingress in battery pack and motor controller environments. Verify the terminal pitch and wire gauge compatibility with your specific NEV application before ordering.
