2-Pin Electric Brake Caliper / Fuel Injector / Ignition Wire Harness Connector – Type A & B Female OEM

This 2-pin female connector is a multi-application connector used in electric parking brake (EPB) caliper, fuel injector, and ignition coil harnesses. Available in Type A and Type B housing configurations to match different OEM harness designs. The 2-pin configuration carries actuator power and control circuits for these three distinct but electrically similar applications. Available bare or with 15cm pre-wired leads.

Key Specifications

• Pin count: 2-pin
• Gender: Female
• Housing types: Type A / Type B
• Housing material: High-temp nylon (PA66)
• Available as: Bare connector or 15cm pre-wired leads
• Application: Electric parking brake caliper, fuel injector, ignition coil harness

Three Applications, One Connector Family

The 2-pin connector serves three mechanically different but electrically similar applications — all require a 2-pin connector carrying motor/solenoid power and a switched ground or control signal:

1. Electric Parking Brake (EPB) Caliper

• Pin 1 (MTR+): EPB motor positive (12V supply)
• Pin 2 (MTR−): EPB motor negative (ECU-controlled ground)
• Location: Rear brake caliper, wheel arch — exposed to brake dust, heat, and road spray
• Fault codes: C-codes for EPB motor circuit faults, EPB warning light, inability to apply or release parking brake
• Common failure: Connector corrosion from road spray and brake dust contamination in the wheel arch environment

2. Fuel Injector

• Pin 1 (B+): Injector solenoid power (+12V)
• Pin 2 (INJ): ECU-controlled ground (injector pulse width modulation)
• Fault codes: P0201–P0208 (injector circuit faults, cylinder-specific)
• Common failure: Connector corrosion from oil contamination and underhood heat cycling

3. Ignition Coil

• Pin 1 (B+): Coil primary power supply (+12V)
• Pin 2 (IGT): Ignition trigger signal from ECU
• Fault codes: P0351–P0356 (ignition coil A–F primary/secondary circuit), P0300 (random misfire)
• Common failure: Connector corrosion from oil contamination on valve cover-mounted coil packs

Type A vs. Type B – How to Identify

Type A and Type B use different housing geometries (locking tab position, cavity arrangement). To identify your type:

• Check the locking tab position — Type A has the tab on the top face; Type B has the tab on the side
• Compare the housing profile to your original OEM connector
• Check the OEM part number stamped on your existing connector housing

Frequently Asked Questions

Q: My EPB warning light is on but the parking brake still works — is this the connector?
A: Yes. A partially corroded EPB connector (high resistance rather than open circuit) can cause the EPB ECU to detect a circuit fault and illuminate the warning light, while the motor still has enough current to operate. Replace the connector to resolve intermittent EPB warning lights.

Q: Can I use the same connector for both EPB and fuel injector applications?
A: The connector housing is physically identical for both applications. However, the wire gauge and terminal rating may differ — EPB motors draw higher current (up to 15A) than fuel injectors (up to 2A). Verify the terminal current rating matches your application before installation.

Q: What vehicles use 2-pin EPB caliper connectors?
A: 2-pin EPB caliper connectors are used on Audi A4/A5/A6/Q5/Q7, VW Passat/Touareg, BMW 3/5 Series, Mercedes C/E-Class, and most modern vehicles with integrated EPB rear calipers. Cross-reference your vehicle’s wiring diagram to confirm the connector type.