BMW / Mercedes-Benz 2-Pin Hybrid High-Voltage Connector – OEM 1355328-1 | Female (Bare or 10cm Pre-Wired)

The OEM 1355328-1 is a specialized 2-pin female connector used in BMW and Mercedes-Benz hybrid vehicle high-voltage (HV) system harnesses. Unlike standard 12V automotive connectors, hybrid HV connectors must meet stringent safety and insulation requirements for circuits operating at 200–400V DC. The orange housing color is the international standard (ISO 6469-3) for high-voltage automotive circuits. Available bare or with 10cm pre-wired leads.

Key Specifications

• OEM Part Number: 1355328-1
• Pin count: 2-pin
• Gender: Female
• Housing color: Orange (ISO 6469-3 HV circuit identification standard)
• Housing material: High-voltage rated nylon with enhanced insulation
• Operating voltage: 200–400V DC (hybrid HV system)
• Available as: Bare connector or 10cm pre-wired leads
• Application: HV battery management, HV junction box, hybrid motor control harness

Why Orange? – ISO 6469-3 HV Color Coding

The orange housing is not a brand choice — it is mandated by ISO 6469-3 (Safety requirements for electric propulsion systems), the international standard for electric and hybrid vehicle safety. Orange identifies all high-voltage components and wiring in a hybrid or electric vehicle, including connectors, cables, and junction boxes. This color coding allows emergency responders and technicians to immediately identify HV circuits and avoid accidental contact. Never use orange connectors for 12V circuits, and never substitute a non-orange connector for an HV application.

HV System De-Energization Procedure (BMW / Mercedes-Benz)

1. Switch off the ignition and remove the key
2. Disconnect the 12V auxiliary battery (negative terminal first)
3. Locate and remove the HV service disconnect plug (orange plug, typically in the boot/trunk or under the rear seat)
4. Wait a minimum of 5 minutes for HV capacitors to discharge (some BMW/Mercedes systems require up to 10 minutes)
5. Verify HV system is de-energized using a CAT III rated multimeter (1000V rating minimum) before touching any HV connector
6. Wear insulated gloves (IEC 60903 Class 0, rated 1000V) throughout the procedure

Common HV Connector Fault Symptoms

• HV system warning light / hybrid system fault warning
• Reduced EV range or hybrid system not engaging
• HV battery isolation fault (insulation resistance below threshold)
• Intermittent HV system shutdown under load
• BMW iDrive / Mercedes COMAND displaying “Hybrid system fault” or “Drive carefully”

Frequently Asked Questions

Q: What BMW and Mercedes-Benz hybrid models use OEM 1355328-1?
A: Cross-reference OEM 1355328-1 with your vehicle’s wiring diagram to confirm fitment. This connector is used in BMW ActiveHybrid (3, 5, 7 series) and Mercedes-Benz hybrid model HV harnesses. Always verify against the vehicle-specific wiring diagram before ordering.

Q: Can I install this connector myself?
A: No. HV hybrid system connectors must only be serviced by qualified technicians with HV safety training and appropriate PPE. The HV battery must be de-energized via the service disconnect plug before any work on HV circuits. Attempting HV connector work without proper training and equipment is extremely dangerous.

Q: What is the difference between the HV system and the 12V system in a hybrid vehicle?
A: Hybrid vehicles have two separate electrical systems: the 12V auxiliary system (standard automotive electrical, powers lights, infotainment, ECUs) and the HV traction system (200–400V DC, powers the electric motor and is charged by the HV battery). The OEM 1355328-1 is part of the HV traction system. The two systems are electrically isolated from each other and from the vehicle chassis.

Q: Are terminals included?
A: Yes, terminals are included with all variants.