Original Dongfeng GX Left SMJ Box assy 3724410-C6100

The SMJ Box enclosure uses OEM-specified ABS+PC composite material (impact strength: ≥18 kJ/m²) with reinforced edge ribs, resisting deformation from road vibration (10-600Hz frequency range) or minor impact during maintenance. The surface features anti-UV and anti-corrosion coating (per Dongfeng’s Q/DF standard), withstanding extreme temperatures (-40°C to 85°C) and preventing fading/brittleness after 5+ years of outdoor use. It meets IP67 waterproof/dustproof standards: the lid and base are sealed with a factory-molded nitrile rubber gasket (compression ratio: 35±5%), and cable entry ports use oil-resistant rubber grommets—blocking rainwater, road salt, and dust from entering internal circuits, a critical feature for under-vehicle or cab-side installation

The assembly comes with pre-installed OEM terminal blocks (14-18 positions, rated current: 12-25A per terminal) and blade fuse holders (3-5 positions, compatible with 5-20A Dongfeng OEM fuses), designed to centralize SMJ (Signal/Control) circuit connections as per the vehicle’s original wiring diagram. Terminals are made of tinned copper (plating thickness: ≥6μm) for low contact resistance (≤25mΩ) and anti-oxidation performance. Internal wires use OEM-spec PVC insulation (temperature rating: 105°C) and are secured with factory-labeled cable ties (marked with "Signal In," "Power Out," etc., per Dongfeng’s color code), ensuring error-free maintenance and avoiding circuit misconnection. The detachable lid (secured by 4 OEM Phillips screws) allows quick access to internal components without damaging the enclosure

To ensure signal stability, the box integrates a factory-installed tinned copper shielding layer (coverage rate: ≥92%) around signal circuit terminals, reducing electromagnetic interference (EMI) from nearby high-current components (e.g., alternators, starter motors)—critical for accurate transmission of SMJ control signals (voltage fluctuation ≤±0.15V). At mounting points, it uses 1.0±0.2mm thick EPDM rubber pads (OE part no.: 3724410-C6100-PAD) that absorb vibration, preventing terminal loosening or wire fatigue over 300,000+ km of driving. The internal fuse holder also features a vibration-damping clip, avoiding fuse disconnection due to road shocks

The assembly adopts the factory’s original bolt-fixed design: it aligns with the vehicle’s pre-drilled mounting holes via 2 OEM positioning pins, then secures to the bracket with 4 M6×16 stainless steel OEM bolts (with medium-strength thread locker, per Dongfeng’s assembly standard). No specialized tools are needed—installation takes 12-18 minutes with a standard 8mm wrench, 40% faster than aftermarket alternatives. The box is marked with a factory "LEFT" direction label and alignment notches, preventing reverse installation. Post-installation, it maintains the original component clearance (≥15mm from adjacent parts) to avoid interference during vehicle operation