Description
Complete front seat harness for Driver and Passenger for Peugeot 407. Attention: Without relays.
High-quality replacement wiring harness designed for the front seats of the Peugeot 407. This harness routes power and signals between the vehicle body and seat-mounted devices such as electric seat motors, seat heater elements, occupancy/weight sensors, side airbag connectors and seatbelt buckle switches (when fitted). Supplied as a direct-fit harness with original connector interfaces and mounting points, it is ideal for automechanics and experienced DIYers looking to restore seat functions after wire breakage, connector damage or water ingress. Common search terms: Peugeot 407 seat harness, seat wiring loom, OE 9649424580, front seat wiring harness.
Technical Information
- Manufacturer: Peugeot (Stellantis)
- Model: Peugeot 407
- Product Codes: 9649424580
- Additional Numbers: NFP
Compatibility
Fits Peugeot 407 models equipped with front seat electrical/airbag connections that match OE code 9649424580. Always verify connector shapes and mounting points against the vehicle harness before installation.
Function And Typical Applications
The front seat harness carries electrical supply and signal lines for:
- Seat position motors (fore/aft, recline, lumbar where fitted)
- Seat heating elements (if the vehicle is equipped)
- Occupant detection/weight sensors for airbag management
- Side airbag and seatbelt pretensioner connectors
- Buckle/release switches and other seat-mounted switches
How Replacement Is Performed
Typical replacement steps (for experienced technicians or competent DIYers):
- Disconnect the negative battery terminal and wait a few minutes to ensure system discharge.
- Move the seat to access mounting bolts and electrical connectors.
- Unbolt the seat from the floor and carefully tilt to expose the underside wiring connectors.
- Release wiring harness clips and routing straps; unplug connectors from seat modules and body harness.
- Remove the old harness and install the replacement by routing it following original clips and grommets to avoid chafing.
- Reconnect all plugs securely, torque seat bolts to manufacturer specification and reconnect the battery.
- Perform a function check: electric adjustment, heaters, airbag warning lamp, and seatbelt buckle sensors. Use diagnostic equipment if needed to clear faults.
Installation Recommendations
- Always disconnect the battery before starting work on seat wiring and airbags.
- Inspect connector pins and grommets for corrosion or damage; use contact cleaner where appropriate.
- Route the harness exactly as the original, securing all clips to prevent contact with seat rails or sharp edges.
- When replacing connectors, use proper crimping tools and heat-shrink protection to maintain reliability.
- After installation, verify airbag system status and clear any stored fault codes with compatible diagnostic equipment.
Why This Part Fails Most Often
Front seat wiring harnesses most commonly fail due to mechanical wear where the harness moves against seat rails and metal edges during seat adjustments. Repeated flexing causes individual wires to break or insulation to wear through, producing intermittent faults. Corrosion from moisture ingress, damaged grommets, poor previous repairs or connector pin corrosion will also lead to loss of function. Impacts during seat removal/install or rodent damage are less common but possible causes.
Notes
Includes original-style connector interfaces. Attention: This item is supplied without relays. Check the vehicle for any related relay modules if seat functions are still inoperative after harness replacement.
