Description
Complete harness for the front driver and passenger seats for PEUGEOT 407. Attention: Without relays!
This complete seat wiring harness is a direct replacement for Peugeot 407 front seats. It routes power and signals for seat adjustment motors, heating elements and seat occupancy/buckle sensors where fitted. Supplied as shown (without relays), this harness is often searched by part number 9649424580 and is suitable for professional workshops and competent DIY mechanics working on Peugeot 407 vehicles.
Replacing the seat harness restores the original electrical functionality of the front seats and avoids intermittent faults caused by damaged wiring or connectors. The harness is delivered ready to install; ensure correct routing and secure fastening to prevent chafing and stress at movement points.
Technical Information
- Manufacturer: Stellantis / Peugeot / Citroën
- Model: Peugeot 407
- Product Codes: 9649424580
- Additional Numbers: NFP (as marked); Without Relays
Installation Recommendations
- Always disconnect the battery before starting to avoid short circuits and airbag faults.
- Follow the vehicle manufacturer procedure to remove the seat and access all connectors safely.
- Unplug seat connectors carefully, release all clips and routing points, and transfer or replace fixation points as required.
- Route the new harness exactly as the original, keeping it clear of sharp edges and moving parts; secure with factory-style clips or appropriate ties.
- After full reassembly, reconnect the battery and verify seat functions. Use a diagnostic tool to clear and check for any related fault codes.
Basic Replacement Steps
- Park on level ground, engage parking brake and disconnect negative battery terminal.
- Remove front seat following manufacturer instructions to access harness connections.
- Document connector locations or take photos, then unplug and remove the old harness.
- Install the new harness, reconnect all plugs, fix routing clips and refit the seat.
- Reconnect the battery and test all seat functions (motors, heaters, sensors); scan for faults and clear as necessary.
Most Common Failure Causes
Seat harnesses typically fail due to mechanical wear at flex points where the cable moves with the seat, chafing against metal edges, connector corrosion from moisture or spills, rodent damage, or damage sustained during accidents or improper seat removal. Electrical faults commonly present as loss of power seat movement, heater failure, intermittent sensor signals or airbag/occupancy warnings.
Notes for Buyers
Part number 9649424580 is the reference commonly used when searching for this harness. The item is supplied without relays as marked. Always confirm that this harness matches the equipment level and connector layout of the vehicle before installation.
