1. Broken Cable: The seat adjustment mechanism is controlled by cables. A broken or frayed cable can prevent the seat from moving.
2. Malfunctioning Motor: The seat adjustment is powered by an electric motor. If the motor is faulty, it may not have the power to adjust the seat.
3. Damaged Switch: The seat adjustment is controlled by a switch located on the side of the seat. A faulty switch may not send the correct signal to the motor to adjust the seat.
4. Jammed Seat Track: The seat moves on tracks. Debris or corrosion can cause the tracks to jam, preventing the seat from moving.
5. Faulty Control Module: The seat adjustment system is controlled by a computer module. If the module is faulty, it may not receive or send the correct signals to adjust the seat.
Note: These are just some common causes. Your seat might have a different issue depending on your Nissan Primera's year, model, and individual condition. It's recommended to visit an auto repair shop or consult with a professional to properly diagnose and repair the issue.