* Binding Mechanism: This is the most likely culprit. Something is preventing the seat from moving. Check for:
* Obstructions: Look under the seat for anything that might be jamming the mechanism (e.g., loose items, floor mats, cables).
* Torn or Damaged Seat Tracks: Inspect the metal tracks the seat glides on. They might be bent, broken, or have debris preventing smooth movement. This is a common problem on older vehicles.
* Worn-out Seat Track Rollers: These are small wheels or rollers that allow the seat to move smoothly along the tracks. Worn-out rollers will cause binding and noise, even if the motor is working.
* Cables: The cables that control the seat's forward/backward movement might be tangled or binding.
* Faulty Switch: The switch itself might be failing. While you hear the motor, the switch may not be sending a proper signal. Try cleaning the switch contacts with electrical contact cleaner. A bad switch would prevent the motor from receiving the correct signals to move in a specific direction, even though it's receiving power (hence the sound).
* Wiring/Connectors: There could be a break or a loose connection in the wiring harness leading to the seat motor. Inspect the wiring carefully for damage or corrosion, especially near the connector plugs to the motor and the switch.
* Seat Motor Gear Failure (Less Likely): Although you hear the motor running, a stripped gear within the motor itself is *possible*, but less likely than the above issues. A stripped gear would prevent movement, but still allow the motor to spin.
Troubleshooting Steps:
1. Safety First: Disconnect the negative battery terminal before working under the seat. This prevents accidental short circuits.
2. Manual Check: Try moving the seat manually (if possible) to see if it's seriously jammed. Don't force it if it's stuck.
3. Visual Inspection: Carefully inspect the seat tracks, rollers, and under the seat for obstructions.
4. Wiring Inspection: Check the wiring harness for damage or loose connections.
5. Switch Test (If Possible): Try to access the wiring connectors to the switch and directly test the power (if you're comfortable with electrical work) or test the switch with a multimeter to ensure it's sending a proper signal when actuated.
If you're not comfortable doing this yourself, take it to a mechanic. The issue is likely a relatively simple mechanical problem (binding) but could be more involved electrical issues requiring a skilled technician. Describing that you hear the motor running is valuable information for a mechanic.
