* Broken or disconnected linkage: The electric motor moves a series of levers and rods (the linkage) that actually move the seat. One of these parts might be broken, disconnected, or jammed. You'll need to access the underside of the seat to inspect this. This often involves removing the seat to get a good look.
* Worn-out gear: The motor might be turning a gear that's worn down or stripped. This is less likely if the motor sounds strong, but possible. Again, you'll need to access the mechanism to check.
* Seized mechanism: Grease or other debris might have accumulated, preventing smooth movement of the seat components.
* Bad switch: Although you say the motor turns, a faulty switch might not be sending a full or consistent signal to the motor. It could be sending a weak signal causing the motor to struggle.
How to troubleshoot:
1. Safety First: Disconnect the negative battery terminal before you begin any work under the seat to prevent accidental short circuits.
2. Inspect the Switch: Check the seat controls themselves for any obvious damage or issues. Try using the switch repeatedly to see if it's intermittently working.
3. Access the Seat Mechanism: This is the trickiest part. You'll likely need to:
* Remove the seat: This usually involves removing bolts under the seat and disconnecting electrical connectors. Consult your owner's manual for specific instructions.
* Inspect the linkage: Once the seat is out (or partially out, depending on access), carefully inspect all the levers, rods, and gears connected to the motor. Look for broken or bent parts, disconnections, and signs of binding or seizing. Lubricate any moving parts with a suitable lubricant (like white lithium grease) if they appear dry or stiff.
4. Test the Motor (carefully): With the seat removed, you might be able to directly test the motor's power using a multimeter or by temporarily connecting power to it (ONLY if you are comfortable with electrical work and understand the risks). This will help determine if the motor itself is faulty.
If you're not comfortable working on car mechanisms: Take your car to a qualified mechanic. Attempting repairs without the necessary knowledge and tools can lead to further damage. The repair cost will depend on the specific problem. It could be as simple as lubricating the mechanism or as complex as replacing the motor or the entire seat mechanism.
