* Worn or broken recliner mechanism: This is the most likely culprit. The ratcheting mechanism that holds the seat in place likely has worn-out parts, broken teeth on the gears, or a broken cable or spring. Over time, these parts simply wear out from use.
* Faulty recliner release lever or cable: The lever that controls the reclining action could be malfunctioning, either sticking or not properly engaging the mechanism. The cable connecting the lever to the mechanism could be frayed, broken, or disconnected.
* Loose or broken seat frame components: If the seat frame itself is damaged or loose, this can affect the stability of the reclining mechanism and cause it to pop back up.
* Binding or obstruction: Something might be interfering with the smooth operation of the reclining mechanism. Check for anything caught in the mechanism, such as clothing or debris.
To diagnose the issue:
1. Carefully inspect the recliner lever and its connection: See if it moves freely and feels secure. Look for any signs of damage or breakage.
2. Check the area around the recliner mechanism itself: Look for anything obstructing it. You may need to partially remove the seat cover to see the mechanism clearly.
3. Manually test the mechanism: With the seat reclined, try to feel for any points of resistance or binding in the mechanism. This may require some disassembly.
4. Examine the condition of the ratcheting gears and springs: If accessible, visually inspect these for damage or wear.
Unless you're comfortable with car repairs and have access to replacement parts (which might be difficult for a 1990 vehicle), it's best to take the car to a mechanic or an upholstery shop specializing in car seat repair. They have the tools and expertise to properly diagnose and fix the problem.
