Here's a breakdown of troubleshooting steps and potential problems:
1. Check the Child Lock Mechanism:
* Location: The child lock is usually a small lever or switch on the edge of the rear door, often near the door latch. It might be recessed slightly.
* Operation: Even if you think it's disengaged, try cycling it a few times (on/off/on). Sometimes they get stuck or bind.
2. Check the Interior Door Handle Mechanism:
* Rod Disconnection: The most common issue is a disconnected or broken linkage rod connecting the inside handle to the door latch. This rod runs from the inside handle to the latch mechanism inside the door. You'll need to remove the interior door panel to inspect this.
* Handle Failure: Less common, the inside handle itself could be broken internally. Again, removing the panel is necessary to check.
3. Check the Exterior Door Handle Mechanism:
* Cable Disconnection: Similar to the inside handle, a cable connects the outside handle to the latch. This cable can break or disconnect.
* Handle Failure: The exterior handle mechanism might have failed.
4. Check the Door Latch Mechanism:
* Actuator Failure: The latch mechanism itself might be faulty, preventing it from engaging even when the handles are operated. This is more complex to diagnose and often requires replacement of the entire latch assembly.
* Jammed Latch: Sometimes, the latch can become jammed with debris. Inspect for anything blocking the latch's movement.
To access these parts, you'll need to remove the interior door panel. This usually involves:
1. Removing screws: Look for screws around the edges of the panel (often hidden under small plastic caps).
2. Disconnecting clips: The panel is typically held in place with clips that snap into place. Gently pry the panel away from the door, starting at the bottom. Be careful not to break the clips.
3. Disconnecting electrical connectors: There are usually connectors for the power window, door lock, and courtesy light.
Finding Information:
* Repair Manuals: A Haynes or Chilton repair manual specific to your 1993 Ford Explorer will provide detailed diagrams and instructions for removing the door panel and accessing the internal components of the door locking mechanism. These manuals are usually available at auto parts stores and online.
* Online Forums: Search for Ford Explorer forums (like Explorerforum.com). Someone might have had the same problem and posted pictures or solutions.
Important Note: If you're not comfortable working on car doors, it's best to take your Explorer to a qualified mechanic. Improper repair can damage the door and make the problem worse.
