Tools You'll Need:
* New Door Lock Actuator: Make sure you get the correct one for your specific door (driver's side, passenger's side, front, or rear).
* Screwdrivers: Phillips head and possibly flathead, depending on your door panel fasteners.
* Panel Removal Tools: Plastic pry tools are ideal to avoid scratching the door panel.
* Socket Set (possibly): Some models might require sockets to remove bolts.
* Wire Connectors/Crimps (Possibly): If the connectors are damaged or you need to extend wires.
* Electrical Tape: To secure any connections.
* Torque Wrench (Recommended): To avoid over-tightening fasteners.
* Shop Rags or Paper Towels: To keep things clean.
Steps:
1. Disconnect the Battery: This is crucial to prevent short circuits and potential damage to your car's electrical system.
2. Remove the Interior Door Panel: This is the most challenging part. You'll need to carefully pry off the panel using your plastic tools. There are usually clips and screws holding it in place. Start by removing the screws around the edges of the panel. Refer to a repair manual (Haynes or Chilton) or online video specific to a 1999 Mazda Protege for precise locations of these fasteners. Be gentle to avoid breaking the clips.
3. Locate the Actuator: Once the door panel is removed, you should see the door lock actuator. It's usually located near the door handle mechanism.
4. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the actuator. Take a picture or note how the wires are connected if you're unsure.
5. Remove the Actuator: This usually involves removing some screws or bolts securing it to the door. Again, consult a repair manual or video for the specifics. You might need to maneuver the actuator slightly to clear the door mechanism.
6. Install the New Actuator: Reverse the removal process. Make sure the actuator is correctly seated and all screws/bolts are tightened securely.
7. Reconnect the Electrical Connector: Carefully plug the connector back into the new actuator. Ensure a good connection.
8. Reinstall the Door Panel: Carefully put the door panel back in place, ensuring all clips are correctly engaged and screws are tightened.
9. Reconnect the Battery: Reconnect the battery terminals.
10. Test the Lock: Test the door lock using the key fob, the inside door lock switch, and the key in the door to ensure the new actuator is working correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 1999 Mazda Protege is highly recommended. It will provide detailed instructions and diagrams that are far superior to generic instructions.
* Online Videos: Search YouTube for "1999 Mazda Protege door lock actuator replacement." Videos can often visually demonstrate the process, making it easier to understand.
* Door Panel Clips: Be very careful when removing and reinstalling the door panel. The plastic clips are fragile and can easily break. You might consider replacing them if they are damaged.
* Wiring: If the wiring to the old actuator is damaged, you may need to repair or replace it.
This is a general guide. The exact procedure might differ slightly depending on your vehicle's specific configuration. Always prioritize safety and consult a professional if you're unsure about any step.
