Here's a breakdown of troubleshooting steps:
1. Check the remote's battery: This is the most common cause. Replace the battery in your remote control with a fresh one of the correct type (usually a CR2032).
2. Try the key in the driver's door lock: If the central locking works using the key in the driver's side door, the problem likely lies with the remote itself or its programming.
3. Check the fuses: Consult your owner's manual to locate the fuses related to the central locking system and check if any are blown. Replace any blown fuses with the correct amperage.
4. Resynchronize the remote (if applicable): Some older Ford Mondeos might have a re-synchronization procedure, but this isn't consistently documented and varies depending on the specific model and year within the P-registration range. There's no guaranteed method for this without a detailed owner's manual for your *exact* model. This often involves inserting the key into the ignition and following specific steps to pair the remote. Again, check your owner's manual.
5. Professional help: If none of the above works, the problem could be more complex. You may have a faulty receiver in the car, a problem with the central locking module, or an issue with the wiring. Take your car to a qualified auto locksmith or Ford specialist for diagnosis and repair.
In short: Start with the simplest solutions (battery, fuses). Your owner's manual is your best resource, but even then, a re-sync procedure might not exist for your specific model. Don't attempt anything you're unsure about; you could cause further damage.
