1. Faulty key fob: The key fob may be damaged or defective, causing it to only unlock the driver's side door. Try using the spare key fob (if available) to see if it works properly.
2. Receiver issue: The receiver in the car that receives the signal from the key fob may be faulty or damaged. This can prevent the car from unlocking the other doors even when the key fob is working correctly.
3. Software glitch: A software glitch in the car's electronic control unit (ECU) can also cause this issue. Software updates may be available to fix such glitches.
4. Damaged wiring: Damaged or loose wiring between the receiver and the door locks can also prevent the other doors from unlocking.
5. Faulty door lock actuators: The door lock actuators that control the locking and unlocking mechanism of the doors may be faulty. This can prevent the other doors from unlocking even when the signal from the key fob is received correctly.
6. Central locking system issue: If the car has a central locking system, a problem with the central locking module can cause this issue.
Recommended solutions:
1. Check and replace the key fob battery: A weak or dead battery in the key fob can cause it to malfunction. Replace the battery with a new one and try again.
2. Reprogram the key fob: Follow the reprogramming instructions provided in your car's owner's manual. This can help resolve any synchronization issues between the key fob and the car's receiver.
3. Have the car diagnosed: If the above solutions don't help, it's best to have the car diagnosed by a qualified mechanic or BMW dealership. They can pinpoint the exact cause of the issue and provide the appropriate repair.
