Why Can't the Other Three Doors Be Locked with the Key?

[MacJuliet]

Reasons why car doors cannot be locked include remote lock failure, strong magnetic signal interference around the car, and radio signal jammers. Remote Lock Failure: If you are using a remote key to lock the doors, it is likely that the remote lock is malfunctioning or the antenna of the car's remote transmitter has aged, causing the remote key to fail. In this case, you can use the spare mechanical key to lock the doors. Strong Magnetic Signal Interference Around the Car: Another possible reason is strong magnetic signal interference around the car. Since smart keys use low-intensity radio waves, they may not function properly under magnetic interference. Radio Signal Jammers: If there is a specific location where the remote lock frequently fails, the car owner should be cautious about door jammers. Criminals may use radio signal jammers that emit electromagnetic waves at the same frequency as the lock signal, thereby blocking the electronic code of the car's central locking system and temporarily disabling it.