What Causes a Spare Key to Fail in Opening the Car Door?

[DeConnor]

Car spare key fails to open the door due to a dead remote key battery, a depleted car battery, or strong signal interference in the vicinity. You can use the hidden mechanical key inside the spare key to open the door. If the mechanical key also fails to open the door, it indicates a door lock malfunction. Additional information about the car's smart key system is as follows: 1. Keyless Entry Function: When the key approaches the vehicle, the door automatically unlocks and the anti-theft alarm is deactivated, accompanied by the turn signals flashing twice. When the key moves away from the vehicle, the door automatically locks and the anti-theft alarm is activated, with the turn signals flashing once and the horn sounding briefly. 2. Automatic Window Closing and Security Function: When the key is 3-5 meters away from the vehicle, the door automatically locks and the anti-theft alarm is activated, with the turn signals flashing once and the horn sounding briefly.