What to Do When the Car Key Flashes Red Light and Cannot Unlock?

[IsabelLynn]

When the car key flashes a red light and cannot unlock, it is usually due to a depleted key battery. Simply replacing the key battery will resolve the issue. Relevant details are as follows: 1. Introduction: The primary function of a car remote key is to remotely lock and unlock the car doors. The working principle of a car remote key involves the owner pressing a button on the key, which then sends a signal. This signal contains specific command information. The car's antenna receives the signal, and after authentication by the Body Control Module (BCM), the actuator performs the lock/unlock action. 2. Main Functions: In addition to controlling the door locks, a car remote can also operate the windows and the trunk. When you need to improve air circulation inside the car for ventilation or to remove odors, you can conveniently use the remote to roll down the windows.