What Causes the Spare Car Key Remote to Stop Responding?
1 Answers
There are two possible reasons why the spare car key remote stops responding: the car battery is low on power, or the key itself has run out of battery. First, check whether the indicator light on the remote flashes when you press the unlock button. If it doesn't flash, the issue lies with the remote itself. There are three main categories of remote keys: Active working mode: This method relies on the vehicle's electronic control module (ECM) and body control module (BCM) to operate the doors. Simply pressing the key button sends an unlock/lock command, which, after verification by the ECM, opens or closes the doors. Coil induction: This primarily involves embedding an encrypted chip inside the key. During the unlocking process, the vehicle's RF transceiver verifies whether the key matches to determine if the engine can be started. This is mainly used in special cases where the key has no battery but the car can still start normally. Passive working mode: When the owner enters the sensing range of the key system, simply touching the door handle triggers the identity-recognition "key" to receive a low-frequency signal from the car. If this signal matches the stored identity information in the "key," the "key" is activated. Once awakened, the "key" analyzes the authentication command sent by the car and transmits a corresponding encrypted signal to enhance security.
