How to Replace the Battery in a Haima Car Key?
1 Answers
Haima car key battery replacement method is as follows: 1. Open the folding key and forcefully separate the upper and lower parts of the remote. 2. Disassemble the lower part's upper and lower covers, remove the circuit board, and take out the old battery. 3. Insert the prepared new battery into the circuit board with the positive pole facing down, place it into the lower part of the casing, and then snap the upper and lower parts of the remote back together. Extension: A car remote key utilizes the wireless remote control function of the central locking system, allowing doors to be opened and locked from a distance without inserting the key into the lock. Based on their usage methods, they can be divided into three categories: active working mode, passive working mode, and coil induction mode. 1. Active working mode: The principle involves controlling the doors via the vehicle's electronic module and body control module. Simply press the key button to send an unlock/lock command, and after verification by the vehicle's electronic module, the doors can be opened/closed. 2. Remote key coil induction mode: Primarily involves placing 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 situations where the key has no battery, allowing the car to start normally. 3. Remote key passive working mode: When entering the sensing area of the key system, simply touching the door handle causes the carried identity-recognition "key" to receive a low-frequency signal sent by the car. If this signal matches the identity-recognition information stored in the "key," the "key" will be awakened. Upon being awakened, the "key" analyzes the authentication command sent by the car and transmits a corresponding signal, which is encrypted to enhance security. The car compares the received signal with the information stored internally, and if verification is passed, the car unlocks the door.
