Battery contact issue
cause analysis
When the back cover is closed, it may squeeze the battery, causing poor contact between the battery and the positive and negative poles, thereby preventing the car key from working properly. The presence of dirt or foreign objects on the positive and negative electrodes of the battery, or poor contact between the spring plate and the positive and negative electrodes, such as dirt, oxidation, etc., can also affect the circuit connectivity after covering the back cover.
solution
Clean the positive and negative poles: Remove the battery, and you will see a buckle fixed on the base of the circuit board above the button. Insert a needle into one side and pull it outwards to remove the button. You can see the base and buttons on the circuit board, and you can hear a crisp sound when pressing the buttons, which is the sound emitted by the spring plate. Clean the contact points and spring plates of the positive and negative poles to solve the problem of button malfunction caused by contact point issues. For example, using a cotton swab or ball dipped in alcohol for wiping.
Adjust battery position: Open the back cover, reposition the battery, ensure that the battery is installed in place, and the positive and negative poles are tightly attached to the contact points. After installation, gently press the battery to make the contact more stable, and then cover the back cover to test whether the car key returns to normal.
The back cover squeezes the internal circuit
cause analysis
Improper installation of the back cover or deformation of the back cover itself can squeeze the circuit board or electronic components inside the car key when covering, causing a short circuit or open circuit in the circuit, thereby affecting the sensitivity of the car key.
solution
Check the back cover: Carefully observe whether the back cover is deformed or damaged. If the back cover is deformed, it may need to be replaced with a new one. At the same time, check if there are any foreign objects inside the back cover and clean them if necessary.
Adjust the position of internal components: Open the back cover and check if the circuit board and electronic components have been squeezed or displaced. If there are, carefully adjust them to the correct position to avoid being squeezed again when the rear cover is closed. After adjustment, gently cover the back cover, being careful not to apply excessive force, and test the function of the car key.
Internal component malfunction
cause analysis
The circuit board and electronic component patches inside the car key may already have poor contact issues, which are further exacerbated by the compression when the back cover is closed, leading to the failure of the car key.
solution
Welding repair: Find a site with good power and visibility, remove the car key, take out the remote control box, use a screwdriver to open the remote control box, and take out the remote control circuit board inside. If poor contact is found on the electronic component patch on the circuit board, a preheated soldering iron needs to be taken out to reinforce and solder the poorly connected patch. After welding, install the circuit board back into the remote control box and test drive. If the car door can be unlocked normally, the repair is successful. But welding operations require high technical requirements, it is recommended to be carried out by professionals.
Re match: Use a computer to re match the matching code of the car key. Sometimes, minor faults in internal components may affect the normal transmission of matching codes, and re matching may solve the problem.
Signal interference
cause analysis
After covering the back cover, it may change the environment of signal transmission inside the car key, making it more susceptible to external signal interference, resulting in unstable signal transmission and ineffective car key function.
solution
Change environment: Move the vehicle to another location, away from signal transmission towers, high-voltage lines, and other sources that may cause signal interference, and then test the vehicle keys again. If the car key returns to normal in the new environment, it indicates that there is signal interference in the previous position.
Check surrounding items: Check if there are any mobile phones or other electronic devices near the car key that may interfere with the signal of the car key. Remove them before attempting again.
