How to Solve Weak Car Key Signal?
2 Answers
Generally, there might be two situations. First, it could be due to the car battery being low on power. If the car has no power, no matter how the key senses, it won't help. There are two methods to improve the car key signal: increasing the antenna length and increasing the transmission power. Detailed explanations are as follows: 1. Increasing the antenna length: To increase the antenna length, you need to open the car key. Since the method to open each car model's key is different, it won't be elaborated here. Find the antenna soldering point on the car key's mainboard and solder suitable antenna material. Some copper wires can be used as antenna material. 2. Increasing the transmission power: The most effective way to increase the radiation power is to replace the car's transmission power or write high-power transmission codes into the car key module. Another method is to replace the car key's battery, changing one battery to three batteries to increase the current technically, which also has a good effect.
Last time my car key signal suddenly weakened, and I almost couldn't unlock the door. Later I found out the coin battery was dead, so I replaced it with a new one myself—the model number was written in the manual. If replacing the battery doesn't work, check if there are strong signal interference sources nearby, such as near mall security gates or router clusters. Sometimes, if the key is kept squeezed in a pants pocket for a long time, the internal wiring may have poor contact. In such cases, try restarting the vehicle first by pressing the key against the push-start button for a few seconds. If the issue persists, the only option is to visit a 4S shop to test the signal receiver module—they can diagnose it much faster with professional equipment. To maintain the key, avoid drops and impacts, as the electronic components are quite delicate. Using a key cover helps a lot.
