What's the matter if the car key doesn't respond when unlocking?

[DeClara]

If the car doesn't respond when pressing the unlock button on the key, there could be several possible reasons: 1. The car key battery is dead. This situation is quite common but hard to determine. If the battery hasn't been replaced for a long time, this might be the cause, and simply replacing the battery can solve it. 2. Severe signal interference in the surrounding environment. Try moving the car to another location and test again. If it works, it indicates strong signal interference near the original spot. 3. The key's control unit is damaged. 4. The second key is left inside the car (there's already a key inside). 5. The car wasn't shifted to P (Park) before turning off the engine (some models require shifting to P before turning off). 6. Another possibility is dirt inside the key causing poor contact. Cleaning it with alcohol can help.