What are the methods to unlock a car's anti-theft system when it is locked?
2 Answers
Here are the methods to unlock a car's anti-theft system when it is locked: 1. Keep the key in the ignition switch for half an hour. Use the original key to turn on the ignition switch and leave the key in place for about half an hour. During this waiting period, do not turn off the ignition switch or start the engine. 2. Use a password decoder to retrieve the password. The anti-theft password of the engine control unit is the same as the password of the anti-theft control module chip. Therefore, you can remove the engine control unit chip, use a password decoding device to read its password, input the engine control unit password into the anti-theft control module, and then start the engine. 3. Repeatedly unlock multiple times. You can use the method of repeatedly locking and unlocking the door mirrors to release the locked state. The reason is that the trigger switch inside the door lock assembly is worn or the circuit has poor contact. During the process of repeatedly unlocking multiple times, the contact condition can be improved.
When the car anti-theft system is locked, I usually first check the key condition. If it's a smart key, the battery might be dead—try replacing it with a new one. Then, check if the car's main battery is depleted, as sometimes low voltage can trigger the anti-theft lock. Remove the car key, turn off all electrical devices, open the hood, locate the negative terminal of the battery, and use a wrench to loosen and remove the negative cable. Wait for 5 to 10 minutes before reconnecting it. This can reset the system and often unlock it. If that doesn’t work, try using the spare key to start the car—many people forget to carry their spare key, so keeping it in a safe place is important. If none of these methods work, avoid tampering with the wiring and causing damage. It’s best to call a 4S shop or a repair shop with professional equipment for diagnosis. They will use a scanner to read error codes and address the issue accordingly. For regular maintenance, I recommend servicing the anti-theft system periodically, ensuring timely replacement of key batteries, and avoiding long periods of parking to prevent battery aging. Safety first—don’t tinker with it yourself in the middle of the night or in remote areas to avoid accidents.
