How to Deal with Buick Excelle Door Auto-Unlocking Issue?
2 Answers
Open the driver's side door of the Buick Excelle. If the anti-theft system of the Buick Excelle is locked, press the door unlock button for 3 seconds. Depress the brake pedal of the Buick Excelle. Press the one-touch start button of the Buick Excelle to start the engine. The dashboard will light up, indicating that the Buick Excelle's engine has been started. Hold down the door unlock button of the Buick Excelle for 3 seconds to unlock the door.
I encountered the same issue last time when driving my old Buick Excelle. After struggling for a while, I found it was caused by a stuck central locking relay. This problem is particularly common, especially in vehicles over ten years old. It could be either relay contact burning and sticking, or aging return springs in the door lock actuator motors. Another possibility is water intrusion or program malfunction in the BCM (Body Control Module), which requires connecting to a computer to check fault codes. First, try disconnecting the negative battery terminal for three minutes to reboot the system—this often provides a temporary fix. If that doesn't work, you'll need to remove the door panel to inspect the actuator. At a repair shop, replacing the entire lock mechanism plus labor costs around 400 yuan. Don't be fooled into replacing the entire BCM module!
