The GMC Acadia is a full-size SUV that was first introduced in 2007. The Acadia is available with either front-wheel drive or all-wheel drive, and it can seat up to eight passengers. One of the Acadia's safety features is its passive door lock system.
When the Acadia's engine is started, the doors will automatically lock. If any of the doors are opened while the engine is running, they will remain locked. The only way to unlock the doors while the engine is running is by using the power door lock switch or by pressing the unlock button on the remote keyless entry fob.
Once the engine is turned off, all of the doors will automatically unlock. This feature allows you to exit the vehicle quickly and easily in case of an emergency.