How to Open the Door with ATSL Mechanical Key?

[Savannah]

Here is the introduction to opening the door with ATSL mechanical key: 1. To open the door with the mechanical key for ATSL, first pull the door handle to the open position, insert the mechanical key into the slot at the bottom of the lock cylinder cover, 2. Pry it outward, then move the lock cylinder cover backward, and insert the key into the lock cylinder. 3. After the door is opened, the lock cylinder cover needs to be reset. First, insert the two tabs on the back of the lock cylinder cover between the black seal and the metal base, then pull the door handle to the open position, move the lock cylinder cover forward, and press it to snap it into place, then release the door handle. Below is more information about the remote key: 1. If the remote key has low battery or is affected by signal interference, when starting the vehicle, the driver information center will display a message indicating that no remote key is detected, or prompting you to place the remote key in the front central armrest storage box slot before starting the vehicle. 2. To start the vehicle in this case, first open the central armrest storage box, place the key in the slot, and when the vehicle is in P or N gear, press the brake pedal and press the ENGINE START/STOP button. 3. When the remote key has low battery, replace the battery as soon as possible to ensure normal use. When replacing the battery, be careful not to touch any circuits in the key, as static electricity from the human body may damage the remote key.

[SanNora]

I've been driving a Cadillac ATSL for several years and often use the mechanical key to open the door when the remote fails. There's a small plastic cover under the driver's door handle—just pry it open with a finger or key to reveal the keyhole. Insert the mechanical key, turn it counterclockwise, and the door unlocks easily. Once inside, you can start the engine using the ignition switch. The whole process is simple and reliable, especially in emergencies like a dead battery. I recommend every owner practice locating it and keep the cover clean to avoid fumbling in the rain. I also keep a spare key in my wallet to save time in emergencies. Regularly wiping the keyhole during car washes prevents rust, a good habit to extend its lifespan.