It is a bit tricky, more so than need be. The engineers/designers certainly were not interested in user-friendly. Look at your owners manual Page 168. If you do not have your manual you can download, read and if you choose to, print, a pdf file you need Adobe Reader.
Well, dang. It won't allow me to post the link for your manual. Google "2007 Buick La Crosse owners manual", and the file is at or near top, free, courtesy GM.
To program a 2005 Buick LaCrosse remote, first, insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Unlock" button on the driver's side door while turning the ignition switch from "On" to "Off" twice. Release the "Unlock" button, then press and hold both the "Lock" and "Unlock" buttons on the remote for about 15 seconds. Finally, turn the ignition back to "On" and the remote should be programmed.
To replace a keyless remote for a Buick LaCrosse, first, obtain a compatible replacement key fob, either from a dealership or a certified retailer. Next, insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Lock" and "Unlock" buttons on the new remote simultaneously for about 10 seconds, then release them. Finally, turn the ignition off to complete the programming process.
press the door lock open or lock for 5 seconds.
Press the set button then within 10 seconds press the seek and scan buttons to change time.
You press the Auto and Econ buttons at the same time.
To set the clock on a 2007 Buick LaCrosse, turn the ignition to the "On" position without starting the engine. Press the "Menu" button on the radio, then use the radio's knob to scroll to the "Clock" settings. Adjust the hours and minutes using the knob, and press the "Menu" button again to confirm the settings. Make sure to check that the time is correct after setting it.
On a 2010 Buick LaCrosse, the gas tank door is located on the driver's side of the vehicle. It is positioned towards the rear, just behind the rear wheel. To open it, simply press on the door, and it will release. The fuel filler cap is located inside the door.
don't just press the buttons hold them down until the nuber changes
To use the navigation system in a 2011 Buick Lacrosse, press the "NAV" button on the infotainment system. From there, you can input your destination address or search for points of interest using the touchscreen or voice command system. Follow the on-screen directions to navigate to your destination.
press n hold the off and warmer buttons on heater controls while key is on
To open the gas cap on a Buick LaCrosse, first, ensure the vehicle is in the "On" or "Run" position. Locate the gas cap release button, typically found on the driver's side, near the door or on the dashboard. Press the button, and the gas cap door will pop open. Simply twist the gas cap counterclockwise to remove it.
With the radio turned off, you press the SET key, then using the Volume and Tune buttons, you set the time. Once set, press the set button, and your done.