1. Turn the radio on. Make sure the radio is on and displaying "LOC" or "CODE." If the radio is asking for a code, skip to step 3.
2. Press and hold the "Seek" button. While holding down the "Seek" button, turn the radio off. Continue to hold down the "Seek" button for about 10 seconds until the radio turns back on.
3. Enter the unlock code. Use the radio's buttons to enter the unlock code. The code is usually a four or five-digit number. If you don't know the unlock code, you can try to find it in the owner's manual for your vehicle or by contacting your local Buick dealership.
4. Press the "Seek" button again. After you have entered the unlock code, press the "Seek" button to confirm the code.
5. The radio should now be unlocked. If the radio is unlocked, you will see the radio's frequency or station name displayed.
Option 2: Using the Security Code
1. Locate the radio's serial number. The serial number is usually a 10-digit number printed on a label attached to the back of the radio.
2. Contact your local Buick dealership. Give the dealer the radio's serial number, and they will provide you with the security code.
3. Enter the security code. Use the radio's buttons to enter the security code. The code is usually a four or five-digit number.
4. Press the "Seek" button again. After you have entered the security code, press the "Seek" button to confirm the code.
5. The radio should now be unlocked. If the radio is unlocked, you will see the radio's frequency or station name displayed.