1993 Buick Park Avenue Owner's Manual - Page 156

To Unlock The System Aftera Power Loss When battery power is reapplied to a secured radio, the radio won't turn on and "LOC" will appear in the display. Enter your secret code as follows; pause no more than 15 seconds between steps. Step 1. Turn the ignition ON (Radio off.) Step 2. Press the SET button. The displaywill show "000". Step 3. Enter the six digits the code following steps 6 of thru 9 on thepreceding page. The displaywill show the number as entered. Step 4. Press the AM/FM button and the time appearsindicating that the disabling sequence was successful. If the displayindicates "SEC", the number did not match and the unit is still secured. Disabling The Theft System Step 1. Press presets 1 and 4 for 5 seconds with the ignition "On" and radio power "Off ". The displaywill show "SEC", indicating the unit is in the secure mode. Step 2. Press the SET button. The display will show "000". Step 3. Enter the first three digitsof the code following step 6 and 7 of the preceding directions. The display will show the numbers as entered. Step 4. Press the AM-FM button. The radio will display "000". Step 5. Enter the second three digitsof the code. The display will show the numbers as entered. Step 6. Press the AM-FM button. If the display shows ---" , the disabling sequence was successful. (The numbers matched the user-selected code or the factory back-up code) and the unit is in the UNSECURED mode. If the display shows "SEC", the disabling sequence was unsuccessful and the numbers did not match either of the codes and the unit will remain in the SECURED mode. "