1997 Buick Riviera Owner's Manual - Page 157

8. Activating Theft-Deterrent the Feature The instructions which follow, explain how to enter your secret code to activate the THEFTLOCK system. It is all recommended that you read through nine steps before starting the procedure. 9. NOTE: If you allow more than15 seconds to elapse between any steps,the radio automatically reverts to time and you must start procedure over atStep 4. the 1. Write down any three or four-digit number from 000 to 1999 and keepit in a safe place separatefrom the vehicle. Press AM-FM after you have confirmed that the you code matches the secret code have written down. REP to let youknow that you The display will show 5 need to repeat Steps through 7 to confirm your secret code. Press AM-FM and this timethe display will show you SEC to let know that your radio is secure. Unlocking the Theft-Deterrent Feature After a Power Loss Enter your secret code as follows; pause no more than 15 seconds between steps: 1. LOC appears when the ignition is on. 2. Turn the ignition to ACCESSORY or RUN. 3. Turn the radio off. 2. Press MIN and000 will appear on the display. 4. Press the 1 and 4 buttons together. Hold them down 3. Press MIN again to make the last two digits agree the until --- shows on the display. Next you will use with your code. secret code number which you have written down. 4. Press H R S to make thefirst one or two digits agree 5. Press MIN and000 will appear on the display. with your code. 6. Press MIN again to make the last two digits agree 5. Press AM-FM after you have confirmed that the with your code. code matches the secret code you have written down. The display will show SEC, indicating radio is the 7. Press H R S to make thefirst one or two digits agree now operable and secure. with your code.