Buick 1999 Riviera Owner's Manual page 158

4. Press the 1 and 4 buttons together. Hold them down
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until shows on the display. Next you will use the
secret code number which you have written down.
5. Press MIN and 000 will appear on the display.
6. Press MIN again to make the last two digits agree
with your code.
7. Press HRS to make the first one or two digits agree
with your code.
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8. Press AM FM after you have confirmed that the
code matches the secret code you have written down.
The display will show REP to let you know that you
need to repeat Steps 5 through 7 to confirm your
secret code.
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9. Press AM FM and this time the display will show
SEC to let you know that your radio is secure.
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Unlocking the Theft Deterrent Feature After a
Power Loss
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition on. LOC will appear on the display.
2. Press MIN and 000 will appear on the display.
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3. Press MIN again to make the last two digits agree
with your code.
4. Press HRS to make the first one or two digits agree
with your code.
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5. Press AM FM after you have confirmed that the
code matches the secret code you have written down.
The display will show SEC, indicating the radio is
now operable and secure.
If you enter the wrong code eight times, INOP will appear
on the display. You will have to wait an hour with the
ignition on before you can try again. When you try again,
you will only have three more chances (eight tries per
chance) to enter the correct code before INOP appears.
If you lose or forget your code, contact your dealership.
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Disabling the Theft Deterrent Feature
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition to ACCESSORY or RUN.
2. Turn the radio off.
3. Press the 1 and 4 buttons together. Hold them down
until SEC shows on the display.
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