Buick 1997 Riviera Owner's Manual page 158

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 dealer.
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
4. Press MIN and 000 will appear on the display.
until SEC shows on the display.
5. Press MIN again to make the last two digits agree
6. Press H R S to make the first one or two digits agree
with your code.
with your code.
7. Press AM-FM
after you have confirmed that the
code matches the secret code you have written down.
The display will show ---, indicating that the radio is
no longer secured.
If the code entered is incorrect, SEC will appear on the
display. The radio will remain secured until the correct
code is entered.
When battery power is removed and later applied to a
secured radio, the radio won't turn on and LOC will
appear on the display.
To unlock a secured radio see "Unlocking the
Theft-Deterrent Feature After a Power Loss" earlier
i n
this section.
3-17