GMC 1998 Yukon - Disabling the Theft-Deterrent Feature

If you enter the wrong code eight times, INOP will
appear on the display. You will have to wait an 11our
with the ignition
on before you can try again. When you
try again, you will only have three chances to enter the
correct code before lNOP 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
until SEC shows on the display.
4. Press MN and
000 will appear on the display.
5. Press MN again to make the last two digits agree
with your code.
6. Press HR to make the first one or two digits agree
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 in
this section.
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