Question about 1999 GMC Envoy
You can enter the un-lock code provided with your radio by doing the follwing:1 - Turn the ignition to ON, the radio should show LOC2 - Press MN (000 will appear on the radio display)3 - Press MN again to make the last two digits match your radio unlock code4 - Press HR to make the first 2 digits match the radio unlock code5 - Press AM-FM to unlock the radio
If the code is entered correctly the radio will display SEC
Posted on Feb 12, 2012
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Posted on Jan 02, 2017
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