Well, I disconnected the battery for a few minutes and when I reconnected the battery, the radio displays "LOC".
I pressed the 2 & 3 preset buttons for 8 seconds and the radio displayed the backup code: 141 191.
Called the 1-800 Delco Service Support number and got a reset code of 020 604.
I tried programming in the code but it just reverts to the " -:--" display.
