I need more information. When the radio is on, does the display show 4 lines like this. ---- or does it spell the word "lock" on the display. If it says "lock" , you must take it to a G.M. dealer .
If it shows the dash lines, then turn off the radio.Turn the key to "run". Hold the preset buttons 5 & 6 down for 5 seconds or so until you see the ----. Using the seek /scan button, enter 0000.If it doesn't unlock, then some other 4 digit code was previously entered. Off to G.M. you must go.
SOURCE: Power Drivers Seat will not move back and forth on
check fuse also check for disconnected wire under the seat
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