1995 GMC Sonoma Owner's Manual - Page 130

To Lock The System: 1. Write down any 6 digit numberand keep it in a safe place. 2. Turn the ignition tothe ACC (Accessory) orRUN position. 3. Press the PWR knob tot r the radio off. un 4. Press the 1 and 4 buttons together. Hold them down until shows on thedisplay. You are now ready to enter your secret Don't wait more than 15 code. seconds betweensteps. 5. Press SET and "000" will appear on the display. 6. Press the SEEK or 4 button to make the first number appear. 7. Press SCAN to make the next two numbers agree your code. with 8. Press BAND and "000"will appear again. Now you are ready to enter the lastthree digits of your code. 9. Repeat steps6 and 7 for the lastthree digits of your coae. 10. Press BAND and "rEP" will appear for5 seconds and then "000" will appear. 11. Repeat steps 6 through 10. This time "SEC" will appear -indicating that theradio is secure. To Unlock The System After A Power Loss When batterypower is reapplied to a secured radio, radio won't turn on the and "LOC"will appear on the display. Enter your secret code follows. Pause no as more than 15 seconds between steps. 1. Turn the ignitionon. (Radio off.) 2. Press the SETbutton. The display will show "000". 3. Enter the six digits of the code followingsteps 6-9 above. The display will show the numbers as entered. 4. Press theBAND knob and the time appears indicating that the disabling sequence was successful. the display indicates "SEC", the If numbers did not match the unit is stillsecured. and 3-16