1996 GMC Jimmy Owner's Manual - Page 148

Locking the Theft System I . Write down any six-digit number and keep it in a safe place separate from the vehicle. 2. Turn the ignition to the ACCESSORY or RUN position. Unlocking the Theft System After a Power Loss Enter your secret code as follows;pause no more than 15 seconds between steps: 1 . Turn the ignition on with the radio off. 2. Press SET and 000 will appear on the display. 3. Press POWER to turn the radio off. 4. Press the 1 and 4 buttons together. Hold them down until --- shows on the display. Next you will use the secret code number which you have written down. 3. Press SCAN to make the first digit appear. 4. Press SEEK right arrow or SEEK left arrow to make the next two digits agree with your code. 5 . Press BAND and 000 will appear on the display again. Now you are ready to enter the last three digits of your code. 5. Press SET and 000 will appear on the display. 6. Press SCAN to make the first digit appear. 7. Press SEEK right arrow or SEEK left arrow to make the next two digits agree with your code. 6. Repeat Steps 3 and 4 for the last three digits of your code. 8. Press BAND and 000 will appear on the display again. Now you are ready to enter the last three digits of your code. 9. Repeat Steps 6 and 7 for the last three digits of your code. 7. Press BAND after you have confirmed that the code matches the secret code you have written down. The time will be displayed indicating that the system is disabled. If the display shows SEC, the numbers entered did not match your secret code and the unit is still secured. When battery power is given to a secured radio, the radio won't turn on and LOC will appear on the display. 10. Press BAND and the display will show REP for about five seconds and then 000 will appear on the display. 1 1. Repeat Steps 6 through 10.This time the display will show SEC to let you know that your radio is secure. 3-15