GM Service Manual Online
For 1990-2009 cars only

Important: The radio must be unlocked and no owner's code can be currently stored in the radio to change the owner's code. The radio will display 1:00 when unlocked. To determine whether or not there is an owner's code stored press and hold push button numbers 1 and 4 until the display changes. If SEC is displayed there is an owner's code stored. If "- - -" is displayed there is no code stored.

To Remove Owner's Code

(To Deactivate the Theft-Deterrent From the Unlocked Mode, Deterrent Activated:)

    Important: Either the owner's code or the factory backup code can be used to remove the owner's code.

    Important: The theft-deterrent is already deactivated and no code is stored if the display changes to "- - -".

  1. Turn the radio OFF. Press and hold push button numbers 1 and 4 for about 6 seconds until the display changes to read SEC.
  2. Press HR to set the first two digits (0-19) of the code.
  3. Press MN to set the next two digits (0-99) of the code.
  4. Press the AM/FM button to enter the code.

Theft-Deterrent is deactivated when "- - -" appears on the display and then the time of day displays.

To Add Owner's Code

(To set the User Code (Activate) From the Unlocked Mode, Deterrent Deactivated:)

    Important: If SEC displays, the theft-deterrent is already activated. This means the old code must be removed before entering a new code.

  1. Turn the radio OFF. Press and hold push button numbers 1 and 4 for about 6 seconds until the display changes to "- - -".
  2. Press HR to set the first two digits (0-19) of the code.
  3. Press MN to set the next two digits (0-99) of the code.
  4. Important: If "- - -" displays after pressing AM/FM, the owner's code has not been entered.

  5. Press the AM/FM button to enter the code.
  6. When REP then 000 are displayed, repeat Steps 2 through Step 4. This confirms the owner's code and activates the theft-deterrent. SEC appears on the display indicating that the theft-deterrent is active, then the time of day appears on the display.

Anytime battery power is cycled and ignition is applied the LOC appears on the display. The system locks. To unlock the system use the owner's code or the factory backup code. Refer to Radio Theft-Deterrent Unlocking After Power Loss .