GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Astro - 2WD 🢒 Features and Controls 🢒 Doors and Locks 🢒 Programmable Automatic Door Locks

Your vehicle is equipped with an auto lock/unlock feature which enables you to program your power door locks.

Your vehicle left the factory programmed to have all the doors lock automatically when the shift lever is moved out of PARK (P). All of the doors will unlock when the shift lever is moved back into PARK (P). The following instructions detail how to program your door locks.

To enter the program mode you need to do the following:

  1. Begin with the ignition in OFF. Then, pull back on the turn signal/multifunction lever all the way toward you and hold it while you perform the next step.
  2. Turn your key to RUN and OFF twice. Then, with the key in OFF, release the turn signal/multifunction lever. Once you do this, you will hear the lock switch lock and unlock.

You are now ready to program the automatic door locks. Select one of the following four programming options and follow the instructions. You will have thirty seconds to begin programming. If you exceed the thirty second limit, the locks will automatically lock and unlock to indicate that you have left the program mode. If this occurs, repeat the procedure beginning with Step 1. You can exit the program mode any time by turning the ignition to RUN. The locks will automatically lock and unlock to indicate that you are leaving the program mode. If the lock/unlock switches are not pressed while in the programming mode, the auto lock/unlock setting will not be modified.

The following is a list of the available programming options:

    • All doors lock/Only the driver's door unlocks: Press the lock side of the power lock switch on the door panel once and then the unlock side once.
    • All doors lock/All doors unlock: Press the lock side of the power lock switch on the door panel once, and then the unlock side twice.
    • All doors lock/None of the doors unlock: Press the lock side of the power lock switch on the door panel once, and then the unlock side three times.
    • No doors lock/None of the doors unlock: Press the lock side of the power lock switch on the door panel twice. This turns off the automatic lock feature.

For more information, see your dealer.