GM Service Manual Online
For 1990-2009 cars only

Programmable automatic power door locks are intended to provide enhanced security and convenience by automatically locking and unlocking doors. This features lets you program your power door locks to one of four different modes.

Customizing the Automatic Door Locks

Mode 1: All doors automatically lock when the transaxle is shifted out of PARK (P). The doors will remain locked unless manually unlocked or the LOCK button is pressed. All doors will unlock when the transaxle is shifted into PARK (P) and the key is turned to OFF.

Mode 2: This mode is only available with the remote keyless entry transmitter, if equipped. All doors automatically lock when the transaxle is shifted out of PARK (P). Automatic driver's door only unlock when the transaxle is shifted into PARK (P) and the key is turned to OFF.

Mode 3: All doors automatically lock when the transaxle is shifted out of PARK (P). No automatic door unlock.

Mode 4: No automatic door lock or unlock.

Before your vehicle was shipped from the factory it was programmed in Mode 1. To determine the current mode of the vehicle or to change to a different mode, do the following:

  1. Ensure the shift lever is in PARK (P) and all doors are fully closed throughout this procedure. Turn the ignition to ON.
  2. Press and hold LOCK on either power door lock switch for 10 seconds. Release the switch when you hear the chime.
  3. Count the number of chimes you hear. The number of chimes tells you which mode your vehicle is in. You can change the mode by pressing and holding LOCK on the power door lock switch (two chimes for Mode 2, three chimes for Mode 3 and four chimes for Mode 4).
  4. Repeat Step 2 until you hear the number of chimes that matches the mode you want.

The mode you selected is now set.