Straight from the owners manual

With the keyless entry keypad, you can:
² lock or unlock the vehicle doors without using the key.
Your vehicle has a factory set 5 digit code that operates the keyless entry system. You can also program your own 5 digit personal entry code. The factory-set code is located:

² on the owner’s wallet card in the glove compartment
² taped to the computer module
² or at your dealer.

When pressing the controls on the keyless entry keypad, press the middle of the controls to ensure a good activation.

Programming your own personal entry code
To program your own code:
1. Enter factory set code (keypad will illuminate when pressed).
2. Press 1/2 control within five seconds of step 1.
3. Enter your personal 5 digit code.

Enter each digit within five seconds of previous one.
Do not set a code that includes five of the same number or presents them in sequential order. Thieves can easily figure out these types of codes. Your personal code does not replace the permanent code that the dealership gave you. You can use either code to unlock your vehicle. If a second personal code is entered, the module will erase it in favor of the new code.

If you wish to erase your personal code, use the following instructions:

Erasing personal code
1. Enter factory set code.
2. Press 1/2 control within five
seconds of step one.
3. Press 7/8 control and 9/0 control
at the same time within five seconds
of step 2.
The system will now only respond to the factory set code. Anti-scan feature The keyless entry pad is disabled for 1 minute after 7 unsuccessful attempts at entering a valid key code. The keypad will flash during this 1 minute mode. However, the 7/8 and 9/0 controls will still lock the vehicle.

Locks and Security
Anti-scan will be turned off after:
² one minute of keypad inactivity.
² the remote entry transmitter UNLOCK button is pressed.
² the ignition is turned to the ON position.

Unlocking the doors with the keyless entry system

To unlock the driver door, enter either the factory set code or the
personal code (each digit must be pressed within five seconds of the prior digit). The interior lamps will also illuminate. To unlock all doors, enter the factory set code or personal code (driver
door unlocks) and press the 3/4 control within five seconds.

Locking the doors with the keyless entry system

It is not necessary to enter the factory or personal code prior to lockingall doors. To lock the doors:

² Press the 7/8 control and the 9/0 control at the same time.

Activating/deactivating autolock with the keyless entry system

Before following the activation or deactivation procedures, make sure that the anti-theft system (if equipped) is not armed, ignition is off, and all vehicle doors and liftgate window are closed.

1. Enter 5 digit entry code
2. Press and hold 7/8 control
3. Press and release 3/4 control while holding 7/8 control
4. Release 7/8 control.

The horn will chirp once if autolock was deactivated or twice (one short and one long chirp) if autolock was activated.
To re-activate autolock, repeat steps 1–4.