I thought this was an option after a certain year, possibly '00... If your car supports it try this:
Its relatively easy.
Turn the ignition to Off (the spot where you'd pull your key out)
Pull the Mall PGM fuse from the box.
Turn the ignition to Accessory (1 click counterclockwise from Off, or to the left)
Push the Unlock button. You'll hear a number of chimes corresponding to the setting your car is in, the factory default is 3. Push the Unlock button once more to move the setting to 4 and you'll be set.
