Secure valuables and parcels. Never leave your checkbook, credit cards or other valuables unattended in a vehicle. When shopping, lock parcels and other valuables in the trunk. If your vehicle does not have a trunk, make sure parcels are not in plain view. Discourage the thief.
Some thieves specialize in lifting the door lock buttons with a coat hanger.
Consider purchasing smooth, non-flared lock buttons for your vehicle doors. Park in well lighted, busy areas. This is important for your personal safety as well as for the protection of your vehicle. If you use a commercial parking lot, be sure you receive a claim check. Try to avoid parking your vehicle in public lots for long periods of time.