Step 1, Agility + Sneaking at a difficulty TBD by the GM to physically get over to a Vehicle unnoticed. I usually set the Difficulty based on foot traffic and neighborhood security rating (Cameras/Police Drones). Head to the bad part of town and look for a car parked out on the street.
Step 2, Agility + Locksmith vs Device Rating to remove the lock covering and get a chance to Direct Access the Vehicle. Alternatively, Hardware + Logic, or whatever the counter to the appropriate Anti-Theft Rating is if one is installed.
Step 3, Direct Access, Hack on the Fly, Hacking plus Logic vs Firewall + Willpower.
Step 4, Turn off Wireless.
Step 5, Drive it like you stole it.
Step 6, As a GM feel glad that you can simply machine gun the team's car without making the Rigger cry.