CAB AND FRAME ACCESS 1 Door Lock and Keys Door Lock Keys To lock or unlock the doors from outside the cab, insert the key in the lock. Turn the key toward the rear to lock; forward to unlock. The same key fits your ignition, doors, and sleeper luggage compartment. Doors can be locked from the inside by using the lock button. Close the door then push the button down to lock. Doors automatically unlock when you open them from inside, and can be locked from the outside with the key or the optional remote keyless entry key fob. Frame-mounted tool box locks and locking fuel tank caps each have individual keys.
WARNING To reduce the chance of death or personal injury, always lock the doors while driving. Along with using the lap shoulder belts properly, locking the doors helps prevent doors from inadvertently opening and occupants from being ejected from the vehicle. 1-12