UPON TURNING KEY IN IGNITION, PASSENGER, OUT OF HABIT, REACHE DOVER RIGHT SHOULDER TO GRAB SEAT AND SHOULDER BELT LIKE SHE WAS IN HER OWN VEHICLE. HOWEVER MOTORIZED SHOULDER BELT WAS OPERATING AT SAME INSTANT, AND CONTACTED WITH PASSENGER'S RIGHT INDEX FINGER, PARTIALLY SEVERING THE TIP. ONCLEAR WHETHER FINGER WAS INJURED BY SOMETHING ON MOTORIZED BELT OR BY SHARP EDGES AT LOCKING END OF CARRIER TRACK. *AK