The motorized seat belt may chatter or become jammed in its track and not operate properly; Hyundai issued a recall for 1990 - 1994 model years that should correct this concern.
Resources for the Repair and Maintenance of your 1990 Hyundai Sonata
1990 Hyundai Sonata
1990 Hyundai Sonata Problems
1990 Hyundai Sonata Recalls (Recent)
Summary: INSUFFICIENT CLEARANCE COULD CAUSE THE SAFETY CATCH ON THE SECONDARY HOOD LATCH STRIKER TO BIND.Learn more »
Summary: THE MOTORIZED SHOULDER BELT CAN TRAVEL SLOWLY OR CHATTER IN THE TRACK AND MAY EVENTUALLY STOP TRACKING AND BECOME INOPERATIVE.Learn more »