Two problems related to door hinge have been reported for the 1999 Toyota Sienna. The most recently reported issues are listed below.
Upper door mount pillar cracked due to overextension hinge guard failure.
Driver's door was opened and a gust of wind grabbed the door and snatched it off the hinges. The pins popped out, and the door could not be closed. The dealer claimed that the door hinges were not a part of the warranty.