One problem related to electrical system has been reported for the 1999 Toyota Sienna. The most recently reported issues are listed below.
Power door locks have started to fail on my 1999 Sienna le. The driver's door seems to be the problematic part of the system. The other doors seem to want to respond but driver door makes a 'click, click, click' sound and doesn't respond. Key usually works to lock and unlock but not consistently. Dangerous since people could be trapped in vehicle during an accident, etc and other possibly dangerous scenarios could occur. Reporting this since it most likely has happened to others and wanted it on record. Driver and others could be trapped inside which is dangerous.