One problem related to windshield wiper/washer has been reported for the 2004 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sienna based on all problems reported for the 2004 Sienna.
: the contact stated in a heavy rain, the windshield wipers dislodged and locked up. The dealership determined this was a safety feature, when there is too much pressure on the wipers, the motor locks up to prevent the motor from overheating. The dealership reset the wipers.