The contact owns a 2014 Toyota Sienna. The contact stated that while opening the driveras side sliding door, the drive belt snapped. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the sliding door drive belt. The vehicle was not repaired. The contact also stated that the same failure later occurred on the passengeras side sliding door. The manufacturer was not notified of the failure. The failure mileage was 155,000.