Dealer Package: Toyota has received a number of reports regarding the power sliding door rear lock assemblies on certain 2011 ? 2018 model year Sienna vehicles. In these reports, corrosion on the position sensor of the left and/or right power sliding door rear lock assembly caused that door to exhibit one or more of the abnormal operations described below: ?During power mode closing operation, as the power sliding door reaches the nearly closed position, the door reverses and moves toward the open position. ?During power mode closing operation, the power sliding door cannot completely close and latch. ?The power mode closing operation of the power sliding door is inoperative. Although the power sliding door rear lock assemblies are covered by Toyota?s New Vehicle Limited Warranty for 3 years or 36,000 miles (whichever comes first), we at Toyota care about the customers? ownership experience. Toyota is now extending the warranty coverage for repairs relating to corrosion on the position sensor of the left and/or right power sliding door rear lock assembly that causes that door to exhibit one or more of the abnormal operations described above. The following information is provided to inform you and your staff of the program notification schedule and your degree of involvement.