This is the air pump for the rear air suspension. It was mounted behind the left rear wheel on, and slightly below, the framerail. It had to move to accommodate our planned departure angles. Once again, the Lexus adapted easily. Just above the air pump's old mounting spot, inside the vehicle in the left quarter panel, is a little door opening to a space for the factory jack. Since we plan to carry a Hi-Lift jack, this made a perfect new home for the air pump.