DTC P0102: Mass Air Flow Circuit Low; DTC P0103: Mass Air Flow Circuit High; DTC P0103: Mass or Volume Air Flow Circuit High Input [06/2014 - 08/2015]: Wiring Diagram
WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.