DTC B0126/27, B0127/27: Seat Belt Buckle Switch LH Circuit Malfunction (2005/05-2006/01); Seat Belt Buckle Switch LH Malfunction (2005/05-2006/01): Wiring Diagram
WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.