DTC 42: Ecu Communication System Malfunction: Wiring Diagram
WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
For ECU communication system malfunction wiring diagram, see Fig 1.
For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.