DTC P0031 Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032 Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1): Wiring Diagram
WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
Refer to DTC P2195 .