Circuit Description
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.
These DTCs indicate how switch operation as follows:
If DTC is not output when operating switch, switch contact failure is indicated. If DTC is output when not operating switch, it means switch sticks. When something wrong is identified by this diagnosis, inspect each switch. Replace switch if there is a problem, or check wire harness if there is no problem with any switch.