Headlight Dimmer Switch Circuit [12/2018 - 06/2021]: Description

WARNING: This page is about a different car, the 2022 Toyota Prius, 2021 Toyota Prius, 2020 Toyota Prius, and 2019 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

The main body ECU (multiplex network body ECU) receives the following switch information:

Light control switch in off*1, DRL OFF*2, tail, head or AUTO position
Dimmer switch in high, low or high flash (pass) position
Fog light switch in front or off position*3

*1: w/o DRL OFF Switch
*2: w/ DRL OFF Switch
*3: w/ Front Fog Light