Rain Sensor Circuit: Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
This circuit provides power to operate the rain sensor
The auto wiper system operates when the windshield wiper switch assembly is in the AUTO position The rain sensor is connected to other ECUs through the multiplex communication line (BEAN).
When the ram sensor detects raindrops in the detection area on the windshield glass, the sensor sends a wiper control signal according to the amount of raindrops to the main body ECU LH (cowl side junction block LH)
The ram sensor also sends signals to the adaptive radar cruise control system and the mirror defogger system