General Information

Front Area Module

B1906 Rain Sensor Fault 2 - General Information

Component Location





General Description

FAM controls the low/high wiper relay according to rain sensor signal when the wiper auto switch is turned to ON under IG ON.
As the wiper INT switch is set at AUTO mode, combination switch transmits value of INT step to ECW by LIN communication. And, ECW communicates with FAM by CAN.
[FAM output signal (FAM -> Rain sensor)]
FAM transmits sensitivity step signal from INT switch to the rain sensor by pulse signal.




[FAM input signal (Rain sensor -> FAM)]
The Rain sensor transmits moisture status and the desired wiper speed to FAM by pulse signal.




* The Rain sensor has various outputs according to each modes as below. (Duty cycle changes)
Rain sensor output signal (Rain sensor -> FAM)






DTC Description

The rain sensor is attached to the front windshield glass. This code is outputted when the rain sensor is attached badly or detached from the front windshield glass.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig.1) "Wiper State" & "Rain Sensor Output" (With wiper switch "AUTO" & engine running)