General Information

Component Location





General Description

If the BCM receives wipe auto switch "ON" signal with IGN2 "ON", it controls wiper low or high relay according to input signal from rain sensor.
When wiper switch is set to "AUTO", M/F (multi function) switch transmits a signal about wiper switch position (for instance INT2,INT1,INT0) to BCM thought LIN communication line
[BCM output signal (BCM to rain sensor)]
BCM sends a sensitivity signal of the wiper auto switch to the rain sensor. The requested sensitivity signal consists of a modulated pulse waveform.




[BCM input signal (Rain sensor to BCM)]
The rain sensor sends back a signal (rain detected, low speed request, high speed request) to the BCM. The signal of the rains sensor consists of a modulated pulse waveform.




*The rain sensor shall output the various modes according to the following chart:





[ Rain sensor output signal (Rain sensor to BCM)]

DTC Description

This code is set if the rain sensor doesn't receive message from BCM or BCM detects abnormal signal from rain sensor during IG KEY "ON" & wiper switch "AUTO".
Possible cause is as below ;
1. when the rain sensor is shoot after detached from front glass.
2. Input or output signal line of the rain sensor open circuited.
3. Disconnected rain sensor connector.
4. Input or output signal line of the rain sensor short to ground.

DTC Detecting Condition





Diagnostic Circuit





Signal Waveform




Fig 1) Rain sensor and BCM's signal waveform when wiper switch is positioned to the "auto fast"




Fig 2) Rain sensor and BCM's signal waveform when wiper switch is positioned to the "auto slow"