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 (mulity function) switch transmits a signal about wiper switch posion (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 pluse 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 pluse waveform.
*The rain sensor shall output the various modes accoding to the following chart:
NO
MODE
Duty Cycle
1
OFF
9.5% +/-3%
2
Fault 1 Detected
23.8% +/-3%
3
Fault 2 Detected
38.0% +/-3%
4
Fault 3 Detected
52.4% +/-3%
5
Rain Detected
66.7% +/-3%
6
Low Speed Request
81.0% +/-3%
7
High Speed Request
95.2% +/-3%
Overall Period must be 15 mSec
[ Rain sensor output signal(Rain sensor to BCM)]
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. Disconnectted rain sensor connector.
4. Input or output signal line of the rain sensor short to ground.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check the signal between BCM and rain sensor
? The rain sensor doesn't receive message from BCM for more than 0.5s.
Enable Conditions
? When no signal from BCM
Threshold value
? Output signal with duty cycle 52.4% +/- 3%
Detecting time
? 0.5 s