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 is detached from front glass or there is a problem in adhesive condition between the rain sensor and front glass during IG KEY "ON" & wiper switch "AUTO".
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check rain sensor adhesive state
? Abnormal adhesive condition of the rain sensor
? Detached rain sensor from front glass.
Enable Conditions
Threshold value
? Signal output with 38.0% +/- 3%
Detecting time
? 0.5 s