Component Location
General Description

Rain sensing wiper system controls wiper automatically in accordance with detected rainfall without extra signal of driver. It consists of rainsensor, multifunction switch and wiper, and operates when the wiper switch is moved to AUTO position and the Ignition switch is in IGN2 position. Rainsensor consists of two light emission diode(LED), two photo diode, optical fiber and coupling pad. Rainsensor detects rainfall by measuring reflexibility of light from LED to photo diode. When rainsensor detects rainfall, it delivers signal to BCM and BCM operates wiper automatically

DTC Description

The ECM sets DTC B1905 if there’s any internal fault in rain sensor.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Check duty cycle

● Faulty Rainsensor

Enable Conditions

● Engine ‘ON’ & Wiper ‘AUTO’

Threshold value

● Duty cycle = 23.8% ± 3%

Detecting time

● 1 Sec

FAIL SAFE

-

Specification

※ Duty cycle of rainsensor as a function of sensor mode.

Mode

Duty Cycle

OFF

9.5% ± 3%

Fault 1 Detected

23.8% ± 3%

Fault 2 Detected

38.0% ± 3%

Fault 3 Detected

52.4% ± 3%

Rain Detected

66.7% ± 3%

Low Speed Request

81.0% ± 3%

High Speed Request

95.2% ± 3%

Schematic Diagram
note
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