Kia Niro: Windshield Wiper/Washer / Rain Sensor Description and operation

Description
Integrated Rain Sensor

Integrated rain sensor (A) controls three systems: front wiper, auto-light, and central air conditioner.

1.

Wiper Control System

When the multifunction switch on the right receives "AUTO" switch signal, the integrated rain sensor detects the amount of rainfall. The sensor is installed inside the upper part of the front window for wiper motor control.

This system automatically controls the operating duration and speed of the wipers depending on the measured amount of rainfall even if the driver does not operate the wiper switch.

Functions and Operating Principles

Basic Principle

1.

Detecting the amount of rainfall

The light (beam) emitted from light emitting diodes (LED) is totally reflected on the external surface of the windshield and comes back to the photo diodes. When there is water on the external surface of the windshield, the light is optically separated and reflected partially and the remaining brightness is measured by the photo diodes. Water remaining on the windshield results in the light being not totally reflected. The loss of brightness due to this indicates how much the glass surface is wet.

Interference

Rain sensor might malfunction due to the interferences listed below.

1.

Dust on the measuring surface and other surfaces on the light path (surface of light emitting diodes and photo diodes, fiber optics, bracket, and glass surface of windshield joint area) weakens the received light.

2.

Movement of windshield and bracket

3.

Movement of bracket due to vibration

4.

Damaged wiper blade

  

When the integrated rain sensor does not operate or malfunctions, the driver should operate the wiper switch manually.

Automatic Operation

1.

Operational status of rain sensor

Operation Mode
Operation
Direct Mode
This is the basic operating status when the rain sensor detected dry windshield with wiper switch in"Auto". In this mode, the integrated rain sensor determines the operating mode of wipers depending on the rainfall and its duration.
Intermittent Mode
Integrated rain sensor activates the intermittent mode when wiper operation is done successively more than twice with a pause of 0.5 - 5 seconds.
Low Speed
The wiper operates continuously in low speed
High Speed
The wiper operates continuously in high speed

Safety Function

1.

When there is ice or foreign matter in the detecting area, integrated rain sensor cannot recognize the condition for operation correctly.

Detecting Special Conditions

1.

Rain sensor

Special Condition
Operation based on special conditions detecting
Splash
When integrated rain sensor detects a high level of water (splash) in Direct or Intermittent mode, the system switches from Park to High speed. Then, wiping is done once in High speed and once more in Low speed. If the condition of rainfall does not change after wiping, it returns to the original condition (Direct or Intermittent).
Smearing
Smearing is a thin oil film that has dried fast and occurs when a small amount of rainfall is wiped by a dirty or worn-out wiper blade. Operational signal should not be issued when smearing occurs in Direct or Intermittent mode.
Dirt
When no change is detected after wiping, integrated rain sensor determines that the windshield is dirty. In this state, operational signal should not be issued. If the windshield becomes clean (for example, by washer fluid), the integrated rain sensor returns to the normal condition.
Washer fluid
Integrated rain sensor does not respond to the washer fluid during the Washer mode. In other words, wiping speed does not change even if the washer fluid is sprayed (automatic operation of the washer pump is not reflected in the functioning of integrated rain sensor).

Rain Sensor Schematic diagrams
Circuit Diagram ...

Rain Sensor Repair procedures
Removal    • The dust or foreign substance on the rain sensor has a bad effect upon the r ...

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