Hyundai i-30: Windshield Wiper/Washer / Rain Sensor

Hyundai i30 (PD) 2018-2024 Service Manual / Body Electrical System / Windshield Wiper/Washer / Rain Sensor

Components and components location
Components and Components Location

Schematic diagrams
Circuit Diagram

Description and operation
Integrated Rain Sensor
Integrated rain sensor (A) controls three systems: front wiper, auto-light, and central air conditioner.
Wiper Control System
When "AUTO" switch signal is received from the multi-function switch on the right, 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 operation duration and speed of the wiper depending on the measured amount of rainfall even if the driver does not operate the wiper switch.

Functions and Operating Principles
Basic Principle
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.
Rain sensor might malfunction due to the interferences listed below.
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.
Movement of windshield and bracket
Movement of bracket due to vibration
Damaged wiper blade
When the integrated rain sensor does not operate or malfunctions, the driver should operate the wiper switch manually.
Automatic Operation
Operational status of rain sensor
Operation Mode
Direct Mode
It is the normal operational status of the integrated rain sensor when the wiper switch is in "Auto" and the sensor detected dry windshield. Based on this state, integrated rain sensor determines the operation mode of wiper 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
When there is ice or foreign substance in the detecting area, integrated rain sensor cannot recognize the condition for operation correctly.
Detecting Special Conditions
Rain sensor
Special Condition
Operation based on special conditions detecting
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 is a thin oil film that has dried fast and occurs when a small amount ofraindrops is wiped by a dirty or worn-out wiper blade. Operational signal should not be issued when smearing occurs in Direct or Intermittent mode.
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).

Repair procedures
The dust or foreign substance on the rain sensor has a bad effect upon the rain sensor capability,so protect the sensor surface with protection cover until installing the rain sensor to bracket for accurate function.
The coupling pad on the rain sensor surface has adhesive strength, so the coupling pad could stick to the windshield depending on the surrounding conditions during the using time.
If the rain sensor is removed by force, it could be damaged. So make sure to separate the rain sensor from the windshield carefully.
Remove the rain sensor cover (A).

Disconnect the wiring harness connector (A).

Be careful not to damage the cover latch by applying excessive force. To remove the bracket, pull the holes of the bracket outside using a small flat-head screwdriver (A).

Rain sensor module is attached to the front windshield by glue. When replacing the front windshield, remove the rains sensor module form the existing front windshield and install it on the new front windshield.
Check the operation of the rain sensor and the light sensor before mounting.
Check the sensor for silicon damage.
Check whether the rain sensor connector is tightened.
Check whether the rain sensor and bracket are properly tightened.
Check whether the sensor mounted area is free from foreign matters.
Recalibrate sensitivity of the swtich if the auto-wiping operation is insensitivity or too much sensitive.

In case the silicone of the rain sensor is normal or slightly damaged as shown in the below images, it can be reused.
Damage within 1.5 mm of outer part

In case the silicone of the rain sensor is damaged as shown in the below images, it should be replaced with a new silicone.
Foreign substances


In case the silicone of the rain sensor is damaged it should be replaced it as shown below.
1) Remove the damaged silicone gel pad from the lens plate completely.

Be careful not to damage or contaminate the surface of the lens plate during removal.
2) Attach the new silicone gel pad aftet removing the silicone paper (A) then remove the transperent film (B).

When attaching the silicone gel pad to the sensor, be careful not to contaminate
It is very important that the silicon (coupling pad) is completely pushed against the windshield and stuck without any air bubble.

In case of replacing the damaged windshield, you may reuse the undamaged exisitng rain sensor.
The windshield glass has to be clean and free of contamination or foreign substances.
Connect the rain sensor connector.
Push one of the latch of spring arm (A) down until it snaps and you hear a click sound.
And then push the latch of second spring arm (B) for keeping the sensor in right position.

Do not snap both spring arms at the same time.
An incorrectly mounted snap connection may cause malfunctions of the rain/light sensor.

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