Rain Sensor Circuit

WIPER AND WASHER: WIPER AND WASHER SYSTEM: Rain Sensor Circuit
- Rain Sensor Circuit

DESCRIPTION

The auto wiper system adjusts the wiper speed to the optimum speed based on the amount of rain. The rain sensor mounted on the windshield detects rainfall. This system operates when the windshield wiper switch is set to AUTO. The rain sensor sensitivity can be adjusted with the rain sensor adjusting switch. Signals are sent to the front light ECU from the windshield wiper switch through the CAN line, and from the rain sensor through the LIN line. Based on these signals, the front light ECU operates the wiper and determines its operation speed.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIPER

(a) Check the symptoms of the wiper. Check if the symptoms can be corrected with the information below.

It is raining but wiper does not operate:





It is not raining but wiper operates:





Wiper operation is irregular:





OK -- END
NG -- Continue to next step.

2. CHECK WIPER OPERATION

(a) Set the windshield wiper switch to the LO and HI setting, and check that the wipers operate normally.

OK:

Wipers operate normally.

NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.

3. CHECK WINDSHIELD WIPER SWITCH

(a) Set the windshield wiper switch to AUTO, and check the problem symptom.





B -- CHECK RAIN SENSOR
A -- Continue to next step.

4. CHECK APPEARANCE

Check the vehicle.





B -- CHECK RAIN SENSOR
A -- Continue to next step.

5. CHECK WIPER RUBBER

(a) Activate the washer and check the wiper's ability to wipe.

OK:

No residue after wipe

NG -- REPLACE WIPER RUBBER Removal
OK -- Continue to next step.

6. CHECK RAIN SENSOR

(a) Check that the rain sensor is installed properly.

OK:

When viewed from outside vehicle, rain sensor's tape is not peeling, and has no air bubbles or dust

NG -- REPLACE RAIN SENSOR TAPE Removal
OK -- Continue to next step.

7. READ VALUE USING TECHSTREAM (RAIN SENSOR)

(a) Check the Data List for proper functioning of the rain sensor.

Rain sensor:





OK:

Rain sensor operates

NG -- REPLACE RAIN SENSOR Removal
OK -- Continue to next step.

8. CHECK RAIN SENSOR

(a) Set the windshield wiper switch to AUTO. Wet a swab and squeeze the tip so that it is 4 to 6 mm wide. Touch the swab to the rain sensor detection area and check that the wiper LO operation occurs once.





B -- REPLACE RAIN SENSOR Removal

A -- REPLACE FRONT WIPER MOTOR Removal

9. CHECK RAIN SENSOR

(a) Check that the rain sensor is installed properly.

OK:

When viewed from outside vehicle, rain sensor's tape is not peeling, and has no air bubbles or dust

NG -- REPLACE RAIN SENSOR TAPE Removal

OK -- REPLACE RAIN SENSOR Removal

10. CHECK RAIN SENSOR

(a) Check that the rain sensor is installed properly.

OK:

When viewed from outside vehicle, rain sensor's tape is not peeling, and has no air bubbles or dust

NG -- REPLACE RAIN SENSOR TAPE Removal

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR