Rain Sensor Circuit

WIPER / 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 windshield wiper ECU from the windshield wiper switch through the CAN line, and from the rains sensor through the LIN line. Based on these signals, the windshield wiper 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 causes of the symptoms are any of the following conditions shown in the charts.

It is Raining but Wiper does not Operate





It is not Raining but Wiper Operates





Wiper Operation is Irregular





OK:
Causes of symptoms are one or more of above conditions
NG -- CHECK WIPER OPERATION
OK -- END
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.

Result





B -- CHECK RAIN SENSOR
A -- Continue to next step.
4. CHECK OPERATION OF WIPER
(a) Check operation of the wipers.

Result





B -- CHECK RAIN SENSOR
A -- Continue to next step.
5. CHECK WIPER RUBBER
(a) Activate the washer and check the wiping ability of the wiper.
OK:
No residue after wipe
NG -- REPLACE WIPER RUBBER
OK -- Continue to next step.
6. READ VALUE USING TECHSTREAM (COMBINATION SWITCH)
(a) Using the Techstream, read the Data List.

Body No. 5





OK:
Windshield wiper switch operates.
NG -- REPLACE WINDSHIELD WIPER SWITCH
OK -- Continue to next step.
7. CHECK RAIN SENSOR
(a) Check that the rain sensor is installed properly.
OK:
When viewed from outside of vehicle, rain sensor tape is not peeling and has no air bubbles or dust on it, and sensor has not come off bracket
NG -- REPLACE RAIN SENSOR TAPE
OK -- Continue to next step.
8. READ VALUE USING TECHSTREAM (RAIN SENSOR)
(a) Using the Techstream, read the Data List.

Rain Sensor





OK:
Rain sensor operates.
NG -- REPLACE RAIN SENSOR
OK -- Continue to next step.
9. CHECK RAIN SENSOR
(a) Set the windshield wiper switch to AUTO. Flatten the end of a cotton swab soaked with water so that it is 4 to 6 mm (0.157 to 0.236 in.) wide. Touch the swab to the rain sensor detection area and check that the wiper LO operation occurs once.

Standard Measurement









Result





C -- REPLACE WINDSHIELD WIPER ECU
B -- END
A -- REPLACE RAIN SENSOR
10. CHECK RAIN SENSOR
(a) Check that the rain sensor is installed properly.
OK:
When viewed from outside of vehicle, rain sensor tape is not peeling and has no air bubbles or dust on it, and sensor has not come off bracket
NG -- REPLACE RAIN SENSOR TAPE
OK -- REPLACE RAIN SENSOR