WIPER AND WASHER SYSTEM Headlight Cleaner Switch Circuit

DESCRIPTION

This circuit detects the conditions of the headlight control rheostat.

The headlight cleaner control relay receives the following signals through the CAN line:

• Headlight control rheostat signal

• Headlight operating signal

• Daytime running light operating signal

• Front washer motor operating signal

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FRONT LIGHT ECU (HDLO SIGNAL)

   
   

   1. 

      Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition A51-5 (HDLO) - Body ground Engine switch on (IG), light control rheostat OFF 11 to 14 V A51-5 (HDLO) - Body ground Engine switch on (IG), light control rheostat in HEAD or TAIL Below 1 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) Click here

   OK

2. CHECK FRONT LIGHT ECU (FRWA SIGNAL)

   
   

   1. 

      Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition A51-7 (FRWA) - Body ground Engine switch on (IG), front washer is stopped 10 to 14 V A51-7 (FRWA) - Body ground Engine switch on (IG), front washer is operated Below 1 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) Click here

   OK

3. CHECK HARNESS AND CONNECTOR (RHEOSTAT - BODY GROUND)

   
   

   1. 

      Disconnect the L8 rheostat connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition L8-2 (B) - Body ground Always 11 to 14 V

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition L8-5 (E) - Body ground Below Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HEADLIGHT CLEANER CONTROL RELAY

   
   

   1. 

      Disconnect the A6 control relay connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition A6-2 (H) - Body ground Always 11 to 14 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) Click here

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

5. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU)

   
   

   1. 

      Disconnect the A6 control relay connector.

   2. Disconnect the A51 ECU connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition A6-1 (HDLO) - A51-5 (HDLO) Always Below 1 Ω A6-1 (HDLO) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

6. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU)

   
   

   1. 

      Disconnect the A6 control relay connector.

   2. Disconnect the A51 ECU connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition A6-5 (FRWA) - A51-7 (FRWA) Always Below 1 Ω A6-5 (FRWA) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

7. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU)

   
   

   1. 

      Disconnect the A6 control relay connector.

   2. Disconnect the A51 ECU connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition A6-2 (H) - A51-6 (H) Always Below 1 Ω A6-2 (H) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE