WIPER AND WASHER SYSTEM Headlight Signal Circuit

DESCRIPTION

The headlight cleaner control relay detects the low beam headlights status.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK LOW BEAM HEADLIGHTS OPERATION

   
   

   1. Check that the low beam headlights operate normally Click here.

      OK
      Low beam headlights operate normally.

   
   

   NG

   GO TO LIGHTING SYSTEM Click here

   OK

2. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - MAIN BODY ECU)

   
   

   1. 

      Disconnect the E2 main body ECU (cowl side junction block LH) connector.

   2. Disconnect the headlight cleaner control relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (HDLO) - E2-13 (HDLO) Always Below 1 Ω 1 (HDLO) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

   
   

   1. 

      Disconnect the headlight cleaner control relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 1 (HDLO) - Body ground Engine switch on (IG) Headlight dimmer switch in HEAD 11 to 14 V 1 (HDLO) - Body ground Engine switch on (IG) Headlight dimmer switch not in HEAD Below 1 V

   
   

   NG

   REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here