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 HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY)

   
   

   1. Disconnect the A43 headlight cleaner control relay connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition A43-1 (HDLO) - Body ground Light control switch in head position Below 1 V Light control switch off 11 to 14 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY) Click here

   OK

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

2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY)

   
   

   1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A43-1 (HDLO) - 3A-43 Always Below 1 Ω A43-1 (HDLO) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 3A-43 - MB-15 (HRLY) Always Below 1 Ω 3A-43 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here