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Headlight Cleaner Switch Circuit: Procedure

  1. INSPECT 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
      A43-2 (H) - Body ground Light control switch off and headlight cleaner switch on 11 to 14 V
      A43-2 (H) - Body ground Headlight cleaner switch off Below 1 V

    NG → See step   2 

    OK → See step   6 

  2. INSPECT HEADLIGHT CLEANER SWITCH ASSEMBLY 
    1. Remove the headlight cleaner switch assembly. Refer to REMOVAL [06/2012 - ] .
      Fig 1: Identifying Headlight Cleaner Switch Assembly Connector Terminals
      GTY399829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (L) - 4 (B) Headlight cleaner switch off 10 kΩ or higher
      1 (L) - 4 (B) Headlight cleaner switch on Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Headlight Cleaner Switch Assembly)

    NG → See step   7 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER SWITCH ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H5-4 (B) - A43-2 (H) Always Below 1 Ω
      H5-4 (B) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT CLEANER SWITCH ASSEMBLY) 
    1. Disconnect the 3A instrument panel junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-43 - H5-1 (L) Always Below 1 Ω
      3A-43 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL [06/2012 - ] .
      Fig 2: Identifying Instrument Panel Junction Block Assembly Connector Terminals
      GTY405588Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      TEXT IN ILLUSTRATION

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

    NG → See step   8 

    OK → See step   9 

  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2012 - ]  
  7. REPLACE HEADLIGHT CLEANER SWITCH ASSEMBLY. Refer to  INSPECTION [06/2012 - ] 
  8. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [06/2012 - ] 
  9. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2012 - ] 
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