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Headlight Cleaner Switch Circuit: Procedure

  1. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat. Refer to REMOVAL [09/2012 - ] .
      GTY402615Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Switch Condition Specified Condition
      2 (B) - 5 (E) Headlight cleaner switch ON (Pushed) Below 200 Ω
      2 (B) - 5 (E) Headlight cleaner switch OFF (Not pushed) 10 kΩ or higher

    NG → See step   7 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (RHEOSTAT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the L8 switch connector.
      GTY401564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect L13 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      L8-2 (B) - L13-10 (HDLC) Always Below 1 Ω
      L8-5 (E) - Body ground Always Below 1 Ω
      L13-10 (HDLC) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) 
    1. Disconnect the A6 relay connector.
      GTY395943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      A6-2 (H) - A51-6 (H) Always Below 1 Ω
      A6-5 (FRWA) - A51-7 (FRWA) Always Below 1 Ω
      A6-1 (HDLO) - Body ground Always 10 kΩ or higher
      A6-2 (H) - Body ground Always 10 kΩ or higher
      A6-5 (FREWA) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK FRONT LIGHT ECU 
    1. Measure the voltage according to the value(s) in the table below.
      GTY419118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      A51-5 (HDLO) - Body ground Engine switch on (IG), light control switch OFF 11 to 14 V
      A51-5 (HDLO) - Body ground Engine switch on (IG), light control switch in HEAD Below 1 V
      A51-6 (H) - Body ground Headlight cleaner switch OFF 11 to 14 V
      A51-6 (H) - Body ground Headlight cleaner switch ON Below 1 V
      A51-7 (FRWA) - Body ground Engine switch on (IG), front washer is stopped 11 to 14 V
      A51-7 (FRWA) - Body ground Engine switch on (IG), front washer is operated Below 1 V

    NG → See step   6 

    OK → See step   5 

  5. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2012 - ]  
  6. REPLACE HEADLIGHT CLEANER CONTROL RELAY. Refer to  REMOVAL [09/2012 - ] 
  7. REPLACE LIGHT CONTROL RHEOSTAT. Refer to  REMOVAL [09/2012 - ] 
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