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ECU Power Source Circuit: Procedure

  1. CHECK HARNESS AND CONNECTOR (FRONT LIGHT ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the A51 ECU connector.
      GTY356251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      A51-2 (WIG) - Body ground Engine switch on (IG) 11 to 14 V
      A51-2 (WIG) - Body ground Engine switch off Below 1 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (FRONT LIGHT ECU - BODY GROUND) 
    1. Disconnect the A50 ECU connector.
      GTY349900Courtesy 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
      A50-2 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2012 - ]  
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