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Inspection Procedure

  1. CHECK RESISTANCE OF COMMUNICATION LINE 
    1. Disconnect the A14 ECU connector.
    2. Disconnect the 3L J/B connector.
    3. Check the resistance between the wire harness side connectors.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A14-5 (MPX1) - 3L-7 (MPX1) Below 1 Ω
    Fig 1: Identifying A14 ECU Connector And 3L J/B Connector Terminals
    G04093874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  2. CHECK J/B NO. 3 
    1. Disconnect the 3L J/B connector.
    2. Disconnect the 3G J/B connector.
      Fig 2: Identifying Connector Terminals Of 3G-2 And 3L-7
      G04093875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the resistance between the J/B side connectors.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3L-7 - 3G-2 Below 1 Ω

    NG: REPLACE J/B NO. 3 

    OK: Go to next step 

  3. CHECK HEADLIGHT SWIVEL ECU ASSEMBLY (POWER SOURCE) 
    1. Disconnect the A14 ECU connector.
    2. Check the voltage between the wire harness side connector and the body ground.

      Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Position Specified Condition
      A14-12 (IGS) - Body ground Ignition switch ON 10 to 14 V
      A14-2 (IG) - Body ground    
    Fig 3: Identifying Terminals Of A14 IG And IGS
    G04093876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  4. CHECK HEADLIGHT SWIVEL ECU ASSEMBLY (GROUND) 
    1. Disconnect the A14 ECU connector.
    2. Check the resistance between the wire harness side connector and the body ground.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A14-11 (E1S) - Body ground Below 1 Ω
      A14-1 (E1) - Body ground
    Fig 4: Identifying A14 E1 And E1S ECU Terminal
    G04093877Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY 

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