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Inspection Procedure

  1. INSPECT FUSE (ECU-IG, ACC, ECU-B) 
    1. Disconnect the ECU-IG, ECU-B and ACC fuses from the driver side junction block.
    2. Measure the resistance of the fuses.

      Standard resistance: 

      Below 1 Ω 

    NG : REPLACE FUSE 

    OK : GO TO NEXT STEP 

  2. CHECK WIRE HARNESS (GATEWAY ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the G1 ECU connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE AND RECEIVER CONDITION SPECIFICATION

      Tester connection Specified condition
      G1--24 (GND) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE AND RECEIVER CONDITION SPECIFICATION

      Tester connection Condition Specified condition
      G1--10 (BATT) - G1--24 (GND) Always 10 to 14 V
      G1--2 (ACC) - G1--24 (GND) Power switch ON (ACC) 10 to 14 V
      G1-1 (IG) - G1--24 (GND) Power switch ON (IG) 10 to 14 V

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 1: Identifying G1 ECU Connector
    G04476409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

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