LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2007 >> Prius Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Audio System & Visual System >> Audio And Visual System >> Gateway ECU Power Source Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 

      STANDARD RESISTANCE

      Tester connection Specified condition
      G1-24 (GND) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.
      Fig 1: Identifying G1 ECU Connector
      G05189915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      STANDARD VOLTAGE

      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 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

scientia non olet · About LEMON Manuals