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Power Source Circuit: Wiring Diagram

Fig 1: Power Source Circuit - Wiring Diagram
G04065014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INSPECT FUSE (BAT, ECU-B2, DOOR) 
    1. Remove the ECU-B2 and BAT fuses from the cowl side junction block RH.
    2. Remove the DOOR fuse from the cowl side junction block LH.
    3. Measure the resistance of the fuses.

    Standard resistance: 

    Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (BODY ECU (MAIN) - BATTERY) 
    1. Disconnect the 2C and 2Q junction block connectors.
    2. Measure the voltage of the wire harness side connectors.

    Standard voltage 

    VOLTAGE CONDITION

    Tester Connection Specified Condition
    2Q-22 (BECU) - Body ground 10 to 14 V
    Tester Connection Specified Condition
    2C-1 (BDR1) - Body ground 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (BODY ECU (MAIN) - BODY GROUND) 

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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