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Immobilizer Code ECU Power Source Circuit: Wiring Diagram

Fig 1: Immobilizer Code ECU Power Source Circuit Wiring Diagram
G04021458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INSPECT FUSE (SECURITY) 
    1. Remove the SECURITY fuse from the cowl side junction block RH.
    2. Measure the resistance of the fuse.

    Standard resistance: Below 1 Ω 

    NG : REPLACE FUSE 

    OK : GO TO NEXT STEP 

  2. CHECK WIRE HARNESS (IMMOBILIZER CODE ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the K58 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    K58-8 (GND) - Body ground Below 1 Ω

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    K58-1 (+B) - Body ground 10 to 14 V

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 2: Identifying K58 ECU Connector Terminals
    G04021459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE IMMOBILIZER CODE ECU 

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