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Power Source Circuit: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT MULTIPLEX NETWORK BODY ECU (BATB, BECU - ALTB TERMINALS) 
    1. Disconnect the instrument panel J/B (IA, ID) connectors.
      Fig 1: Identifying Instrument Panel J/B (IA, ID) Connector Terminals
      GTY182005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Voltage

      Tester Connection Condition Specified Condition
      IA-1 (BATB) - Body ground Always 10 to 14 V
      ID-10 (BECU) - Body ground Always 10 to 14 V
      ID-16 (ALTB) - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BATB, BECU OR ALTB CIRCUIT) 

    OK: Go to next step 

  2. INSPECT MULTIPLEX NETWORK BODY ECU (GND TERMINAL) 
    1. Disconnect the instrument panel J/B (IF, IM) connectors.
      Fig 2: Identifying Instrument Panel J/B (IF, IM) Connector Terminals
      GTY177164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Resistance

      Tester Connection Condition Specified Condition
      IF-10 (GND1) - Body ground Always Below 1 Ω
      IM-9 (GND2) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

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