THEFT DETERRENT SYSTEM Power Source Circuit

DESCRIPTION

Based on changes in the power source voltage, the main body ECU (multiplex network body ECU) can detect if the battery has been disconnected and reconnected.

WIRING DIAGRAM

B004I9IE02

CAUTION / NOTICE / HINT

Note


  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*


    • *: w/ Smart Entry and Start System

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*

    Click here


    • *: w/ Door Control Battery

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SUPPLY)


    1. Disconnect the 3B*1 or 3C*2 instrument panel junction block assembly connectors.


      • *1: w/ Door Control Battery

      • *2: w/o Door Control Battery

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      w/ Door Control Battery
      Tester Connection Condition Specified Condition
      3B-23 - Body ground Always 8.5 V or higher
      Standard Voltage
      w/o Door Control Battery
      Tester Connection Condition Specified Condition
      3C-1 - Body ground Always 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the main body ECU (multiplex network body ECU).

      Click here

      B004IZ2C02
      *A w/ Door Control Battery *B w/o Door Control Battery
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      w/ Door Control Battery
      Tester Connection Condition Specified Condition
      3B-23 - MB-31 (BECU) Always Below 1 Ω
      Standard Resistance
      w/o Door Control Battery
      Tester Connection Condition Specified Condition
      3C-1 - MB-31 (BECU) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here