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Power Source Circuit: Procedure

  1. INSPECT FUSE (ECU-IG No. 1, PSB) 
    1. Remove the ECU-IG No. 1 and PSB fuses from the main body ECU.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      ECU-IG No. 1 fuse Always Below 1 Ω
      PSB fuse

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the E41 and E42 seat belt control ECU connectors.
      Fig 1: Identifying E41 And E42 Seat Belt Control ECU Connector Terminals
      GTY153167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      E42-8 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      E41-7 (+B) - Body ground Always 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E41-8 (PGND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. REPLACE SEAT BELT CONTROL ECU. Refer to  REMOVAL 
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