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ECU Power Source Circuit: Procedure

  1. CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the O25 or O33 ECU connector.
      Fig 1: Checking O25 & O33 ECU Connector Terminals
      GTY315422Courtesy 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
      O25-1 (IG) - Body ground*1
      O33-1 (IG) - Body ground*2      		 Ignition switch ON 10 to 16 V
      Ignition switch off Below 1 V
      • *1: w/ Wireless Door Lock Control System
      • *2: w/o Wireless Door Lock Control System
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O25-12 (GND) - Body ground*1
      O33-12 (GND) - Body ground*2      		 Always Below 1 Ω
      • *1: w/ Wireless Door Lock Control System
      • *2: w/o Wireless Door Lock Control System
      TEXT IN ILLUSTRATION

      *A w/ Wireless Door Lock Control System
      *B w/o Wireless Door Lock Control System
      *a Front view of wire harness connector
      (to Tire Pressure Warning ECU and Receiver)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   2 

  2. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL  .
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