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ECU Power Source Circuit: Procedure

  1. INSPECT FUSE (RADIO NO. 1, P RR-IG2, P-ACC) 
    1. Remove the RADIO NO. 1, P RR-IG2 and P-ACC fuses from the passenger side junction block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      RADIO NO. 1 fuse Always Below 1 Ω
      P RR-IG2 fuse Always Below 1 Ω
      P-ACC fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (ECU - VEHICLE BATTERY AND BODY GROUND) 
    1. Disconnect the R24 ECU connector.
      Fig 1: Identifying R24 ECU Connector Terminals
      GTY138871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      R24-1 (+B) - Body ground Always 11 to 14 V
      R24-13 (IG2) - Body ground Power switch ON (IG) 11 to 14 V
      R24-14 (ACC) - Body ground Power switch ON (ACC) 11 to 14 V

      Standard resistance

      Tester Connection Condition Specified Condition
      R24-12 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION 

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