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Inspection 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 SPECIFIED CONDITION CHART

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

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R24-12 (E) - Body ground Always Below 1 Ω
      Fig 1: Identifying R24 ECU Connector Terminals
      G04945826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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