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Home >> Lexus >> 2012 >> IS 250 Base, AWD >> Repair and Diagnosis >> Electrical >> Starter >> Smart Access System (Keyless Start) (Diagnostic Codes & Symptom Tests) >> Smart Access System With Push-Button Start >> DTC B2272: Ignition 1 Monitor Malfunction >> Procedure

DTC B2272: Ignition 1 Monitor Malfunction: Procedure

  1. INSPECT FUSE (AM2) 
    1. Remove the AM2 fuse from the cowl side J/B RH.
    2. Measure the resistance of the fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK CONNECTORS 
    1. Check that the connectors are securely connected and the terminals are not deformed or loose.

      OK

      The connectors are securely connected and the terminals are not deformed or loose.

    NG → REPAIR OR REPLACE CONNECTORS 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the J55 ECU connector.
      Fig 1: Identifying J55 Power Source Control ECU Connector
      GTY142102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-33 (AM1) - Body ground Always 10 to 14 V
      J55-12 (AM2) - Body ground Always 10 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      J55-6 (GND2) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK JUNCTION BLOCK 
    1. RH-IG relay:
      Fig 2: Identifying Cowl Side J/B RH Connectors Terminals
      GTY145849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the cowl side J/B RH connectors.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Condition Specified Condition
        RD-6 - RA-5 or RD-7 Always 136 to 250 Ω at 20°C (68°F)
        RD-6 - RD-12 Always Below 1 Ω
        RD-6 - Body ground Always 10 kΩ or higher
    2. LH-IG relay:
      Fig 3: Identifying Cowl Side J/B LH Connectors
      GTY141999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the cowl side J/B LH connectors.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Condition Specified Condition
        LD-13 - LD-8 or LD-9 Always 68 to 250 Ω at 20°C (68°F)

    NG → See step   8 

    OK: Go to next step 

  5. CHECK WIRE HARNESS (COWL SIDE J/B RH - POWER SOURCE CONTROL ECU AND BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying Cowl Side J/B RH And J55 Power Source Control ECU Connector
      GTY145850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      RD-6 - J55-34 (IG1D) Always Below 1 Ω
      RA-5 or RD-7 - Body ground Always Below 1 Ω
      RD-6 or J55-34 (IG1D) - Body ground Always 10 kΩ or higher
    2. Measure the resistance according to the value(s) in the table below.
      Fig 5: Inspecting Resistance (Cowl side J/B RH - Cowl side J/B LH)
      GTY145853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Condition Specified Condition
      RD-12 - LD-13 Always Below 1 Ω
      RD-12 - Body ground Always 10 kΩ or higher
      LD-8 - Body ground Always Below 1 Ω
      LD-9 - Body ground Always Below 1 Ω
    3. Connect each J/B connector with the power source control ECU connector disconnected.
      Fig 6: Identifying J55 Power Source Control ECU Connector
      GTY132257Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-34 (IG1D) - Body ground Engine switch on (IG) Below 1 V

    NG → See step   9 

    OK: Go to next step 

  6. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the J55 ECU connector.
      Fig 7: Identifying Terminal IG1D Of J55 Power Source Control ECU Connector
      GTY119528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-34 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK: Go to next step 

  7. RECHECK FOR DTC 
    1. Delete the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs again.

      OK

      DTC B2272 is not output.

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK → CHECK INTERMITTENT PROBLEMS 

  8. REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU 
    1. Replace a faulty relay or J/B and then connect the power source control ECU connector.
      Fig 8: Identifying Terminal IG1D Of J55 Power Source Control ECU Connector
      GTY119528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-34 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK → END 

  9. REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU 
    1. Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.
      Fig 9: Identifying Terminal IG1D Of J55 Power Source Control ECU Connector
      GTY119528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-34 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK → END 

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