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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 B2274: ACC Monitor Malfunction >> Procedure

DTC B2274: ACC 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
      GTY118688Courtesy 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 COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR OUTLET RELAY) 
    1. Disconnect the RD and RA J/B connectors.
      Fig 2: Identifying Cowl Side J/B RH Connectors Terminals
      GTY145849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      RD-2 - RA-5 or RD-7 Always 68 to 250 Ω at 20°C (68°F)

    NG → See step   8 

    OK: Go to next step 

  5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 3: Identifying J/B Connector With Power Source Control ECU Connector
      GTY145851Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - RD-2 Always Below 1 Ω
      J55-11 (ACCD) - Body ground Always 10 kΩ or higher
      RA-5 - Body ground Always Below 1 Ω
      RD-7 - Body ground Always Below 1 Ω
    2. Connect each J/B connector with the power source control ECU connector disconnected.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - 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 4: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      GTY119529Courtesy 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
      J55-11 (ACCD) - 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 B2274 is not output.

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK → CHECK INTERMITTENT PROBLEMS 

  8. REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU 
    1. Replace a faulty J/B and then connect the power source control ECU connector.
      Fig 5: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      GTY119529Courtesy 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
      J55-11 (ACCD) - 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 6: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      GTY119529Courtesy 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
      J55-11 (ACCD) - 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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