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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 B2275: STSW Monitor Malfunction >> Procedure

DTC B2275: STSW Monitor Malfunction: Procedure

  1. CHECK FOR DTCS 
    1. Delete the DTC. Refer to DTC CHECK / CLEAR .

      HINT: 

      After all DTCs are cleared, turn the engine switch on (IG). After 25 seconds have elapsed, check if the trouble occurs again.

    2. Check for DTCs again.

      OK

      DTC B2285 is not output.

      HINT: 

      If DTC B2285 is output, perform troubleshooting for DTC B2285 first. Refer to DTC B2285: Steering Lock Position Signal Circuit Malfunction .

    NG → GO TO DTC CHART 

    OK: Go to next step 

  2. 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 

  3. 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 

  4. 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
      GTY128700Courtesy 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 

  5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM) 
    1. Disconnect the A5 ECM connector.
      Fig 2: Identifying J55 Power Source Control ECU Connector
      GTY145604Courtesy 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
      J55-39 (STSW) - A5-19 (STSW) Always Below 1 Ω
      J55-39 (STSW) or A5-19 (STSW) - Body ground Always 10 kΩ or higher
    3. Reconnect the A5 ECM connector.
      Fig 3: Identifying STSW Terminal Of J55 ECU Connector
      GTY118686Courtesy 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
      J55-39 (STSW) - Body ground Always Below 1 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK WIRE HARNESS (STEERING LOCK ECU - POWER SOURCE CONTROL ECU AND BODY GROUND) 
    1. Disconnect the J29 ECU connector.
      Fig 4: Identifying J29 Steering Lock ECU Connectors
      GTY144232Courtesy 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
      J29-1 (GND) - Body ground Always Below 1 Ω
      J29-4 (SLP1) - J55-26 (SLP) Always Below 1 Ω
      J29-4 (SLP1) or J55-26 (SLP) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the J55 ECU connector.
      Fig 5: Identifying Terminal SLP Of J55 Power Source Control ECU Connector
      GTY138149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
      Fig 6: Waveform Graph
      GTY128541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal (Symbols) J55-26 (SLP) - Body ground
      Equipment Setting 2 V/DIV, 100 ms/DIV
      Condition Engine switch on (IG)

      OK

      The waveform appears as shown in the illustration.

      HINT: 

      The waveform varies depending on the contents of communication.

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK: Go to next step 

  8. INSPECT STEERING LOCK ECU 
    1. Reconnect the J29 ECU connector.
      Fig 7: Identifying Terminal SLP Of J55 Power Source Control ECU Connector
      GTY138149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
      Fig 8: Identifying Waveform
      GTY146537Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal (Symbols) J55-26 (SLP) - Body ground
      Equipment Setting 2 V/DIV, 100 ms/DIV
      Condition Steering is LOCK / UNLOCK

      OK

      The waveform appears as shown in the illustration.

      HINT: 

      The waveform varies depending on the contents of communication.

    NG → REPLACE STEERING LOCK ECU 

    OK: Go to next step 

  9. INSPECT POWER SOURCE CONTROL ECU 
    1. Disconnect the A5 ECM connector.
      Fig 9: Identifying J55 Power Source Control ECU Connector
      GTY137815Courtesy 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
      J55-39 (STSW) - Body ground Brake pedal (A/T) or clutch pedal (M/T) depressed, Engine switch off Below 1 V
      Brake pedal (A/T) or clutch pedal (M/T) depressed, Engine switch on (IG) 8 to 14 V

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK → REPLACE ECM 

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