Dtc B2275 Stsw Monitor Malfunction

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Starting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTCS

INSPECT FUSE (AM2)

CHECK CONNECTORS

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)

CHECK WIRE HARNESS (STEERING LOCK ECU - POWER SOURCE CONTROL ECU AND BODY GROUND)

INSPECT POWER SOURCE CONTROL ECU

INSPECT STEERING LOCK ECU

INSPECT POWER SOURCE CONTROL ECU

DTC B2275 STSW Monitor Malfunction


DESCRIPTION

This DTC is output when there is an open, short, or any other problem in the engine start request output circuit inside the power source control ECU or in the external circuit.
HINT:
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.
DTC Detection Condition
Trouble Area
B2275
ST output circuit (engine starting request signal circuit) inside power source control ECU or other related circuit is malfunctioning
  1. AM2 fuse
  2. ECM
  3. Steering lock ECU
  4. Power source control ECU
  5. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTCS

  1. Delete the DTC (Click here).

  1. After all DTCs are cleared, turn the engine switch on (IG). After 30 seconds have elapsed, check for DTCs again.

    OK:
    DTC B2285 is not output.
    HINT:
    If DTC B2285 is output, perform troubleshooting for DTC B2285 first (Click here).


NG
GO TO DTC CHART
OK


2.INSPECT FUSE (AM2)

  1. Remove the AM2 fuse from the cowl side J/B RH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


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


4.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Disconnect the J55 ECU connector.

  1. 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

  1. 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


5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Disconnect the A5 ECM connector.

  1. 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


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Reconnect the A5 ECM connector.

  1. 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


6.CHECK WIRE HARNESS (STEERING LOCK ECU - POWER SOURCE CONTROL ECU AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Disconnect the J29 ECU connector.

  1. 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


7.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Reconnect the J55 ECU connector.



    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.

    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.


NG
REPLACE POWER SOURCE CONTROL ECU
OK


8.INSPECT STEERING LOCK ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Reconnect the J29 ECU connector.



    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.

    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.


NG
REPLACE STEERING LOCK ECU
OK


9.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2275 Stsw Monitor Malfunction

  1. Disconnect the A5 ECM connector.

  1. 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 (Released)
    		Below 1 V
    Brake pedal (A/T) or clutch pedal (M/T) depressed, Engine switch on (IG) (hold on)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

REPLACE ECM