Lexus IS250 IS220d GSE20 ALE20 2AD-FHV STARTING

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 ConditionTrouble Area
B2275 ST output circuit (engine starting request signal circuit) inside power source control ECU or other related circuit is malfunctioning
AM2 fuse
ECM
Steering lock ECU
Power source control ECU
Wire harness or connector

WIRING DIAGRAM

Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK FOR DTCS

Delete the DTC .

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 .
NG
GO TO DTC CHART
OK
2.INSPECT FUSE (AM2)

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

Measure the resistance of the fuse.

  • Standard resistance:
  • Below 1 Ω
NG
REPLACE FUSE
OK
3.CHECK CONNECTORS

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)
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J55 ECU connector.

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-33 (AM1) - Body groundAlways10 to 14 V
    J55-12 (AM2) - Body groundAlways10 to 14 V

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-6 (GND2) - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the A49 ECM connector.

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-39 (STSW) - A49-9 (STSW)AlwaysBelow 1 Ω
    J55-39 (STSW) or A49-9 (STSW) - Body groundAlways10 kΩ or higher
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the A49 ECM connector.

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-39 (STSW) - Body groundAlwaysBelow 1 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
6.CHECK WIRE HARNESS (STEERING LOCK ECU - POWER SOURCE CONTROL ECU AND BODY GROUND)
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J29 ECU connector.

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J29-1 (GND) - Body groundAlwaysBelow 1 Ω
    J29-4 (SLP1) - J55-26 (SLP)AlwaysBelow 1 Ω
    J29-4 (SLP1) or J55-26 (SLP) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
7.INSPECT POWER SOURCE CONTROL ECU
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the J55 ECU connector.

Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

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

ItemContents
Terminal (Symbols)J55-26 (SLP) - Body ground
Equipment Setting2 V/DIV., 100 ms./DIV.
ConditionEngine switch on (IG)
  • OK:
  • The waveform appears as shown in the illustration.
NG
REPLACE POWER SOURCE CONTROL ECU
OK
8.INSPECT STEERING LOCK ECU
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the J29 ECU connector.

Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

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

ItemContents
Terminal (Symbols)J55-26 (SLP) - Body ground
Equipment Setting2 V/DIV., 100 ms./DIV.
ConditionSteering is LOCK / UNLOCK
  • OK:
  • The waveform appears as shown in the illustration.
NG
REPLACE STEERING LOCK ECU
OK
9.INSPECT POWER SOURCE CONTROL ECU
Dtc B2275 Stsw Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the A49 ECM connector.

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-39 (STSW) - Body groundClutch pedal depressed, Engine switch off (Released)Below 1 V
    Clutch pedal 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
LEXUS IS250, IS220d / GSE20 ALE20
2AD-FHV STARTING
Lexus IS250 IS220d GSE20 ALE20
ENTRY AND START SYSTEM