Dtc B2288 Steering Lock Signal Circuit Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTCS

CHECK CONNECTORS

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

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

INSPECT POWER SOURCE CONTROL ECU

INSPECT STEERING LOCK ECU

RECHECK FOR DTC

DTC B2288 Steering Lock Signal Circuit Malfunction


DESCRIPTION

This DTC is output when the power source control ECU cannot detect the unlock condition of the steering lock within a specified time.
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
B2288
After turning engine switch from off to on (IG), the steering wheel does not unlock for a certain period of time (ECU unlocks steering wheel only when it receives an unlock signal from LIN communication and cable)
  1. Power source control ECU
  2. Steering lock ECU
  3. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTCS

  1. Delete the DTC (Click here).

  1. Check for DTCs again.

    OK:
    DTC B2785, DTC B2287 and DTC B2781 are not output.
    HINT:
    1. If DTC B2785 is output (Click here).
    2. If DTC B2287 is output (Click here).
    3. If DTC B2781 is output (Click here).


NG
GO TO DTC CHART
OK


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


3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit Malfunction

  1. Disconnect the J55 ECU connector.

  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


4.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit Malfunction

  1. Disconnect the J29 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J55-26 (SLP) - J29-4 (SLP1)
    		Always
    		Below 1 Ω
    J55-32 (SLR+) - J29-3 (IGE)
    		Always
    		Below 1 Ω
    J55-30 (LIN1) - J29-5 (LIN)
    		Always
    		Below 1 Ω
    J29-2 (SGND) - Body ground
    		Always
    		Below 1 Ω
    J29-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    J55-26 (SLP) or J29-4 (SLP1) - Body ground
    		Always
    		10 kΩ or higher
    J55-32 (SLR+) or J29-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher
    J55-30 (LIN1) or J29-5 (LIN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit Malfunction

  1. Reconnect the J55 ECU connector.



    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit 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


6.INSPECT STEERING LOCK ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit Malfunction

  1. Reconnect the J29 ECU connector.



    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2288 Steering Lock Signal Circuit 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


7.RECHECK FOR DTC

  1. Delete the DTCs (Click here).

  1. After DTCs are all cleared, check if the trouble occurs again 30 seconds after the engine switch is turned on (IG) and brake (A/T) or clutch (M/T) pedal depressed.

    OK:
    DTC B2288 is not output.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

REPLACE STEERING LOCK ECU