Electric Steering Lock Steering Lock Motor Drive Power Circuit

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Steering Column. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK VEHICLE CONDITION

READ VALUE OF INTELLIGENT TESTER

INSPECT STEERING LOCK ACTUATOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)

INSPECT STEERING LOCK ACTUATOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)

ELECTRIC STEERING LOCK - Steering Lock Motor Drive Power Circuit


DESCRIPTION

The steering lock ECU is connected to the power source control ECU assembly and certification ECU. The steering lock ECU cannot activate the motor unless it obtains permission from both the ECUs. (The power source control ECU assembly permits the steering lock ECU to supply power to activate the motor.)

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Electric Steering Lock Steering Lock Motor Drive Power Circuit


INSPECTION PROCEDURE

1.CHECK VEHICLE CONDITION

  1. Check the problem symptom of the steering lock system.

    Result:

    Condition
    		Proceed to
    Steering lock cannot be released
    		A
    Steering cannot be locked
    		B


B
Go to step 6
A


2.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG), and turn the intelligent tester on.

  1. Select the item below in the data list, and read its value displayed on the intelligent tester.

    Certification ECU:

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    Lock/Unlock Receive
    		Steering lock command reception record/YES or NO
    		YES: Steering lock/unlock signal received
    NO: Steering lock/unlock signal no received

  1. Check if steering unlock command reception is confirmed.

    OK:
    "YES" is displayed on the tester display.


NG
CHECK ENTRY AND START SYSTEM
OK


3.INSPECT STEERING LOCK ACTUATOR ASSEMBLY


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Electric Steering Lock Steering Lock Motor Drive Power Circuit

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-3 (IGE) - L28-2 (SGND)
    1. Engine switch off
    2. Turn the engine switch on (ACC or IG)
    1. Motor active: Below 1 V
    2. Motor not active:
      10 to 12 V


OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG


4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Electric Steering Lock Steering Lock Motor Drive Power Circuit

  1. Disconnect the L28 connector from the steering lock actuator assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-2 (SGND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Electric Steering Lock Steering Lock Motor Drive Power Circuit

  1. Disconnect the L73 connector from the power source control ECU assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-3 (IGE) - L73-32 (SLR+)
    		Always
    		Below 1 Ω
    L28-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU ASSEMBLY

6.INSPECT STEERING LOCK ACTUATOR ASSEMBLY


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Electric Steering Lock Steering Lock Motor Drive Power Circuit

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-3 (IGE) - L28-2 (SGND)
    1. Adjust the shift lever to the P position
    2. Turn the engine switch off
    3. Open the driver's door
    1. Motor active: Below 1 V
    2. Motor not active:
      10 to 12 V


OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG


7.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System.Electric Steering Lock Steering Lock Motor Drive Power Circuit

  1. Disconnect the L28 connector from the steering lock actuator assembly.

  1. Disconnect the L73 connector from the power source control ECU assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-3 (IGE) - L73-32 (SLR+)
    		Always
    		Below 1 Ω
    L28-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU ASSEMBLY