Lexus IS250 IS220d GSE20 ALE20 - STEERING COLUMN

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK VEHICLE CONDITION

READ VALUE OF INTELLIGENT TESTER

INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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 (STEERING LOCK ECU)

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


WIRING DIAGRAM

Electric Steering Lock - Steering Lock Motor Drive Power Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK VEHICLE CONDITION

Check the problem symptom of the steering lock system.

  • Result:
  • ConditionProceed to
    Steering lock cannot be releasedA
    Steering cannot be lockedB
B
Go to step 6
A
2.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

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

Select the item below in the DATA LIST, and read its value displayed on the intelligent tester.

Entry & Start:
ItemMeasurement Item / Range (Display)Normal Condition
Lock/Unlock ReceiveSteering lock command reception record/YES or NOYES: Steering lock/unlock signal received
NO: Steering lock/unlock signal not received

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 (STEERING LOCK ECU)
Electric Steering Lock - Steering Lock Motor Drive Power Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard voltage:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    J29-3 (IGE) - J29-1 (GND)
    Engine switch off
    Turn the engine switch on (ACC or IG)
    Motor activated: Below 1 V
    Motor not activated:
    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)
Electric Steering Lock - Steering Lock Motor Drive Power Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J29 connector from the steering lock actuator assembly.

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
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - POWER SOURCE CONTROL ECU)
Electric Steering Lock - Steering Lock Motor Drive Power Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J55 connector from the power source control ECU.

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

  • Standard resistance:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    J29-3 (IGE) - J55-32 (SLR+)AlwaysBelow 1 Ω
    J29-3 (IGE) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE POWER SOURCE CONTROL ECU
6.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
Electric Steering Lock - Steering Lock Motor Drive Power Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard voltage:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    J29-3 (IGE) - J29-1 (GND)Specified condition is checked after performing the following:
    Shift the shift lever to the P position
    Turn the engine switch off
    Open the driver's door
    Motor activated: Below 1 V
    Motor not activated:
    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)
Electric Steering Lock - Steering Lock Motor Drive Power Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J29 connector from the steering lock actuator assembly.

Disconnect the J55 connector from the power source control ECU.

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

  • Standard resistance:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    J29-3 (IGE) - J55-32 (SLR+)AlwaysBelow 1 Ω
    J29-3 (IGE) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE POWER SOURCE CONTROL ECU
LEXUS IS250, IS220d / GSE20 ALE20
STEERING COLUMN
Lexus IS250 IS220d GSE20 ALE20
ELECTRIC STEERING LOCK