Steering Lock System Steering Lock Motor Drive Power Circuit

Steering. Corolla. Zre142 Aze141
Steering Column. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK VEHICLE CONDITION

READ VALUE USING TECHSTREAM

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 - MAIN BODY ECU)

INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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

STEERING LOCK SYSTEM - Steering Lock Motor Drive Power Circuit


DESCRIPTION

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

WIRING DIAGRAM


Corolla. Zre142 Aze141.Steering Column.Steering Lock System.Steering Lock System 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 USING TECHSTREAM

  1. Turn the engine switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the Techstream on.

  1. Enter the following menus: Body Electrical / Smart Key / Data List.

  1. Select the item below in the Data List, and read its value displayed on the Techstream.

    Smart Key
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Lck/Unlck Rec
    		Steering lock command reception record / YES or NO
    		YES: Steering lock/unlock signal received
    NO: Steering lock/unlock signal not received
    		-

  1. Check if a steering unlock command signal has been received.

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


NG
CHECK SMART KEY SYSTEM (for Start Function) (COROLLA_ZRE142 RM000000YEF0FXX.html)
OK


3.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System.Steering Lock System Steering Lock Motor Drive Power Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E39-3 (IGE) - E39-1 (GND)
    1. Engine switch off
    2. Engine switch on (ACC or IG)
    1. Motor activated: Below 1 V
    2. Motor not activated:
      11 to 14 V


NG
Go to step 4
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000000XWP060X.html)

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


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System.Steering Lock System Steering Lock Motor Drive Power Circuit

  1. Disconnect the E39 connector from the steering lock actuator assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E39-1 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU)


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System.Steering Lock System Steering Lock Motor Drive Power Circuit

  1. Disconnect the E50 connector from the main body ECU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E39-3 (IGE) - E50-7 (SLR+)
    		Always
    		Below 1 Ω
    E39-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU

6.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System.Steering Lock System Steering Lock Motor Drive Power Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E39-3 (IGE) - E39-1 (GND)
    		The specified condition should be checked after performing the following:
    1. Move the shift lever to neutral
    2. Turn the engine switch off
    3. Open the driver's door
    1. Motor activated: Below 1 V
    2. Motor not activated:
      11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU)


    Corolla. Zre142 Aze141.Steering Column.Steering Lock System.Steering Lock System Steering Lock Motor Drive Power Circuit

  1. Disconnect the E39 connector from the steering lock actuator assembly.

  1. Disconnect the E50 connector from the main body ECU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E39-3 (IGE) - E50-7 (SLR+)
    		Always
    		Below 1 Ω
    E39-3 (IGE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU