STEERING LOCK SYSTEM Steering Lock Motor Drive Power Circuit

DESCRIPTION

The steering lock ECU is connected to the main body ECU and certification ECU (smart key ECU assembly). 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

INSPECTION PROCEDURE

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

   INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

   A

2. READ VALUE USING INTELLIGENT TESTER

   
   

   1. Turn the engine switch off.

   2. Connect the intelligent tester to the DLC3.

   3. Turn the engine switch on (IG).

   4. Turn the intelligent tester on.

   5. Enter the following menus: Body / Entry & Start / Data List.

   6. Select the item below in the Data List, and read its value displayed on the intelligent tester.

      Entry & Start:

      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	-

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

      OK
      "YES" is displayed on the tester display.

   
   

   NG

   CHECK SMART ENTRY AND START SYSTEM Click here

   OK

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

   
   

   1. 

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition D10-3 (IGE) - D10-1 (GND) Engine switch off Engine switch on (ACC or IG) Motor activated: Below 1 V Motor not activated: 11 to 14 V

   
   

   NG

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

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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

   
   

   1. 

      Disconnect the D10 connector from the steering lock actuator assembly.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition D10-1 (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)

   
   

   1. 

      Disconnect the D7 connector from the main body ECU.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition D10-3 (IGE) - D7-19 (SLR+) Always Below 1 Ω D10-3 (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)

   
   

   1. 

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

      Standard voltage
      Tester Connection Condition Specified Condition D10-3 (IGE) - D10-1 (GND) The specified condition should be checked after performing the following: Move the shift lever to the N position Turn the engine switch off Open the driver's door Motor activated: Below 1 V Motor not activated: 11 to 14 V

   
   

   NG

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

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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

   
   

   1. 

      Disconnect the D10 connector from the steering lock actuator assembly.

   2. Disconnect the D7 connector from the main body ECU.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition D10-3 (IGE) - D7-19 (SLR+) Always Below 1 Ω D10-3 (IGE) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU