Unable to Lock Steering Wheel: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Read the DTCs of the certification ECU (ECU aggregation box assembly) by following the prompts displayed on the Techstream screen.

   OK

   No DTCs related to the certification ECU (ECU aggregation box assembly) are output.

NG → GO TO RELEVANT DTC 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Read the DTCs of the main body ECU by following the prompts displayed on the Techstream screen.

   OK

   No DTCs related to the main body ECU are output.

NG → GO TO RELEVANT DTC 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Within 10 seconds after the EV system is started, read the Data List menu of the certification ECU (ECU aggregation box assembly), and check the steering lock command reception record.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   Lock/Unlock Receive	Steering lock command reception record/Yes or No	Yes: Steering lock/unlock signal received No: Steering lock/unlock signal not received	-

   OK

   Yes is displayed on the Techstream screen.

NG → See step   5 

OK: Go to next step 

Fig 1: Steering Lock ECU Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the power switch on (IG).
2. Turn the power switch off.
3. With park (P) selected, immediately after opening the driver door, inspect the voltage between terminals 3 (IGE) and 2 (SGND) of the steering lock ECU.
   RESULT
   
   

   Result	Proceed to
   Immediately after opening door, measurement is below 1 V.	A
   Measurement is 11 to 14 V, and measurement never becomes below 1 V.	B

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))

B → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → See step   14 

1. Open the front passenger side door.
2. Lock the doors using the wireless remote door lock key.
3. Check that no doors are locked and the steering lock does not operate.

   OK

   No doors are locked and steering lock is not locked.

NG → See step   11 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   S Code Check	S code match record/NG or OK	NG: S code not matched OK: S code matched	-

   RESULT
   
   

   Result	Proceed to
   NG is displayed on the Techstream screen.	A
   OK is displayed on the Techstream screen.	B

B → See step   8 

A: Go to next step 

1. Replace the certification ECU (ECU aggregation box assembly) with a new one. Refer to REMOVAL .
   NOTE:

   When replacing the certification ECU (ECU aggregation box assembly), registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and turn the Techstream on.
4. Check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   S Code Check	S code match record/NG or OK	NG: S code not matched OK: S code matched	-

   OK

   OK is displayed on the Techstream screen.

NG → See step   12 

OK → END 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   L Code Check	L code match record/NG or OK	NG: L code not matched OK: L code matched	-

   RESULT
   
   

   Result	Proceed to
   NG is displayed on the Techstream screen.	A
   OK is displayed on the Techstream screen.	B

B → See step   10 

A: Go to next step 

1. Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to DISASSEMBLY .
   NOTE:

   When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and turn the Techstream on.
4. Check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   L Code Check	L code match record/NG or OK	NG: L code not matched OK: L code matched	-

   OK

   OK is displayed on the Techstream screen.

NG → See step   13 

OK → END 

1. Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to DISASSEMBLY .
   NOTE:

   When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. With park (P) selected and the brake pedal depressed, turn the power switch on (IG).
3. Check whether the steering lock can be released by turning the steering wheel, and check that the EV system starts.

   OK

   Steering lock is released and EV system starts.

NG → See step   15 

OK → END