Unable to Unlock Steering Wheel: Procedure

1. Check the power source mode change.
   1. When the key is inside the vehicle and the shift lever is in P, check that pressing the engine switch causes the power source mode to change as follows:

      OK

      off → on (ACC) → on (IG) → off

NG → See step   15 

OK: Go to next step 

1. Check the DTCs of the main body ECU by following the prompts displayed on the Techstream screen. Refer to DTC CHECK/CLEAR .

   OK

   No DTCs related to main body ECU are output.

NG → See step   16 

OK: Go to next step 

1. Check the DTCs of the certification ECU by following the prompts displayed on the Techstream screen. Refer to DTC CHECK/CLEAR .

   OK

   No DTCs related to certification ECU are output.

NG → See step   17 

OK: Go to next step 

1. Within 10 seconds of the engine switch being turned on (IG), check the Data List and read the value displayed on the Techstream screen.
   SMART ACCESS
   
   

   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   7 

OK: Go to next step 

1. Disconnect the L33 steering lock ECU connector.
2. Measure the resistance and voltage according to the value(s) in the table below.
   Fig 1: Identifying L33 Steering Lock ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L33-7 (B) - L33-1 (GND)	Always	11 to 14 V
   L33-7 (B) - L33-2 (SGND)	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L33-1 (GND) - Body ground	Always	Below 1 Ω
   L33-2 (SGND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Move the shift lever to P.
2. Immediately after turning the engine switch on (IG), inspect the voltage between terminals 3 (IGE) and 2 (SGND) of the steering lock ECU.
   Fig 2: Identifying Steering Lock ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   RESULT
   
   

   Result	Proceed to
   Measurement is 11 to 14 V, and measurement never becomes 1 V or less	A
   Immediately after turning engine switch on (IG), measurement is 1 V or less (w/ VGRS)	B
   Immediately after turning engine switch on (IG), measurement is 1 V or less (w/o VGRS)	C

B → See step   18 

C → See step   19 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Use the Data List to check if the S code certification is functioning properly.
   SMART ACCESS
   
   

   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.

NG → See step   11 

OK: Go to next step 

1. Use the Data List to check if the L code certification is functioning properly.
   SMART ACCESS
   
   

   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.

NG → See step   13 

OK: Go to next step 

1. Replace the steering lock actuator assembly (steering lock ECU) (See reference w/ VGRS: Refer to REMOVAL , w/o VGRS: Refer to REMOVAL ).

NEXT: Go to next step 

1. Turn the engine switch on (IG).
2. Operate the steering wheel and check the steering lock condition.

   OK

   Steering lock is released.

NG → REPLACE CERTIFICATION ECU 

OK → END (STEERING LOCK ECU IS DEFECTIVE) 

1. Replace the ID code box.

NEXT: Go to next step 

1. Use the Data List to check if the S code certification is functioning properly.
   SMART ACCESS
   
   

   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.

NG → REPLACE CERTIFICATION ECU 

OK → END (ID CODE BOX IS DEFECTIVE) 

1. Replace the ID code box.

NEXT: Go to next step 

1. Use the Data List to check if the L code certification is functioning properly.
   SMART ACCESS
   
   

   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.

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (w/ VGRS)	B
   NG (w/o VGRS)	C

B → See step   18 

C → See step   19 

A → END (ID CODE BOX IS DEFECTIVE)