Unable to Unlock Steering Wheel (Engine cannot Start) [12/2015 - ]: 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

Result: 

NG 

GO TO SMART KEY SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) 

(Refer to PROBLEM SYMPTOMS TABLE [12/2015 - 08/2016] , or refer to PROBLEM SYMPTOMS TABLE [08/2016 - ] )

Result: 

OK 

See step  2

1. Use the Data List to check if the steering lock control is functioning properly (Refer to DATA LIST / ACTIVE TEST [12/2015 - ] ).
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Unlock Request Receive	Steering lock unlock command reception status/NG or OK	NG: Unlock request not received OK: Unlock request received	-

   OK

   The certification ECU receives an unlock request signal within 10 seconds of starting the engine, and OK is displayed on the Techstream screen.

Result: 

NG 

See step  6

Result: 

OK 

See step  3

1. Disconnect the D29 steering lock ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D29-1 (GND) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D29-7 (B) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Steering Lock ECU)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Reconnect the D29 steering lock ECU connector.
2. Move the shift lever to P.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D29-3 (IGE) - D29-1 (GND)	Steering lock motor operating immediately after turning engine switch from off to on (IG)	Below 1 V
   D29-3 (IGE) - D29-1 (GND)	Steering lock motor not operating	11 to 14 V

   HINT: 

   When the steering lock is locked and the engine switch is turned on (IG), the steering lock motor activates to release the steering lock. The motor operates for 2 to 15 seconds.

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU)

Result: 

OK 

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) 

(Refer to DISASSEMBLY [12/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Use the Data List to check if the steering lock control is functioning properly (Refer to DATA LIST / ACTIVE TEST [12/2015 - ] ).
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	S code certification result/NG or OK	OK: S code certification result normal NG: S code certification result abnormal	-

   OK

   OK is displayed on the Techstream.

Result: 

NG 

REPLACE CERTIFICATION ECU 

(Refer to REMOVAL [12/2015 - 11/2017] , or refer to REMOVAL [11/2017 - ] )

Result: 

OK 

See step  7

1. Use the Data List to check if the steering lock control is functioning properly (Refer to DATA LIST / ACTIVE TEST [12/2015 - ] ).
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	L code certification result/NG or OK	OK: L code certification result normal NG: L code certification result abnormal	-

   OK

   OK is displayed on the Techstream.

Result: 

NG 

See step  10

Result: 

OK 

See step  8

1. Replace the steering lock actuator assembly (steering lock ECU) (Refer to DISASSEMBLY [12/2015 - ] ).

Result: 

NEXT 

See step  9

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

   OK

   Steering lock is released.

Result: 

OK 

END (STEERING LOCK ECU IS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU 

(Refer to REMOVAL [12/2015 - 11/2017] , or refer to REMOVAL [11/2017 - ] )

1. Replace the certification ECU (Refer to REMOVAL [12/2015 - 11/2017] , or refer to REMOVAL [11/2017 - ] ).

Result: 

NEXT 

See step  11

1. Use the Data List to check if the steering lock control is functioning properly (Refer to DATA LIST / ACTIVE TEST [12/2015 - ] ).
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	L code certification result/NG or OK	OK: L code certification result normal NG: L code certification result abnormal	-

   OK

   OK is displayed on the Techstream.

Result: 

OK 

END (CERTIFICATION ECU IS DEFECTIVE) 

Result: 

NG 

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) 

(Refer to DISASSEMBLY [12/2015 - ] )