Unable to Lock Steering Wheel [03/2017 - ]: Procedure

1. Using the Techstream, confirm the output of DTCs for all systems.

   OK

   No DTCs are output.

   NOTE:

   • When using the Techstream with the engine switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
   • Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.

     Refer to DIAGNOSTIC TROUBLE CODE CHART [03/2017 - ]

Result: 

NG 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

Result: 

OK 

See step  2

1. Use the Data List to check if the steering lock command is functioning properly.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Lock Request Receive*1	Reception state of steering lock command signal determined by certification ECU (smart key ECU assembly) and sent to ID code box (immobiliser code ECU) / OK or NG HINT:  The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG"	OK: Within 10 seconds of opening any door with engine switch off and shift lever in P*3 NG: Except above	If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
   Lock Request Receive*2	Reception state of steering lock command signal determined by certification ECU (smart key ECU assembly) / OK or NG HINT:  The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG"	OK: Within 10 seconds of opening any door with engine switch off and shift lever in P*3 NG: Except above	If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

   • *1: w/ ID Code Box
   • *2: w/o ID Code Box
   • *3: for Automatic Transmission

   OK

   The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the engine switch from on (IG) to off and opening a door with the shift lever in P (for automatic transmission), and OK is displayed on the Techstream screen.

Result: 

NG 

See step  5

Result: 

OK 

See step  3

1. Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D59-1 (GND) - Body ground	Always	Below 1 Ω

3. Reconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
4. Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P*.
   • *: for Automatic Transmission
5. Check the signal waveform according to the condition(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   STANDARD FREQUENCY
   
   

   Item	Content
   Tester Connection	D59-3 (SLR+) - D59-1 (GND)
   Tool Setting	2 V/DIV., 200 ms./DIV.
   Vehicle Condition	Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock Actuator Assembly (Steering Lock ECU))
   *b	Steering lock motor not operating
   *c	Steering lock motor operating

   HINT: 

   • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.
   • In order to take measurements when the lock motor is operating, perform either of the following operations:
     • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG).
     • To lock the steering, turn the engine switch off with the shift lever is in P*, and then open a door.
       • *: for Automatic Transmission

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the D41 certification ECU (smart key ECU assembly) connector.
2. Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
3. Check for deformation and corrosion of the connector case and terminals.

   OK

   There is no deformation or corrosion of the connector case or terminals.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D41-29 (SLR+) - D59-3 (SLR+)	Always	Below 1 Ω
   D59-3 (SLR+) - Body ground	Always	10 kΩ or higher
   D41-29 (SLR+) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU). Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Using the Techstream, check the following main body ECU (network gateway ECU) Data List item by opening and closing the driver door to confirm the state of the driver side door courtesy light switch.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   D Door Courtesy SW	Driver side door courtesy switch / ON or OFF	ON: Driver side door open OFF: Driver side door closed	If this item does not change according to the actual state of the driver side door, there is a malfunction in the door courtesy light switch or related part.

   OK

   The Data List item changes in accordance with the opening and closing of the driver side door.

   Result

   Result	Proceed to
   OK (w/o ID Code Box)	A
   OK (w/ ID Code Box)	B
   NG	C

Result: 

B 

See step  9

Result: 

C 

GO TO LIGHTING SYSTEM (FRONT DOOR COURTESY SWITCH CIRCUIT). Refer to  Door Courtesy Switch Circuit [06/2016 - ] 

Result: 

A 

See step  6

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

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between certification ECU (smart key ECU assembly) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is not registered or the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK is displayed on the Techstream.

   HINT: 

   Reasons for verification failure:

   • The steering lock actuator assembly (steering lock ECU) or certification ECU (smart key ECU assembly) is malfunctioning.
   • There is a problem with the communication between ECUs.
   • An ECU is replaced, but is not registered.
   • An ECU is replaced with an ECU which has a code already stored in it.

Result: 

NG 

See step  8

Result: 

OK 

See step  7

1. Replace the steering lock actuator assembly (steering lock ECU) with a new one.

   Refer to DISASSEMBLY [03/2017 - ]

2. Perform registration.

   Refer to REGISTRATION [03/2017 - 12/2017] Refer to REGISTRATION [12/2017 - ]

3. Turn the engine switch on (IG).
4. Turn the steering wheel and check the steering condition.

   OK

   Steering is unlocked.

Result: 

OK 

END 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ] 

1. Replace the certification ECU (smart key ECU assembly) with a new one.

   Refer to REMOVAL [03/2017 - ]

2. Perform registration.

   Refer to REGISTRATION [03/2017 - 12/2017] Refer to REGISTRATION [12/2017 - ]

3. Use the Data List to check if L code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between certification ECU (smart key ECU assembly) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is not registered or the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK is displayed on the Techstream.

Result: 

OK 

END 

Result: 

NG 

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU). Refer to  DISASSEMBLY [03/2017 - ] 

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

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is not registered or the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK is displayed on the Techstream.

   HINT: 

   Reasons for verification failure:

   • The certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
   • There is a problem with the communication between ECUs.
   • An ECU is replaced, but is not registered.
   • An ECU is replaced with an ECU which has a code already stored in it.

Result: 

NG 

See step  12

Result: 

OK 

See step  10

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

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between ID code box (immobiliser code ECU) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is not registered or the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK is displayed on the Techstream.

   HINT: 

   Reasons for verification failure:

   • The steering lock actuator assembly (steering lock ECU) or ID code box (immobiliser code ECU) is malfunctioning.
   • There is a problem with the communication between ECUs.
   • An ECU is replaced, but is not registered.
   • An ECU is replaced with an ECU which has a code already stored in it.

Result: 

NG 

See step  13

Result: 

OK 

See step  11

1. Replace the steering lock actuator assembly (steering lock ECU) with a new one.

   Refer to DISASSEMBLY [03/2017 - ]

2. Perform registration.

   Refer to REGISTRATION [03/2017 - 12/2017] Refer to REGISTRATION [12/2017 - ]

3. Turn the engine switch on (IG).
4. Turn the steering wheel and check the steering condition.

   OK

   Steering is unlocked.

Result: 

OK 

END 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ] 

1. Replace the certification ECU (smart key ECU assembly) with a new one.

   Refer to REMOVAL [03/2017 - ]

2. Perform registration.

   Refer to REGISTRATION [03/2017 - 12/2017] Refer to REGISTRATION [12/2017 - ]

3. Use the Data List to check if S code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is not registered or the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK is displayed on the Techstream.

Result: 

OK 

END 

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [03/2017 - ] 

1. Replace the steering lock actuator assembly (steering lock ECU) with a new one.

   Refer to DISASSEMBLY [03/2017 - ]

2. Perform registration.

   Refer to REGISTRATION [03/2017 - 12/2017] Refer to REGISTRATION [12/2017 - ]

3. Use the Data List to check if L code certification is functioning properly again.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between ID code box (immobiliser code ECU) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is not registered or the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

   OK

   OK is displayed on the Techstream.

Result: 

OK 

END 

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [03/2017 - ]