Steering Lock does not Lock [06/2018 - 09/2022]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Access / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Lock Request Receive	Status of steering lock command from certification ECU (smart key ECU assembly)	OK or NG	OK: Certification ECU (smart key ECU assembly) sends steering lock command (within 10 seconds of any door opened with shift lever in P and engine switch off) NG: Certification ECU (smart key ECU assembly) does not send steering lock command (no door opened with shift lever in P and engine switch off)	If OK is not displayed even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

   Body Electrical > Smart Access > Data List 

   Tester Display
   Lock Request Receive

   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 on (ACC) or off and opening a door with the shift lever in P, and OK is displayed on the Techstream screen.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  10

Result: 

OK 

See step  2

1. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

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

   Body Electrical > Smart Access > Data List 

   Tester Display
   S Code Check

   OK

   OK is displayed on the Techstream.

   HINT: 

   Reasons for verification failure:

   • The certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is malfunctioning.
   • There is a problem with the communication between ECUs.
   • An ECU was replaced, but not registered.
   • An ECU was replaced with an ECU which has already been registered to another vehicle.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  9

Result: 

OK 

See step  3

1. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

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

   Body Electrical > Smart Access > Data List 

   Tester Display
   L Code Check

   OK

   OK is displayed on the Techstream.

   HINT: 

   Reasons for verification failure:

   • The steering lock ECU (steering lock actuator or upper bracket assembly) 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

   Proceed to
   OK
   NG

Result: 

NG 

See step  8

Result: 

OK 

See step  4

1. Disconnect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Measure the resistance and voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G51-1 (GND) - Body ground	Always	Below 1 Ω

   NOTE:

   If the result is not as specified, check for looseness in the ground cable connection.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G51-7 (B) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Connect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Move the shift lever to P and turn the engine switch off.
3. Check the signal waveform according to the condition(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))	*b	Steering lock motor not operating
   *c	Steering lock motor operating	*d	Waveform

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   G51-3 (IGE) - G51-1 (GND)	2 V/DIV., 200 ms./DIV.	Steering lock motor not operating → Operating → Not operating	Pulse generation (See waveform)

   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 electrical key transmitter sub-assembly and turn the engine switch on (ACC) or on (IG).
     • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 

for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - 09/2022]

for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - ]

Result: 

NG 

See step  6

1. Disconnect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Disconnect the G47 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G51-3 (IGE) - G47-25 (SLR+)	Always	Below 1 Ω
   G51-3 (IGE) or G47-25 (SLR+) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Connect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Connect the G47 certification ECU (smart key ECU assembly) connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G51-3 (IGE) - Body ground	Always	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 

for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - 09/2022]

for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - ]

1. Replace the steering lock ECU (steering lock actuator or upper bracket assembly) with a new one and perform registration.

   for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - 09/2022]

   for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - ]

2. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

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

   Body Electrical > Smart Access > Data List 

   Tester Display
   L Code Check

   OK

   OK is displayed on the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE) 

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

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

   Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022]

2. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

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

   Body Electrical > Smart Access > Data List 

   Tester Display
   S Code Check

   OK

   OK is displayed on the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) 

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Using the Techstream, check the following main body ECU (multiplex network body ECU) Data List item by opening and closing the driver door to confirm the state of the front door courtesy light switch assembly.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   FL Door Courtesy SW	Front door LH courtesy light switch signal	OFF or ON	OFF: Front door LH closed ON: Front door LH open	-

   Body Electrical > Main Body > Data List 

   Tester Display
   FL Door Courtesy SW

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit). Refer to  Front Door Courtesy Switch Circuit [06/2018 - ] 

Result: 

OK 

See step  11

1. Move the shift lever to P.
2. Read the Data List according to the display on the Techstream.

   Body Electrical > Power Source Control > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Shift P Signal	Shift position P	OFF or ON	OFF: Shift lever not in P ON: Shift lever in P	Use this item to determine if the park/neutral position switch assembly is malfunctioning.

   Body Electrical > Power Source Control > Data List 

   Tester Display
   Shift P Signal

   OK

   ON is displayed on the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO OTHER PROBLEM. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 09/2022] 

Result: 

OK 

See step  12

1. Check that the steering is unlocked.
2. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Steering Lock	Steering lock ECU (steering lock actuator or upper bracket assembly) lock confirmation status	Unset or Set	Unset: Lock not confirmed Set: Lock confirmed	When Unset is displayed, the steering is not locked.

   Body Electrical > Smart Access > Data List 

   Tester Display
   Steering Lock

   OK

   Set is displayed on the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 

for Manual Tilt and Manual Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - 09/2022]

for Power Tilt and Power Telescopic Steering Column: Refer to DISASSEMBLY [06/2018 - ]

Result: 

OK 

See step  13

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

   Refer to REGISTRATION [06/2018 - 10/2019] , or refer to REGISTRATION [10/2019 - 08/2020] , or refer to REGISTRATION [08/2020 - 09/2022]

2. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Lock Request Receive	Status of steering unlock command from certification ECU (smart key ECU assembly)	OK or NG	OK: Certification ECU (smart key ECU assembly) sends steering lock command (within 10 seconds of any door opened with shift lever in P and engine switch off) NG: Certification ECU (smart key ECU assembly) does not send steering lock command (no door opened with shift lever in P and engine switch off)	If OK is not displayed even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

   Body Electrical > Smart Access > Data List 

   Tester Display
   Lock Request Receive

   OK

   Within 10 seconds after any of the doors is opened with shift lever in P and engine switch off, the Data List item changes to "OK".

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022] 

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]