Toyota Yaris: Smart Key System (for Start Function) / Steering Lock does not Lock

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Steering Lock does not Lock

DESCRIPTION

The steering lock ECU (steering lock actuator or upper bracket assembly) activates the steering lock motor and moves the lock bar into the steering column to lock the steering.

When the steering lock is operating, the steering may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering can be locked by turning the steering wheel a little, as is done for a vehicle with a mechanical key, to change the position of the lock hole.

Related Data List and Active Test Items

Problem Symptom

Data List and Active Test

Steering Lock does not Lock
Smart Key
  • Steering Lock Request Receive
  • L Code Check
  • S Code Check
Main Body
  • FR Door Courtesy Switch Status
  • FL Door Courtesy Switch Status
  • RR Door Courtesy Switch Status
  • RL Door Courtesy Switch Status

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • Perform either of the following operations to lock/unlock the steering:
    • To unlock the steering, carry the electrical key transmitter sub-assembly and turn the ignition switch to ACC or ON.
    • To lock the steering, turn the ignition switch off and then open a door.
  • Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the steering lock ECU (steering lock actuator or upper bracket assembly) or certification ECU (smart key ECU assembly), refer to Registration.

    Click here

  • After performing repairs, confirm that the problem does not recur.
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

READ VALUE USING GTS (STEERING LOCK REQUEST RECEIVE)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering 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 ignition switch off)

NG: Certification ECU (smart key ECU assembly) does not send steering lock command (no door opened with ignition 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 Key > Data List

Tester Display

Steering Lock Request Receive

OK:

The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the ignition switch from ON to ACC or off and opening a door and OK is displayed on the GTS screen.

NG

GO TO STEP 10

OK

2.

READ VALUE USING GTS (S CODE CHECK)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > 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 (immobiliser code ECU) is not registered, or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
  • The steering cannot be locked.
  • The steering cannot be unlocked (the engine cannot be started).
Body Electrical > Smart Key > Data List

Tester Display

S Code Check

OK:

OK is displayed on the GTS.

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.
NG

GO TO STEP 9

OK

3.

READ VALUE USING GTS (L CODE CHECK)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

L Code Check

Verification result between ID code box (immobiliser 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 (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is not registered, or the ID code box (immobiliser 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 Key > Data List

Tester Display

L Code Check

OK:

OK is displayed on the GTS.

HINT:

Reasons for verification failure:

  • The steering lock ECU (steering lock actuator or upper bracket 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.
NG

GO TO STEP 8

OK

4.

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H71-1 (GND) - Body ground

Always

Below 1 Ω

NOTICE:

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

*a

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H71-7 (B) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

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

(a) Connect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) Check the signal waveform according to the condition(s) in the table below.

Measurement Condition

Item

Content

Tester Connection

H71-3 (IGE) - H71-1 (GND)

Tool Setting

2 V/DIV., 200 ms./DIV.

Condition

Steering lock motor operating when all conditions met, and then door opened:

  • Steering unlocked
  • Ignition switch turned off

*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
OK

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

NG

6.

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) Disconnect the H46 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H71-3 (IGE) - H46-24 (SLR+)

Always

Below 1 Ω

H71-3 (IGE) or H46-24 (SLR+) - Other terminals and body ground

Always

10 kΩ or higher

(d) Reconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(e) Reconnect the H46 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

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

(a) Connect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H71-3 (IGE) - Body ground

Ignition switch off

11 to 14 V

*a

Component with harness connected

(Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

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

8.

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

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

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

(b) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

L Code Check

Verification result between ID code box (immobiliser 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 (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is not registered, or the ID code box (immobiliser 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 Key > Data List

Tester Display

L Code Check

OK:

OK is displayed on the GTS.

OK

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

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

9.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

(b) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > 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 (immobiliser code ECU) is not registered, or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
  • The steering cannot be locked.
  • The steering cannot be unlocked (the engine cannot be started).
Body Electrical > Smart Key > Data List

Tester Display

S Code Check

OK:

OK is displayed on the GTS.

OK

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

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

10.

READ VALUE USING GTS (DOOR COURTESY SW)

(a) Using the GTS, check the following main body ECU (multiplex network body ECU) Data List item by opening and closing the each door to confirm the state of the each door courtesy light switch assembly.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Door Courtesy Switch Status

Front door RH courtesy light switch signal

OFF or ON

OFF: Front door RH closed

ON: Front door RH open

-

FL Door Courtesy Switch Status

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

FR Door Courtesy Switch Status

FL Door Courtesy Switch Status

OK:

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

NG

GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit)

OK

11.

READ VALUE USING GTS (STEERING LOCK REQUEST RECEIVE)

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

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

(b) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering 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 ignition switch off)

NG: Certification ECU (smart key ECU assembly) does not send steering lock command (no door opened with ignition 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 Key > Data List

Tester Display

Steering Lock Request Receive

OK:

Within 10 seconds after any of the doors is opened with ignition switch off, the Data List item changes to "OK".

OK

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

12.

READ VALUE USING GTS (STEERING LOCK REQUEST RECEIVE)

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

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

(b) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering 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 ignition switch off)

NG: Certification ECU (smart key ECU assembly) does not send steering lock command (no door opened with shift lever in P and ignition 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 Key > Data List

Tester Display

Steering Lock Request Receive

OK:

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

OK

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

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

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