Toyota Yaris: Smart Key System (for Start Function) / Steering Lock Position Signal Compare Failure (B228562)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Steering Lock Position Signal Compare Failure (B228562)

DESCRIPTION

This DTC is stored when the steering lock position signal sent by the steering lock ECU (steering lock actuator or upper bracket assembly) via direct line and the steering lock position signal sent via LIN communication do not match.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B228562

Steering Lock Position Signal Compare Failure

The steering lock position signal sent by the steering lock ECU (steering lock actuator or upper bracket assembly) via direct line and the steering lock position signal sent via LIN communication do not match. (1-trip detection logic*)
  • LIN communication system
  • Steering lock ECU (steering lock actuator or upper bracket assembly)
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
  • Disconnect the cable from the negative (-) auxiliary battery terminal, wait 30 seconds and then reconnect the cable to the negative (-) auxiliary battery terminal. Wait at least 40 seconds with the ignition switch off (wait is the steering locked), then turn the ignition switch to ON (steering unlocked) and wait at least 40 seconds.
  • *: Only detected while a malfunction is present and the ignition switch is ON.
Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

The engine cannot be started.

The ECU does not send an engine start request.
Related Data List and Active Test Items

DTC No.

Data List and Active Test

B228562
Power Source Control
  • Steering Unlock Switch
Smart Key
  • Power Supply Short History
  • Motor Driver Short History
  • Lock Bar Stuck Error History

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.
  • 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

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to Registration.

    Click here

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

HINT:

  • If the steering cannot be unlocked, the ignition switch cannot be turned to ON and the engine cannot be started.
  • If LIN communication is not available, the steering cannot be locked or unlocked.

OK:

LIN communication system DTC B278588 is not output simultaneously.

NG

GO TO DTC B278588

OK

2.

INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect 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

H71-4 (SLP1) - Body ground

Steering locked

11 to 14 V

H71-4 (SLP1) - Body ground

Steering unlocked

Below 1.5 V

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

NG

GO TO STEP 6

OK

3.

READ VALUE USING GTS (STEERING UNLOCK SWITCH)

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

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering Unlock Switch

State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or upper bracket assembly)

OFF or ON

OFF: Steering locked
  • When the ignition switch is off, if any door is opened or closed, the steering is locked.
  • When the electrical key transmitter sub-assembly is in the cabin and the ignition switch is turned ACC or ON, the steering unlocks.
  • The engine cannot be started when the steering unlock signal is off.
Body Electrical > Power Source Control > Data List

Tester Display

Steering Unlock Switch

OK:

The GTS display changes.

Result

Proceed to

The value of Steering Unlock Switch is OFF

A

The value of Steering Unlock Switch is not OFF

B
B

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

A

4.

READ VALUE USING GTS (STEERING UNLOCK SWITCH)

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

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering Unlock Switch

State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or upper bracket assembly)

OFF or ON

ON: Steering unlocked
  • When the ignition switch is off, if any door is opened or closed, the steering is locked.
  • When the electrical key transmitter sub-assembly is in the cabin and the ignition switch is turned ACC or ON, the steering unlocks.
  • The engine cannot be started when the steering unlock signal is off.
Body Electrical > Power Source Control > Data List

Tester Display

Steering Unlock Switch

OK:

The GTS display changes.

Result

Proceed to

The value of Steering Unlock Switch is ON

A

The value of Steering Unlock Switch is not ON

B
B

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

A

5.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H71-4 (SLP1) - Body ground

Steering locked

10 kΩ or higher

H71-4 (SLP1) - Body ground

Steering unlocked*

Below 1 Ω

HINT:

  • *: If any of the doors are opened and the ignition switch off, the steering will be locked. If the ignition switch is turned to ACC or ON with the electrical key transmitter sub-assembly in the cabin, the steering will be unlocked.
  • DTC B228562 may be stored due to a malfunction in the steering lock ECU (steering lock actuator or upper bracket assembly). The steering lock position signal and unlock position signal are sent from the steering lock ECU (steering lock actuator or upper bracket assembly) to the certification ECU (smart key ECU assembly) individually.

*a

Component with harness connected

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

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

OK

6.

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

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H46-11 (SLP) - H71-4 (SLP1)

Always

Below 1 Ω

H46-11 (SLP) or H71-4 (SLP1) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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