Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B2OR
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Steering Lock does not Lock; 2019 - 2022 MY Avalon HV [04/2018 -        ]

Steering Lock does not Lock

DESCRIPTION

The 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 Item

Active Test Item

Steering Lock does not Lock

Smart Key

  • Lock Request Receive
  • L Code Check
  • Steering Lock

Main Body

  • FL Door Courtesy SW

Power Source Control

  • Shift P Signal

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the power switch off, connect the Techstream to the DLC3 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.
  • 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 power switch on (ACC) or on (IG).
    • To lock the steering, turn the power switch off with the shift lever in P, and then open a door.
  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): DIAGNOSTIC TROUBLE CODE CHART 2021 MY Avalon HV [08/2020 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): DIAGNOSTIC TROUBLE CODE CHART 2022 MY Avalon HV [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): DIAGNOSTIC TROUBLE CODE CHART

  • The smart key system (for Start Function, HV Model) 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, HV Model) after confirming that the communication systems are functioning properly.

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • 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 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

  • After performing repairs, confirm that the problem does not recur.
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected.

    Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY Avalon Avalon HV [08/2021 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

READ VALUE USING TECHSTREAM (LOCK REQUEST RECEIVE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Key / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Smart Key > 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 power switch off)

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

Lock Request Receive

OK:

The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the power 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.

NG

GO TO STEP 7

OK

2.

READ VALUE USING TECHSTREAM (L CODE CHECK)

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

Body Electrical > Smart Key > 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 hybrid control system cannot be started).

Body Electrical > Smart Key > 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.
NG

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

for Manual Tilt and Manual Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column): DISASSEMBLY

for Power Tilt and Power Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Power Tilt and Power Telescopic Steering Column): DISASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G43-1 (GND) - Body ground

Always

Below 1 Ω

NOTICE:

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G43-7 (B) - Body ground

Power switch off

11 to 14 V

*a

Front view of wire harness connector

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

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

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

(a) Connect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) Move the shift lever to P and turn the power switch off.

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

*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

G43-3 (IGE) - G43-1 (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 power switch on (ACC) or on (IG).
    • To lock the steering, turn the power switch off with the shift lever in P, and then open a door.
OK

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

for Manual Tilt and Manual Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column): DISASSEMBLY

for Power Tilt and Power Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Power Tilt and Power Telescopic Steering Column): DISASSEMBLY

NG

5.

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

(a) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) Disconnect the G40 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

G43-3 (IGE) - G40-25 (SLR+)

Always

Below 1 Ω

G43-3 (IGE) or G40-25 (SLR+) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

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

(a) Connect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) Connect the G40 certification ECU (smart key ECU assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G43-3 (IGE) - Body ground

Power 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) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

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

for Manual Tilt and Manual Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column): DISASSEMBLY

for Power Tilt and Power Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Power Tilt and Power Telescopic Steering Column): DISASSEMBLY

7.

READ VALUE USING TECHSTREAM (FL DOOR COURTESY SW)

(a) 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.

NG

GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit)

OK

8.

READ VALUE USING TECHSTREAM (SHIFT P SIGNAL)

(a) Move the shift lever to P.

(b) 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 whether the shift lever position switch (P) is malfunctioning.

Body Electrical > Power Source Control > Data List

Tester Display

Shift P Signal

OK:

ON is displayed on the Techstream.

NG

GO TO OTHER PROBLEM 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): PROBLEM SYMPTOMS TABLE 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): PROBLEM SYMPTOMS TABLE

OK

9.

READ VALUE USING TECHSTREAM (STEERING LOCK)

(a) Check that the steering is unlocked.

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

Body Electrical > Smart Key > 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 Key > Data List

Tester Display

Steering Lock

OK:

Set is displayed on the Techstream.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

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

for Manual Tilt and Manual Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column): DISASSEMBLY

for Power Tilt and Power Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Power Tilt and Power Telescopic Steering Column): DISASSEMBLY