Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AREW
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate; 2019 - 2022 MY Avalon [04/2018 -        ]

All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate

DESCRIPTION

If the entry lock and wireless door lock operations cannot be performed, the electrical key and tire pressure monitoring system receiver assembly may be malfunctioning, or there may be wave interference or problems in the communication which is used for the entry and wireless function between the electrical key and tire pressure monitoring system receiver assembly and certification ECU (smart key ECU assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The smart key system (for Entry Function, Gasoline Model) uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function, Gasoline Model) after confirming that the communication systems are functioning properly.

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

  • When using the Techstream with the engine 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.
  • Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to Precaution.

    Click here 2019 - 2021 MY Avalon [04/2018 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): PRECAUTION 2022 MY Avalon [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): PRECAUTION

  • After repair, confirm that no DTCs are output.
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Check that there are no electrical key transmitter sub-assemblies in the vehicle.
  • Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output.

    Click here 2019 - 2022 MY Avalon [04/2018 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for Gasoline Model): DTC CHECK / CLEAR

  • When replacing the electrical key and tire pressure monitoring system receiver assembly, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal.

    Click here 2019 MY Avalon [04/2018 - 08/2019]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM(for Gasoline Model): REGISTRATION 2020 - 2022 MY Avalon [08/2019 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM(for Gasoline Model): REGISTRATION

  • It is necessary to perform initialization (Click here 2019 - 2022 MY Avalon [04/2018 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM(for Gasoline Model): INITIALIZATION ) after registration (Click here 2019 MY Avalon [04/2018 - 08/2019]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM(for Gasoline Model): REGISTRATION 2020 - 2022 MY Avalon [08/2019 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM(for Gasoline Model): REGISTRATION ) of the transmitter IDs into the electrical key and tire pressure monitoring system receiver assembly if the electrical key and tire pressure monitoring system receiver assembly has been replaced.

PROCEDURE

1.

INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

HINT:

It may be possible to tell whether the battery is discharged by operating the horn.

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

NEXT

2.

CHECK FOR DTC

(a) Open the driver door using the mechanical key built into the electrical key transmitter sub-assembly.

(b) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

CHECK DOOR AJAR WARNING

(a) When the doors are locked by operating the entry lock function with all doors closed, check that the door ajar warning operates.

HINT:

Be sure to check the following before performing the procedure.

  • Engine switch is off.
  • All the doors is close.
  • The lock sensor is on or lock switch is pressed on the electrical key transmitter sub-assembly.
  • Electrical key transmitter sub-assembly is in the vehicle exterior detection area.

Result

Proceed to

The wireless buzzer does not sound

A

The wireless buzzer sounds

B

B

GO TO LIGHTING SYSTEM (Proceed to Door Courtesy Switch Circuit)

A

4.

CHECK POWER DOOR LOCK CONTROL SYSTEM

(a) When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM (for Gasoline Model): OPERATION CHECK

Result

Proceed to

Power door lock function operates normally

A

Power door lock function does not operate normally

B

B

GO TO POWER DOOR LOCK CONTROL SYSTEM

A

5.

CHECK KEY DIAGNOSTIC MODE

(a) Check the following antennas in key diagnostic mode.

Body Electrical > Smart Key > Utility

Tester Display

Communication Check(Key Diag Mode)

(1) Check the electrical key antenna (for driver door):

When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the front door outside handle assembly (for driver door), check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a

0.7 to 1 m (2.30 to 3.28 ft.)

(2) Check the electrical key antenna (for front passenger door):

When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the front door outside handle assembly (for front passenger door), check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a

0.7 to 1 m (2.30 to 3.28 ft.)

(3) Check the No. 1 indoor electrical key antenna assembly (front floor):

When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a

Inspection Point

(4) Check the No. 1 indoor electrical key antenna assembly (rear floor):

When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a

Inspection Point

(5) Check the No. 1 indoor electrical key antenna assembly (inside luggage compartment):

When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a

Inspection Point

(6) Check the electrical key antenna (outside luggage compartment):

When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the electrical key antenna (outside luggage compartment), check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

OK:

Wireless buzzer sounds.

*a

0.7 to 1 m (2.30 to 3.28 ft.)

Result

Proceed to

Key diagnostic mode inspections fail for both channels

A

Key diagnostic mode inspections succeed for both channels

B

Key diagnostic mode inspection succeeds for only one of the channels

C

B

GO TO STEP 18

C

GO TO STEP 28

A

6.

CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly near the electrical key and tire pressure monitoring system receiver assembly and perform a wireless operation 2 or more times*.

  • *: When the wireless function is operated, channel 1 and 2 are used alternately. If the first wireless operation is performed successfully and the second wireless operation fails, wave interference may be occurring for either channel.

HINT:

  • When the electrical key transmitter sub-assembly is brought near the electrical key and tire pressure monitoring system receiver assembly, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
  • If the inspection result is that the problem only occurs in certain locations or at certain times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.
  • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.
  • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.

Result

Proceed to

Wireless function does not operate normally

A

Wireless function operates normally

B

B

AFFECTED BY WAVE INTERFERENCE

A

7.

CHECK TRANSMITTER BATTERY

(a) Check the transmitter battery level of the electrical key transmitter sub-assembly that was checked first.

(1) Press and hold the lock switch of the electrical key transmitter sub-assembly for 5 seconds and check the number of times that the LED illuminates.

HINT:

  • The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is being used. "Yes" is displayed for the Data List item "Key Low Battery" when this voltage information indicates 2.2 V or less.

    Click here 2019 - 2022 MY Avalon [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): DATA LIST / ACTIVE TEST

  • Even if the transmitter battery is depleted, it is still possible to start the engine by holding the electrical key transmitter sub-assembly near the engine switch, depressing the brake pedal and pressing the engine switch.

Result

Proceed to

LED illuminates 3 times or more when switch is pressed and held

A

LED does not illuminate when switch is pressed and held

B

LED illuminates once or twice but not a third time

C

B

GO TO STEP 17

C

REPLACE TRANSMITTER BATTERY

A

8.

CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Check if there is another electrical key transmitter sub-assembly available that is already registered to the vehicle.

Result

Proceed to

Another registered electrical key transmitter sub-assembly is not available

A

Another registered electrical key transmitter sub-assembly is available

B

B

GO TO STEP 10

A

9.

ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY REGISTRATION (NEW ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY)

(a) Register a new electrical key transmitter sub-assembly.

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

NEXT

10.

CHECK ENTRY LOCK OPERATION

(a) Using another registered electrical key transmitter sub-assembly, check that the function operates normally.

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B

B

END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE)

A

11.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER AND BODY GROUND)

(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the K11 electrical key and tire pressure monitoring system receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K10-18 (RCO) - K11-8 (+5)

Always

Below 1 Ω

K10-19 (RDAM) - K11-2 (DATA)

Always

Below 1 Ω

K10-20 (CSEL) - K11-6 (CSEL)

Always

Below 1 Ω

K11-12 (GND) - Body ground

Always

Below 1 Ω

K10-18 (RCO) or K11-8 (+5) - Other terminals and body ground

Always

10 kΩ or higher

K10-19 (RDAM) or K11-2 (DATA) - Other terminals and body ground

Always

10 kΩ or higher

K10-20 (CSEL) or K11-6 (CSEL) - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

CHECK ENTRY LOCK OPERATION

(a) Connect all connectors and check that the function operates normally.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): OPERATION CHECK

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B

B

END (CONNECTOR WAS NOT CONNECTED SECURELY)

A

13.

CHECK ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K11-12 (GND) - Body ground

Always

Below 1 Ω

(b) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

K11-2 (DATA) - K11-12 (GND)

Procedure:

  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

5 V/DIV., 500 ms/DIV.

Below 1 V → Pulse generation

(See waveform 1)

*a

Component with harness connected

(Electrical Key and Tire Pressure Monitoring System Receiver Assembly)

*b

Waveform 1

*c

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*d

After lock or unlock switch of electrical key transmitter sub-assembly pressed

NG

REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL

OK

14.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K11-1 (IG) - K11-12 (GND)

Engine switch on (IG)

10 to 16 V

K11-6 (CSEL) - K11-12 (GND)

Procedure:

  1. Engine switch off
  2. All doors closed

Below 1 V → Pulse generation

*a

Component with harness connected

(Electrical Key and Tire Pressure Monitoring System Receiver Assembly)

(b) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

K11-8 (+5) - K11-12 (GND)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

*a

Component with harness connected

(Electrical Key and Tire Pressure Monitoring System Receiver Assembly)

*b

Waveform 1

*c

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*d

After lock or unlock switch of electrical key transmitter sub-assembly pressed

NG

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

OK

15.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

HINT:

  • For replacement.

    Click here 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

  • For registration.

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

NEXT

16.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the wireless function operates normally.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for Gasoline Model): OPERATION CHECK

Result

Proceed to

Wireless door lock function operates normally

A

Wireless door lock function does not operate normally

B

A

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

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

17.

INSPECT TRANSMITTER BATTERY

(a) Inspect the transmitter battery.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; DOOR LOCK: DOOR CONTROL TRANSMITTER: INSPECTION

NOTICE:

Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. The terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.

OK

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

NG

REPLACE TRANSMITTER BATTERY

18.

PERFORM REGISTRATION

(a) Perform registration of the B code.

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

NEXT

19.

CHECK ENTRY LOCK OPERATION

(a) After completing B code registration, check that the entry lock and unlock functions can be operated 2 times consecutively.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): OPERATION CHECK

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B

B

END (B CODE REGISTRATION FAILED)

A

20.

READ VALUE USING TECHSTREAM (B CODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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

B Code

B code registration status

No Regd or Regd

No Regd: B code not registered correctly

Regd: B code registered correctly

-

Body Electrical > Smart Key > Data List

Tester Display

B Code

Result

Proceed to

"No Regd" is displayed on the Techstream

A

"Regd" is displayed on the Techstream

B

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

A

21.

READ VALUE USING TECHSTREAM (B CODE DIFFERENCE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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

B Code Difference

B code mismatch

No or Yes

No: Communication normal

Yes: Communication malfunction

-

Body Electrical > Smart Key > Data List

Tester Display

B Code Difference

Result

Proceed to

"No" is displayed on the Techstream

A

"Yes" is displayed on the Techstream

B

B

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

A

22.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Measure the voltage while checking the Data List on the Techstream.

(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 / Power Source Control / Data List.

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

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

-

-

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Power Supply Condition

Power supply state

All OFF, ACC ON, IG ON or ST ON

All OFF: Engine switch off

ACC ON: Engine switch on (ACC)

IG ON: Engine switch on (IG)

ST ON: Sending engine start request signal

-

Body Electrical > Power Source Control > Data List

Tester Display

Power Supply Condition

Standard Voltage:

Tester Connection

Condition

Specified Condition

G40-17 (IG1D) - Body ground

Engine switch off

Below 1 V

Engine switch on (ACC)

Below 1 V

Engine switch on (IG)

9 V or higher

G40-16 (ACCD) - Body ground

Engine switch off

Below 1 V

Engine switch on (ACC)

9 V or higher

Engine switch on (IG)

9 V or higher

NG

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

OK

23.

READ VALUE USING TECHSTREAM (ACC SW, IG SW)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ACC SW

Engine switch status

OFF or ON

OFF: Engine switch off

ON: Engine switch on (ACC)

"ON" is also displayed when the engine switch is on (IG).

IG SW

Engine switch status

OFF or ON

OFF: Engine switch off

ON: Engine switch on (IG)

"OFF" is also displayed when the engine switch is on (ACC).

Body Electrical > Main Body > Data List

Tester Display

ACC SW

IG SW

HINT:

If the certification ECU (smart key ECU assembly) misjudges for any reason that the engine switch is on (IG) even though the engine switch is off, the entry lock and unlock functions will be disabled.

Result

Proceed to

The main body ECU (multiplex network body ECU) judges properly that the power source is off when the engine switch is off

A

The main body ECU (multiplex network body ECU) does not judge properly that the power source is off when the engine switch is off

B

B

TROUBLESHOOT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

A

24.

CHECK HARNESS AND CONNECTOR (BODY GROUND, POWER SUPPLY)

(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.

*a

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G40-18 (E) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G40-15 (CUTB) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

25.

CHECK ENTRY LOCK OPERATION

(a) Disconnect and reconnect the certification ECU (smart key ECU assembly) connectors.

(b) Check that the function operates normally.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): OPERATION CHECK

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B

B

END (CONNECTOR WAS NOT CONNECTED SECURELY)

A

26.

REPLACE 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 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

  • For registration.

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

NEXT

27.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the function operates normally.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for Gasoline Model): OPERATION CHECK

Result

Proceed to

Wireless door lock function operates normally

A

Wireless door lock function does not operate normally

B

A

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

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

28.

CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly near the electrical key and tire pressure monitoring system receiver assembly and perform a wireless operation 2 or more times*.

  • *: When the wireless function is operated, channel 1 and 2 are used alternately. If the first wireless operation is performed successfully and the second wireless operation fails, wave interference may be occurring for either channel.

HINT:

  • When the electrical key transmitter sub-assembly is brought near the electrical key and tire pressure monitoring system receiver assembly, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
  • If the inspection result is that the problem only occurs in certain locations or at certain times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.
  • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.
  • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.

Result

Proceed to

Wireless function does not operate normally

A

Wireless function operates normally 1 or more times.

B

B

AFFECTED BY WAVE INTERFERENCE

A

29.

CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Check if there is another electrical key transmitter sub-assembly available that is already registered to the vehicle.

Result

Proceed to

Another registered electrical key transmitter sub-assembly is not available

A

Another registered electrical key transmitter sub-assembly is available

B

B

GO TO STEP 31

A

30.

ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY REGISTRATION (NEW ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY)

(a) Register a new electrical key transmitter sub-assembly.

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

NEXT

31.

CHECK WAVE ENVIRONMENT

(a) Bring another registered electrical key transmitter sub-assembly near the electrical key and tire pressure monitoring system receiver assembly and perform a wireless operation 2 or more times*.

  • *: When the wireless function is operated, channel 1 and 2 are used alternately. If the first wireless operation is performed successfully and the second wireless operation fails, wave interference may be occurring for either channel.

HINT:

  • If the inspection result is that the problem only occurs in certain locations or at certain times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.
  • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.
  • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.

Result

Proceed to

Wireless function does not operate normally

A

Wireless function operates normally 1 or more times.

B

B

END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE)

A

32.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY)

(a) Disconnect the K11 electrical key and tire pressure monitoring system receiver assembly connector.

(b) Disconnect the K10 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

K11-6 (CSEL) - K10-20 (CSEL)

Always

Below 1 Ω

K11-6 (CSEL) or K10-20 (CSEL) - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

33.

CHECK ENTRY LOCK OPERATION

(a) Connect all connectors and check that the function operates normally.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): OPERATION CHECK

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B

B

END (CONNECTOR WAS NOT CONNECTED SECURELY)

A

34.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K11-6 (CSEL) - K11-12 (GND)

Procedure:

  1. Engine switch off
  2. All doors closed

Below 1 V → Pulse generation

*a

Component with harness connected

(Electrical Key and Tire Pressure Monitoring System Receiver Assembly)

NG

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

OK

35.

CHECK ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY

(a) Enter key diagnostic mode and select the channel for which the wireless buzzer did not sound.

(b) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

K11-2 (DATA) - K11-12 (GND)

Procedure:

  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

5 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

HINT:

Inspection should be performed while the electrical key antenna check in key diagnostic mode is being performed on the failed channel (the channel in which the buzzer did not sound).

*a

Component with harness connected

(Electrical Key and Tire Pressure Monitoring System Receiver Assembly)

*b

Waveform 1

*c

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*d

After lock or unlock switch of electrical key transmitter sub-assembly pressed

NG

REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL

OK

36.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

HINT:

  • For replacement.

    Click here 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

  • For registration.

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

NEXT

37.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the function operates normally.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for Gasoline Model): OPERATION CHECK

Result

Proceed to

Wireless door lock function operates normally

A

Wireless door lock function does not operate normally

B

A

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

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL