Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GU38
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 04/2020]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate; 2020 MY Corolla Corolla HV [01/2019 - 04/2020]

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 warning ECU and receiver 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 warning ECU and receiver and certification ECU (smart key ECU assembly).

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

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

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

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): PRECAUTION

  • 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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model): DTC CHECK / CLEAR

  • After repair, confirm that no DTCs are output.
  • Inspect the fuses for circuits related to this system before performing the following procedure.*
  • It is necessary to perform initialization after registration of the transmitter IDs into the electrical key and tire pressure warning ECU and receiver if the electrical key and tire pressure warning ECU and receiver has been replaced.*
    • for initialization:

      Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM (for HV Model): INITIALIZATION

    • for registration:

      Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM (for HV Model): REGISTRATION

    • *: for 12 Pin Type

PROCEDURE

1.

INSPECT AUXILIARY BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage with the power switch off.

Standard Voltage:

11 to 14 V

HINT:

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

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

NEXT

2.

CHECK ENTRY OPERATION AND WIRELESS OPERATION

(a) Check the operation of the entry lock and unlock functions, and wireless door lock function.

(1) Check that the entry unlock function.

  1. Turn the power switch off.
  2. Open and close the driver door.
  3. With the electrical key transmitter sub-assembly outside of the vehicle, press the lock switch of the electrical key transmitter sub-assembly to lock all of the doors.
  4. Hold the electrical key transmitter sub-assembly at the same height as the door outside handle assembly and approximately 0.3 m (0.984 ft.) from the driver door.
  5. Check that the LED of the electrical key transmitter sub-assembly blinks.
  6. Touch the unlock sensor on the backside of the front door outside handle assembly (for driver door) for 2 seconds or more.*
  • *: Perform this step 3 seconds or more after performing step (3).

HINT:

  • When checking the operation of the unlock sensor again, make sure to perform the procedure from step (1).
  • Perform the same inspection for the front passenger door.

*a

Unlock Sensor (Backside)

(2) Check that the entry lock function.

  1. Turn the power switch off.
  2. Open and close the driver door.
  3. Hold the electrical key transmitter sub-assembly at the same height as the door outside handle assembly and approximately 0.3 m (0.984 ft.) from the driver door.
  4. Touch the lock sensor of the front door outside handle assembly (groove on the front door outside handle) with 2 or more fingers for 2 seconds or more.

    HINT:

    • If the door does not lock even when touching the lock sensor for 2 seconds or more, touch it with your palm.
    • When checking the operation of the lock sensor again, make sure to perform the procedure from step (1).
    • When checking the operation of the entry lock function several times, it can be operated up to 2 times consecutively. To operate the function 3 times or more consecutively, the doors need to be unlocked once. However, this is only for the entry lock function, other door lock operations, such as a wireless door lock operation can be performed consecutively.
    • Perform the same inspection for the front passenger door.

*a

Lock Sensor

(3) Check the luggage compartment door open function.

  1. With the luggage compartment door closed, press the luggage electrical key switch while carrying the electrical key transmitter sub-assembly and check that the luggage compartment door opens.

*1

Luggage Electrical Key Switch

*a

0.7 to 1 m (2.30 to 3.28 ft.)

(4) Check that the wireless door lock function.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model): OPERATION CHECK

Result

Proceed to

All door entry lock/unlock functions and wireless functions do not operate

A

All door entry lock/unlock functions do not operate, but wireless functions operate

B

Entry lock/unlock functions do not operate for one or more doors, but wireless functions operate

Entry lock function does not operate for one or more doors, but entry unlock and wireless functions operate

Entry unlock function does not operate for one or more doors, but entry lock and wireless functions operate

All entry and wireless functions operate

C
B

GO TO PROBLEM SYMPTOMS TABLE

C

GO TO CHECK FOR INTERMITTENT PROBLEMS (OPERATION HISTORY)

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.

  • Power 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.
  • The customize setting Open Door Warning is ON.
  • The customize setting Wireless Lock Function with Doors Open is OFF.

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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM (for Sedan, HV 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. 2 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. 3 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 26

A

6.

CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly near the electrical key and tire pressure warning ECU and receiver 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 warning ECU and receiver, 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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): DATA LIST / ACTIVE TEST

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

HINT:

Refer to registration.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

NEXT

10.

CHECK ENTRY 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 WARNING ECU AND RECEIVER AND BODY GROUND)

(a) Disconnect the O61 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the O18*1 or O38*2 electrical key and tire pressure warning ECU and receiver connector.

  • *1: for 12 Pin Type
  • *2: for 5 Pin Type

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

Standard Resistance:

for 12 Pin Type:

Tester Connection

Condition

Specified Condition

O61-18 (RCO) - O18-8 (+5)

Always

Below 1 Ω

O61-21 (RDAM) - O18-2 (DATA)

Always

Below 1 Ω

O61-19 (CSEL) - O18-6 (CSEL)

Always

Below 1 Ω

O18-12 (GND) - Body ground

Always

Below 1 Ω

O61-18 (RCO) or O18-8 (+5) - Other terminals and body ground

Always

10 kΩ or higher

O61-21 (RDAM) or O18-2 (DATA) - Other terminals and body ground

Always

10 kΩ or higher

O61-19 (CSEL) or O18-6 (CSEL) - Other terminals and body ground

Always

10 kΩ or higher

for 5 Pin Type:

Tester Connection

Condition

Specified Condition

O61-18 (RCO) - O38-4 (+5)

Always

Below 1 Ω

O61-21 (RDAM) - O38-5 (DATA)

Always

Below 1 Ω

O61-19 (CSEL) - O38-2 (CSEL)

Always

Below 1 Ω

O38-1 (GND) - Body ground

Always

Below 1 Ω

O61-18 (RCO) or O38-4 (+5) - Other terminals and body ground

Always

10 kΩ or higher

O61-21 (RDAM) or O38-5 (DATA) - Other terminals and body ground

Always

10 kΩ or higher

O61-19 (CSEL) or O38-2 (CSEL) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

CHECK ENTRY OPERATION

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

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV 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 WARNING ECU AND RECEIVER

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

Standard Resistance:

for 12 Pin Type:

Tester Connection

Condition

Specified Condition

O18-12 (GND) - Body ground

Always

Below 1 Ω

for 5 Pin Type:

Tester Connection

Condition

Specified Condition

O38-1 (GND) - Body ground

Always

Below 1 Ω

*A

for 12 Pin Type

*B

for 5 Pin Type

*a

Component with harness connected

(Electrical Key and Tire Pressure Warning ECU and Receiver)

(b) Using an oscilloscope, check the waveform.

OK:

for 12 Pin Type:

Tester Connection

Condition

Tool Setting

Specified Condition

O18-2 (DATA) - O18-12 (GND)

Procedure:

  1. Power 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)

for 5 Pin Type:

Tester Connection

Condition

Tool Setting

Specified Condition

O38-5 (DATA) - O38-1 (GND)

Procedure:

  1. Power 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)

*A

for 12 Pin Type

*B

for 5 Pin Type

*a

Component with harness connected

(Electrical Key and Tire Pressure Warning ECU and Receiver)

*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

Result

Proceed to

OK

A

NG (for 12 Pin Type)

B

NG (for 5 Pin Type)

C
B

REPLACE ELECTRICAL KEY AND TIRE PRESSURE WARNING ECU AND RECEIVER

C

REPLACE SMART DOOR CONTROL RECEIVER ASSEMBLY 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; DOOR LOCK: DOOR CONTROL RECEIVER (for Sedan without Tire Pressure Warning System): REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 04/2020]; DOOR LOCK: DOOR CONTROL RECEIVER (for Sedan without Tire Pressure Warning System): REMOVAL

A

14.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Standard Voltage:

for 12 Pin Type:

Tester Connection

Condition

Specified Condition

O18-1 (IG) - O18-12 (GND)

Power switch on (IG)

10 to 16 V

O18-6 (CSEL) - O18-12 (GND)

Procedure:

  1. Power switch off
  2. All doors closed

Below 1 V → Pulse generation

for 5 Pin Type:

Tester Connection

Condition

Specified Condition

O38-2 (CSEL) - O38-1 (GND)

Procedure:

  1. Power switch off
  2. All doors closed

Below 1 V → Pulse generation

*A

for 12 Pin Type

*B

for 5 Pin Type

*a

Component with harness connected

(Electrical Key and Tire Pressure Warning ECU and Receiver)

(b) Using an oscilloscope, check the waveform.

OK:

for 12 Pin Type:

Tester Connection

Condition

Tool Setting

Specified Condition

O18-8 (+5) - O18-12 (GND)

Procedure:

  1. Power 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)

for 5 Pin Type:

Tester Connection

Condition

Tool Setting

Specified Condition

O38-4 (+5) - O38-1 (GND)

Procedure:

  1. Power 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

for 12 Pin Type

*B

for 5 Pin Type

*a

Component with harness connected

(Electrical Key and Tire Pressure Warning ECU and Receiver)

*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) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; 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 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

  • For registration

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

NEXT

16.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the wireless function operates normally.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV 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) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

17.

INSPECT TRANSMITTER BATTERY

(a) Inspect the transmitter battery.

Click here 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; DOOR LOCK: DOOR CONTROL TRANSMITTER (w/ Smart Key System): 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.

HINT:

Refer to registration.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

NEXT

19.

CHECK ENTRY OPERATION

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

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV 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 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

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

"Regd" is displayed on the Techstream

A

"No Regd" is displayed on the Techstream

B
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

A

21.

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 power 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: Power switch off

ACC ON: Power switch on (ACC)

IG ON: Power switch on (IG)

ST ON: Sending hybrid control system start request signal

-

Body Electrical > Power Source Control > Data List

Tester Display

Power Supply Condition

Standard Voltage:

Tester Connection

Condition

Specified Condition

I1-15 (IG1D) - Body ground

Power switch off

Below 1 V

Power switch on (ACC)

Below 1 V

Power switch on (IG)

9 V or higher

I1-16 (ACCD) - Body ground

Power switch off

Below 1 V

Power switch on (ACC)

8.5 V or higher

Power switch on (IG)

8.5 V or higher
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

OK

22.

READ VALUE USING TECHSTREAM (ACC SW, IG SW)

(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 / 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

Power switch status

OFF or ON

OFF: Power switch off

ON: Power switch on (ACC)

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

IG SW

Power switch status

OFF or ON

OFF: Power switch off

ON: Power switch on (IG)

"OFF" is also displayed when the power 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 power switch is on (IG) even though the power 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 power switch is off

A

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

B
B

TROUBLESHOOT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

A

23.

CHECK ENTRY OPERATION

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

(b) Check that the function operates normally.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV 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

24.

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 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

  • For registration

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

NEXT

25.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the function operates normally.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV 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) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

26.

CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly near the electrical key and tire pressure warning ECU and receiver 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 warning ECU and receiver, 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

27.

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 29

A

28.

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

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

HINT:

Refer to registration.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

NEXT

29.

CHECK KEY DIAGNOSTIC MODE

(a) Enter key diagnostic mode and select the channel for which the wireless door lock buzzer did not sound and perform the inspection again using a different electrical key transmitter sub-assembly than was used in the initial inspection.

Body Electrical > Smart Key > Utility

Tester Display

Communication Check(Key Diag Mode)

Result

Proceed to

Wireless buzzer does not sound

A

Wireless buzzer sounds

B
B

END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE)
A

30.

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

(a) Disconnect the O18*1 or O38*2 electrical key and tire pressure warning ECU and receiver connector.

  • *1: for 12 Pin Type
  • *2: for 5 Pin Type

(b) Disconnect the O61 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

for 12 Pin Type:

Tester Connection

Condition

Specified Condition

O18-6 (CSEL) - O61-19 (CSEL)

Always

Below 1 Ω

O18-6 (CSEL) or O61-19 (CSEL) - Other terminals and body ground

Always

10 kΩ or higher

for 5 Pin Type:

Tester Connection

Condition

Specified Condition

O38-2 (CSEL) - O61-19 (CSEL)

Always

Below 1 Ω

O38-2 (CSEL) or O61-19 (CSEL) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

31.

CHECK ENTRY OPERATION

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

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV 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

32.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Standard Voltage:

for 12 Pin Type:

Tester Connection

Condition

Specified Condition

O18-6 (CSEL) - O18-12 (GND)

Procedure:

  1. Power switch off
  2. All doors closed

Below 1 V → Pulse generation

for 5 Pin Type:

Tester Connection

Condition

Specified Condition

O38-2 (CSEL) - O38-1 (GND)

Procedure:

  1. Power switch off
  2. All doors closed

Below 1 V → Pulse generation

*A

for 12 Pin Type

*B

for 5 Pin Type

*a

Component with harness connected

(Electrical Key and Tire Pressure Warning ECU and Receiver)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

OK

33.

CHECK ELECTRICAL KEY AND TIRE PRESSURE WARNING ECU AND RECEIVER

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

Body Electrical > Smart Key > Utility

Tester Display

Communication Check(Key Diag Mode)

(b) Using an oscilloscope, check the waveform.

OK:

for 12 Pin Type:

Tester Connection

Condition

Tool Setting

Specified Condition

O18-2 (DATA) - O18-12 (GND)

Procedure:

  1. Power 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)

for 5 Pin Type:

Tester Connection

Condition

Tool Setting

Specified Condition

O38-5 (DATA) - O38-1 (GND)

Procedure:

  1. Power 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

for 12 Pin Type

*B

for 5 Pin Type

*a

Component with harness connected

(Electrical Key and Tire Pressure Warning ECU and Receiver)

*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

Result

Proceed to

OK

A

NG (for 12 Pin Type)

B

NG (for 5 Pin Type)

C
B

REPLACE ELECTRICAL KEY AND TIRE PRESSURE WARNING ECU AND RECEIVER

C

REPLACE SMART DOOR CONTROL RECEIVER ASSEMBLY 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; DOOR LOCK: DOOR CONTROL RECEIVER (for Sedan without Tire Pressure Warning System): REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 04/2020]; DOOR LOCK: DOOR CONTROL RECEIVER (for Sedan without Tire Pressure Warning System): REMOVAL

A

34.

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 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

  • For registration

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

NEXT

35.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the function operates normally.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV 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) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL