THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): Driver Side Door Entry Lock and Unlock Functions do not Operate; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001GU3C
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): Driver Side Door Entry Lock and Unlock Functions do not Operate; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

Driver Side Door Entry Lock and Unlock Functions do not Operate

DESCRIPTION

If the entry lock and unlock functions do not operate for the driver door only, the request code may not be being transmitted from the driver door or the front door outside handle assembly (for driver door) (touch sensor) may be malfunctioning. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and electrical key and tire pressure warning ECU and receiver is normal. In this case, there may be a problem with request code transmission (communication between the certification ECU (smart key ECU assembly) and front door outside handle assembly (for driver door) (electrical key antenna)), or there may be wave interference.

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
Before replacing the certification ECU (smart key ECU assembly), refer to Precaution.
Click here
After repair, confirm that no DTCs are output.
Check that there are no electrical key transmitter sub-assemblies in the vehicle.

HINT:

If the driver door entry lock and unlock functions do not operate, the cause of the malfunction may be stored in the certification ECU (smart key ECU assembly).
If the cause of the malfunction is stored in the certification ECU (smart key ECU assembly), the following table is helpful in checking whether the malfunction was caused by wave interference.

Body Electrical > Smart Key > Utility

Tester Display
Operation History

PROCEDURE

1.	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

OK:

Door locks operate normally.

GO TO POWER DOOR LOCK CONTROL SYSTEM

2.	CHECK ENTRY OPERATION

(a) Check the operation of the entry lock and unlock functions.

(1) Check that the entry unlock function.

Turn the power switch off.
Open and close the driver door.
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.
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.
Check that the LED of the electrical key transmitter sub-assembly blinks.
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).

*a	Unlock Sensor (Backside)

(2) Check that the entry lock function.

Turn the power switch off.
Open and close the driver door.
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.
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.

*a	Lock Sensor

Result	Proceed to
Entry function does not operate normally	A
Entry function operates normally	B

GO TO CHECK FOR INTERMITTENT PROBLEMS (OPERATION HISTORY)

3.	CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the front door outside handle assembly (for driver door) and perform an entry function check.

Click here

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the front door outside handle assembly (for driver door).

When the electrical key transmitter sub-assembly is brought near the front door outside handle assembly (for driver door), 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.

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.

*a	Approximately 0.3 m (0.984 ft.)

Result	Proceed to
Entry function does not operate normally	A
Entry function operates normally	B

AFFECTED BY WAVE INTERFERENCE

4.	READ VALUE USING TECHSTREAM (D-DOOR TOUCH SENSOR)

(a) Turn the power switch off.

*a	Unlock Sensor (Backside)

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Open and close the driver door.

(f) 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.

(g) 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.

(h) Check that the LED of the electrical key transmitter sub-assembly blinks.

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

(j) 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 (f).

HINT:

When checking the operation of the unlock sensor again, make sure to perform the procedure from step (a).

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D-Door Touch Sensor

Driver door touch sensor (unlock sensor)

OFF or ON

OFF: Driver door touch sensor (unlock sensor) not touched

ON: Driver door touch sensor (unlock sensor) touched

Displays whether the unlock sensor is on or off (even if the sensor is touched and contact is maintained, "ON" is displayed only momentarily).
Use this Data List item to help determine if there is an unlock sensor malfunction when the entry unlock function does not operate.

Body Electrical > Smart Key > Data List

Tester Display
D-Door Touch Sensor

OK:

The Techstream display changes correctly in response to the operation of the front door outside handle assembly (for driver door).

GO TO STEP 6

5.	READ VALUE USING TECHSTREAM (D-DOOR TRIGGER SWITCH)

(a) Turn the power switch off.

*a	Lock Sensor

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Open and close the driver door.

(f) 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.

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

(h) 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 (a).
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.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D-Door Trigger Switch

Driver door touch sensor (lock sensor)

OFF or ON

OFF: Driver door touch sensor (lock sensor) not touched

ON: Driver door touch sensor (lock sensor) touched

Displays whether the lock sensor is on or off (even if the sensor is touched and contact is maintained, "ON" is displayed only momentarily).
Use this Data List item to help determine if there is a lock sensor malfunction when the entry lock function does not operate.

Body Electrical > Smart Key > Data List

Tester Display
D-Door Trigger Switch

Result	Proceed to
The Techstream display does not change correctly in response to the operation of the front door outside handle assembly (for driver door).	A
The Techstream display changes correctly in response to the operation of the front door outside handle assembly (for driver door).	B

GO TO STEP 10

6.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR))

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

(b) Disconnect the L3 front door outside handle assembly (for driver door) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O61-17 (CLG1) - L3-6 (ANT1)	Always	Below 1 Ω
O61-16 (CG1B) - L3-4 (ANT2)	Always	Below 1 Ω
O61-17 (CLG1) or L3-6 (ANT1) - Other terminals and body ground	Always	10 kΩ or higher
O61-16 (CG1B) or L3-4 (ANT2) - Other terminals and body ground	Always	10 kΩ or higher

(d) Reconnect the O61 certification ECU (smart key ECU assembly) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER DOOR ELECTRICAL KEY ANTENNA)

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

L3-6 (ANT1) - L3-4 (ANT2)

Procedure:

Power switch off
All doors closed
Electrical key transmitter sub-assembly not inside vehicle
All doors locked through wireless operation
(electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 100 ms/DIV.

Pulse generation

(See waveform 1)

*: For details about the entry function detection area, refer to Operation Check.

Click here

Front view of wire harness connector

(to Front Door Outside Handle Assembly (for Driver Door))

Waveform 1

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

8.	REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)

(a) Replace the front door outside handle assembly (for driver door) with a new one or the front door outside handle assembly (for front passenger door) if it is functioning properly.

Click here

9.	CHECK ENTRY OPERATION

(a) Check that the function operates normally.

Click here

Result	Proceed to
Entry function operates normally	A
Entry function does not operate normally	B

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR) WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

10.	CHECK KEY DIAGNOSTIC MODE

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

Body Electrical > Smart Key > Utility

Tester Display
Communication Check(Key Diag Mode)

(b) Select either channel 1 or channel 2 and perform key diagnostic mode inspection for each channel.

(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.)

Result	Proceed to
Wireless buzzer does not sound	A
Wireless buzzer sounds	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

11.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR))

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

(b) Disconnect the L3 front door outside handle assembly (for driver door) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O61-17 (CLG1) - L3-6 (ANT1)	Always	Below 1 Ω
O61-16 (CG1B) - L3-4 (ANT2)	Always	Below 1 Ω
O61-17 (CLG1) or L3-6 (ANT1) - Other terminals and body ground	Always	10 kΩ or higher
O61-16 (CG1B) or L3-4 (ANT2) - Other terminals and body ground	Always	10 kΩ or higher

(d) Reconnect the O61 certification ECU (smart key ECU assembly) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER DOOR ELECTRICAL KEY ANTENNA)

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

L3-6 (ANT1) - L3-4 (ANT2)

Procedure:

Power switch off
All doors closed
Electrical key transmitter sub-assembly not inside vehicle
All doors locked through wireless operation
(electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 100 ms/DIV.

Pulse generation

(See waveform 1)

*: For details about the entry function detection area, refer to Operation Check.

Click here

Front view of wire harness connector

(to Front Door Outside Handle Assembly (for Driver Door))

Waveform 1

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

13.	CHECK ENTRY OPERATION

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

Click here

Result	Proceed to
Entry function does not operate normally	A
Entry function operates normally	B

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)

END (CONNECTOR WAS NOT CONNECTED SECURELY)