Toyota Yaris: Smart Key System (for Entry Function) / Front Passenger Side Door Entry Lock and Unlock Functions do not Operate

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Entry Function) / Front Passenger Side Door Entry Lock and Unlock Functions do not Operate

DESCRIPTION

If the entry lock and unlock functions do not operate for the front passenger door only, the request code may not be being transmitted from the front passenger door or the front door outside handle assembly RH (touch sensor) may be malfunctioning. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and the smart door control receiver assembly 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 RH (electrical key antenna)), or there may be wave interference.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • The smart key system (for 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 front passenger side 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

Vehicle Control History (RoB)

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.

NG

GO TO POWER DOOR LOCK CONTROL SYSTEM

OK

2.

CHECK ENTRY OPERATION

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

(1) Check that the entry unlock function.

  1. Turn the ignition switch off.
  2. Open and close the front passenger 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 RH and approximately 0.3 m (0.984 ft.) from the front passenger 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 RH 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.

  1. Turn the ignition switch off.
  2. Open and close the front passenger door.
  3. Hold the electrical key transmitter sub-assembly at the same height as the door outside handle assembly RH and approximately 0.3 m (0.984 ft.) from the front passenger door.
  4. Touch the lock sensor of the front door outside handle assembly RH (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).

*a

Lock Sensor

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B

B

GO TO CHECK FOR INTERMITTENT PROBLEMS (OPERATION HISTORY)

A

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 RH 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 RH.
  • When the electrical key transmitter sub-assembly is brought near the front door outside handle assembly RH, 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

B

AFFECTED BY WAVE INTERFERENCE

A

4.

READ VALUE USING GTS (PASSENGER SIDE UNLOCK SENSOR)

(a) Open and close the front passenger door.

*a

Unlock Sensor (Backside)

(b) 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.

(c) Hold the electrical key transmitter sub-assembly at the same height as the door outside handle assembly RH and approximately 0.3 m (0.984 ft.) from the front passenger door.

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

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

(f) Touch the unlock sensor on the backside of the front door outside handle assembly RH for 2 seconds or more.*

  • *: Perform this step 3 seconds or more after performing step (b).

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

Passenger Side Unlock Sensor

Front passenger door touch sensor (unlock sensor)

OFF or ON

OFF: Front passenger door touch sensor (unlock sensor) not touched

ON: Front passenger 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

Passenger Side Unlock Sensor

OK:

The GTS display changes correctly in response to the operation of the front door outside handle assembly RH.

NG

GO TO STEP 6

OK

5.

READ VALUE USING GTS (PASSENGER SIDE LOCK SENSOR)

(a) Open and close the front passenger door.

*a

Lock Sensor

(b) Hold the electrical key transmitter sub-assembly at the same height as the door outside handle assembly RH and approximately 0.3 m (0.984 ft.) from the front passenger door.

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

(d) Touch the lock sensor of the front door outside handle assembly RH (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

Passenger Side Lock Sensor

Front passenger door touch sensor (lock sensor)

OFF or ON

OFF: Front passenger door touch sensor (lock sensor) not touched

ON: Front passenger 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

Passenger Side Lock Sensor

Result

Proceed to

The GTS display does not change correctly in response to the operation of the front door outside handle assembly RH.

A

The GTS display changes correctly in response to the operation of the front door outside handle assembly RH.

B

B

GO TO STEP 10

A

6.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH)

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

(b) Disconnect the K4 front door outside handle assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H46-10 (CLG2) - K4-4 (ANT1)

Always

Below 1 Ω

H46-9 (CG2B) - K4-6 (ANT2)

Always

Below 1 Ω

H46-10 (CLG2) or K4-4 (ANT1) - Other terminals and body ground

Always

10 kΩ or higher

H46-9 (CG2B) or K4-6 (ANT2) - Other terminals and body ground

Always

10 kΩ or higher

(d) Reconnect the H46 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO FRONT PASSENGER DOOR ELECTRICAL KEY ANTENNA)

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

K4-4 (ANT1) - K4-6 (ANT2)

Procedure:

  1. Ignition switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 500 ms./DIV.

Pulse generation

(See waveform 1)

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

Click here

*a

Front view of wire harness connector

(to Front Door Outside Handle Assembly RH)

*b

Waveform 1

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

8.

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH

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

Click here

NEXT

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

A

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH WAS DEFECTIVE)

B

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 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 RH, 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

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

A

11.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH)

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

(b) Disconnect the K4 front door outside handle assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H46-10 (CLG2) - K4-4 (ANT1)

Always

Below 1 Ω

H46-9 (CG2B) - K4-6 (ANT2)

Always

Below 1 Ω

H46-10 (CLG2) or K4-4 (ANT1) - Other terminals and body ground

Always

10 kΩ or higher

H46-9 (CG2B) or K4-6 (ANT2) - Other terminals and body ground

Always

10 kΩ or higher

(d) Reconnect the H46 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO FRONT PASSENGER DOOR ELECTRICAL KEY ANTENNA)

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

K4-4 (ANT1) - K4-6 (ANT2)

Procedure:

  1. Ignition switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 500 ms./DIV.

Pulse generation

(See waveform 1)

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

Click here

*a

Front view of wire harness connector

(to Front Door Outside Handle Assembly RH)

*b

Waveform 1

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

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

A

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH

B

END (CONNECTOR WAS NOT CONNECTED SECURELY)

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