Toyota Yaris: Smart Key System (for Entry Function) / Driver Side Door Entry Unlock Function does not Operate

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

DESCRIPTION

If the entry unlock function does not operate for the driver door only, but the entry lock function operates, the request code is being transmitted properly from the driver door. In this case, there may be a problem related to the unlock sensor (connection between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH).

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.

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 that the entry unlock function.

(1) Turn the ignition switch off.

*a

Unlock Sensor (Backside)

(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 LH 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 LH 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).

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.

READ VALUE USING GTS (FL DOOR LOCK POSITION SWITCH STATUS)

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FL Door Lock Position Switch Status

Front door LH unlock detection switch signal

Lock or Unlock

Lock: Front door LH locked

Unlock: Front door LH unlocked

-
Body Electrical > Main Body > Data List

Tester Display

FL Door Lock Position Switch Status

OK:

The GTS display changes correctly in response to the lock/unlock operation of the driver door.

NG

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

OK

4.

READ VALUE USING GTS (DRIVER SIDE UNLOCK SENSOR)

(a) Open and close the driver 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 LH and approximately 0.3 m (0.984 ft.) from the driver 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 LH 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

Driver Side Unlock 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

Driver Side Unlock Sensor

OK:

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

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

5.

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

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

(b) Disconnect the L4 front door outside handle assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H46-16 (CLG1) - L4-4 (ANT1)

Always

Below 1 Ω

H46-15 (CG1B) - L4-6 (ANT2)

Always

Below 1 Ω

H46-16 (CLG1) or L4-4 (ANT1) - Other terminals and body ground

Always

10 kΩ or higher

H46-15 (CG1B) or L4-6 (ANT2) - Other terminals and body ground

Always

10 kΩ or higher

(d) Reconnect the L4 front door outside handle assembly LH connector.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

READ VALUE USING GTS (DRIVER SIDE UNLOCK SENSOR)

(a) Open and close the driver 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 LH and approximately 0.3 m (0.984 ft.) from the driver 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 LH 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

Driver Side Unlock 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

Driver Side Unlock Sensor

OK:

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

OK

END (CONNECTOR WAS NOT CONNECTED SECURELY)
NG

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH

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