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

DESCRIPTION

If the entry lock and unlock functions do not operate for the back door only, the request code may not be being transmitted from the back door. 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 electrical key antenna (outside luggage compartment)) 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 back door entry lock and unlock function does 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 back door lock and unlock according to the switch operation.

Click here

OK:

Back door lock/unlock operate normally.

NG

GO TO POWER DOOR LOCK CONTROL SYSTEM

OK

2.

CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the electrical key antenna (outside luggage compartment) and perform an entry back door open/lock function check.

Click here

HINT:

  • Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the electrical key antenna (outside luggage compartment)
  • When the electrical key transmitter sub-assembly is brought near the electrical key antenna (outside luggage compartment), 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.

*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

3.

READ VALUE USING GTS (TRUNK LID/BACK DOOR LOCK SWITCH, TRUNK LID/BACK DOOR UNLOCK SWITCH)

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

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Trunk Lid/Back Door Lock Switch

Back door opener switch assembly (lock switch)

OFF or ON

OFF: Back door opener switch assembly (lock switch) not pressed

ON: Back door opener switch assembly (lock switch) pressed
  • Displays whether the back door opener switch assembly (lock switch) is on or off.
  • Use this Data List item to help determine if there is a switch malfunction when the back door lock function does not operate.

Trunk Lid/Back Door Unlock Switch

Back door opener switch assembly (open switch)

OFF or ON

OFF: Back door opener switch assembly (open switch) not pressed

ON: Back door opener switch assembly (open switch) pressed
  • Displays whether the back door opener switch assembly is on or off.
  • Use this Data List item to help determine if there is a switch malfunction when the entry back door open function does not operate.
Body Electrical > Smart Key > Data List

Tester Display

Trunk Lid/Back Door Lock Switch

Trunk Lid/Back Door Unlock Switch

OK:

The GTS display changes correctly in response to the operation of the back door opener switch assembly.

NG

GO TO STEP 8

OK

4.

CHECK KEY DIAGNOSTIC MODE

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

Body Electrical > Entry&Start > Utility

Tester Display

Communication Check(Key Diag Mode)

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

(1) 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.

*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

5.

CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the O47 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the O45 electrical key antenna (outside luggage compartment) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O47-4 (CLG8) - O45-2 (ANTE8)

Always

Below 1 Ω

O47-3 (CG8B) - O45-1 (CLGB)

Always

Below 1 Ω

O47-4 (CLG8) or O45-2 (ANTE8) - Other terminals and body ground

Always

10 kΩ or higher

O47-3 (CG8B) or O45-1 (CLGB) - Other terminals and body ground

Always

10 kΩ or higher

(d) Reconnect the O47 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

O45-1 (CLGB) - O45-2 (ANTE8)

Procedure:

  1. Ignition switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. Back door opener switch assembly off → on

5 V/DIV., 50 ms./DIV.

Pulse generation

(See waveform 1)

*a

Front view of wire harness connector

(to Electrical Key Antenna (Outside Luggage Compartment))

*b

Waveform 1
OK

REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)

NG

7.

CHECK ENTRY OPERATION

(a) Connect all connectors and 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 (CONNECTOR WAS NOT CONNECTED SECURELY)
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

8.

CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)

(a) Disconnect the O47 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the Y8 back door opener switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O47-16 (TSW5) - Y8-3 (UL)

Always

Below 1 Ω

O47-17 (TSW6) - Y8-1 (L)

Always

Below 1 Ω

Y8-2 (E) - Other terminals and body ground

Always

Below 1 Ω

O47-16 (TSW5) or Y8-3 (UL) - Other terminals and body ground

Always

10 kΩ or higher

O47-17 (TSW6) or Y8-1 (L) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

INSPECT BACK DOOR OPENER SWITCH ASSEMBLY

Click here

NG

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY

OK

10.

CHECK ENTRY OPERATION

(a) Connect all connectors and 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 (CONNECTOR WAS NOT CONNECTED SECURELY)
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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