Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Driver Side Door Entry Lock and Unlock Functions do not Operate

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / 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 door control 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:

  • The smart access system with push-button start (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart access system with push-button start (for Entry Function) after confirming that the communication systems are functioning properly.

    Click here

  • When using the Techstream with the engine 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 Access. 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.
  • Check that there are no electrical key transmitter sub-assemblies in the vehicle.
  • Before replacing the certification ECU (smart key ECU assembly), refer to Precaution.

    Click here

  • After repair, confirm that no DTCs are output.

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 Access > Utility

Tester Display

Operation History
Radio Wave Interference

Parameter Name

Content

Lock / Key RF Signal Interference

When an entry lock operation was performed, the electrical key transmitter sub-assembly could not be confirmed due to wave interference.

If the cause of the malfunction has not been stored but the vehicle has been moved and an entry lock operation has been successfully performed, the possibility of wave interference is high.

Unlock / Key RF Signal Interference

When an entry unlock operation was performed, the electrical key transmitter sub-assembly could not be confirmed due to wave interference.

If the cause of the malfunction has not been stored but the vehicle has been moved and an entry unlock operation has been successfully performed, the possibility of wave interference is high.

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 FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO DIAGNOSTIC TROUBLE CODE CHART

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 (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
B

AFFECTED BY WAVE INTERFERENCE
A

4.

READ VALUE USING TECHSTREAM (D-DOOR TOUCH SENSOR)

(a) Turn the engine switch off.

(b) Open and close the driver door.

(c) 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.

(d) 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.

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

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

(g) Touch the unlock sensor on the backside of the front door outside handle assembly (for driver door).

HINT:

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

Body Electrical > Smart Access > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D-Door Touch Sensor

Driver door touch sensor (unlock sensor)

ON or OFF

ON: Driver door touch sensor (unlock sensor) touched

OFF: Driver door touch sensor (unlock sensor) not 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 Access > 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).

*a

Unlock Sensor (Backside)
NG

GO TO STEP 7

OK

5.

READ VALUE USING TECHSTREAM (D-DOOR TRIGGER SWITCH)

(a) Turn the engine switch off.

(b) Open and close the driver door.

(c) 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.

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

(e) Touch the lock sensor of the front door outside handle assembly (for driver door).

HINT:

  • If the door does not lock even when touching the lock sensor, touch it with your palm.
  • When checking the operation of the lock sensor again, make sure to perform the procedure from step (a).
Body Electrical > Smart Access > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D-Door Trigger Switch

Driver door touch sensor (lock sensor)

ON or OFF

ON: Driver door touch sensor (lock sensor) touched

OFF: Driver door touch sensor (lock sensor) not 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 Access > Data List

Tester Display

D-Door Trigger Switch

HINT:

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.

OK:

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

*a

Lock Sensor
NG

GO TO STEP 7

OK

6.

CHECK KEY DIAGNOSTIC MODE

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

Body Electrical > Smart Access > 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
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

A

7.

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

(a) Disconnect the R1 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the N11 front door outside handle assembly (for driver door) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R1-17 (CLG1) - N11-4 (ANT1)

Always

Below 1 Ω

R1-16 (CG1B) - N11-5 (ANT2)

Always

Below 1 Ω

R1-17 (CLG1) or N11-4 (ANT1) - Body ground

Always

10 kΩ or higher

R1-16 (CG1B) or N11-5 (ANT2) - Body ground

Always

10 kΩ or higher

(d) Reconnect the R1 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

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

N11-4 (ANT1) - N11-5 (ANT2)

Procedure:

  1. Engine 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., 100 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 (for Driver Door))

*b

Waveform 1
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

9.

CHECK ENTRY LOCK 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
B

END (CONNECTOR WAS NOT CONNECTED SECURELY)
A

10.

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

NEXT

11.

CHECK ENTRY LOCK 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 (FOR DRIVER DOOR) WAS DEFECTIVE)
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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