Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Front Passenger Side Door Entry Unlock Function does 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) / Front Passenger Side Door Entry Unlock Function does not Operate

DESCRIPTION

If the entry unlock function does not operate for the front passenger door only, but the entry lock function operates, the request code is being transmitted properly from the front passenger 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 (for front passenger door)).

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.

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.

READ VALUE USING TECHSTREAM (FR DOOR LOCK POS)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Door Lock Pos

Front door RH unlock detection switch signal

UNLOCK or LOCK

UNLOCK: Front door RH unlocked

LOCK: Front door RH locked

-
Body Electrical > Main Body > Data List

Tester Display

FR Door Lock Pos

OK:

The Techstream display changes correctly in response to the lock/unlock operation of the front passenger door.

NG

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

OK

3.

READ VALUE USING TECHSTREAM (P-DOOR TOUCH SENSOR)

(a) Turn the engine switch off.

(b) Open and close the front passenger 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 front passenger 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 front passenger 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

P-Door Touch Sensor

Front passenger door touch sensor (unlock sensor)

ON or OFF

ON: Front passenger door touch sensor (unlock sensor) touched

OFF: Front passenger 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

P-Door Touch Sensor

OK:

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

*a

Unlock Sensor (Backside)
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

4.

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

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

(b) Disconnect the M11 front door outside handle assembly (for front passenger door) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R1-15 (CLG2) - M11-4 (ANT1)

Always

Below 1 Ω

R1-14 (CG2B) - M11-5 (ANT2)

Always

Below 1 Ω

R1-15 (CLG2) or M11-4 (ANT1) - Body ground

Always

10 kΩ or higher

R1-14 (CG2B) or M11-5 (ANT2) - Body ground

Always

10 kΩ or higher

(d) Reconnect the M11 front door outside handle assembly (for front passenger door) connector.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER DOOR) (INPUT TO CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

*b

Waveform 1

*c

Unlock sensor not touched

*d

Unlock sensor touched

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

R1-15 (CLG2) - J41-18 (E)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors locked
  4. Electrical key transmitter sub-assembly not near the vehicle
  5. Front passenger door unlock sensor touched

5 V/DIV., 50 ms/DIV.

Pulse generation

(See waveform 1)
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER DOOR)

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