Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Entry Unlock and Unlatch Functions do not Operate Using Kick Sensor

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / Entry Unlock and Unlatch Functions do not Operate Using Kick Sensor

DESCRIPTION

If the hands free power back door operation does not operate, it could indicate the certification ECU (smart key ECU assembly) did not transmit a power back door open request signal, or a malfunction in the power back door system.

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.

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  • 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.
  • Before replacing the certification ECU (smart key ECU assembly), refer to smart access system with push-button start (for Entry Function) Precaution.

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  • After repair, confirm that no DTCs are output by performing the "DTC Output Confirmation Operation".

PROCEDURE

1.

CHECK CUSTOMIZE SETTING (KICK SENSOR FUNCTION)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Customize Setting / PSD & PBD operation.

PSD & PBD operation

Tester Display

Description

Default

Setting

ECU

Kick Sensor Function

Function that enables/disables the hands free power back door.

ON

0:OFF,1:ON

Multiplex network door ECU

Kick Sensor Operation with ACC ON

Status of the hands free power back door function with engine switch on (ACC).

Available

0:Available,1:Not Available

Main body ECU (Multiplex network body ECU)

Result

Proceed to

The customize setting is "ON" and "Available"

A

The customize setting is "OFF" or "Available"

B
B

PERFORM CUSTOMIZE SETTING

A

2.

CHECK OPERATION HISTORY

(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 / Smart Access / Utility / Operation History.

Body Electrical > Smart Access > Utility

Tester Display

Operation History
Auto Entry Wireless Operation History

Parameter Name

Content

Kick Sensor Open Request Signal.

The multiplex network door ECU receives kick detection signals from the kick door control sensor and sends certification requests to the certification ECU (smart key ECU assembly). If certification is OK, an open permission is sent to the multiplex network door ECU.

Result

Proceed to

Not output

A

"Kick Sensor Open Request Signal" is output

B
B

GO TO POWER BACK DOOR SYSTEM

A

3.

CHECK ENTRY BACK DOOR OPEN FUNCTION

(a) While carrying the electrical key transmitter sub-assembly, check that the entry unlock function operates when the back door opener switch assembly is operated.

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Result

Proceed to

Entry back door open function operates

A

Entry back door open function does not operate

B
A

GO TO POWER BACK DOOR SYSTEM (Power Back Door cannot be Operated Using Kick Sensor)

B

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (Back Door Entry Lock and Unlock Functions do not Operate)

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