Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Power Back Door cannot be Operated Using Kick Sensor

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Door / Hatch / Power Back Door System (w/ Outside Door Control Switch) / Power Back Door cannot be Operated Using Kick Sensor

DESCRIPTION

The kick door control sensor turns the sensing circuit on or off based on the vehicle speed and IG and ACC signals sent from the main body ECU (multiplex network body ECU) via LIN communication.

When the kick door control sensor detects a kick operation, it sends an operation signal to the multiplex network door ECU.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before troubleshooting, make sure that the "Kick Sensor Function" customize setting is set to "ON" (The default is "ON").

    Click here

  • The power back door system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power back door system after confirming that the CAN communication system is functioning properly.

    Click here

  • Check the smart access system (for Entry Function) first before troubleshooting the power back door system.

    Click here

  • Before troubleshooting, be sure to read Precautions for Hands Free Power Back Door.

    Click here

  • If the multiplex network door ECU has been removed and installed or replaced, or if any of the connectors have been disconnected, initialize the power back door system.

    Click here

  • After performing work, using the Techstream, read the Data List item "Kick Sensor Connection" and check that the kick door control sensor is connected.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK FOR DTC

(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 / Back Door / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Back Door > Trouble Codes

OK:

DTC is not output.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

2.

READ VALUE USING TECHSTREAM

(a) Enter the following menus: Body Electrical / Back Door / Data List.

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

Body Electrical > Back Door > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Kick Sensor Error

Status of the kick door control sensor error

Normal or Error

Normal: Kick door control sensor is normal

Error: Kick door control sensor is abnormal

-
Body Electrical > Back Door > Data List

Tester Display

Kick Sensor Error

OK:

On the display, Normal is displayed.

NG

REPLACE KICK DOOR CONTROL SENSOR

OK

3.

READ VALUE USING TECHSTREAM

(a) Enter the following menus: Body Electrical / Back Door / Data List.

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

Body Electrical > Back Door > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Kick Sensor Detection

Status of the kick door control sensor detection

OFF or ON

OFF: Kick door control sensor not detecting a foot

ON: Kick door control sensor detecting a foot

-
Body Electrical > Back Door > Data List

Tester Display

Kick Sensor Detection

OK:

The display is as specified in the normal condition column.

NG

GO TO STEP 5

OK

4.

CHECK HARNESS AND CONNECTOR (KICK DOOR CONTROL SENSOR - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the Y9 kick door control sensor connector.

(b) Disconnect the 2B instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y9-2 (LIN) - 2B-17

Always

Below 1 Ω
OK

REPLACE KICK DOOR CONTROL SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (KICK DOOR CONTROL SENSOR - BATTERY AND BODY GROUND)

(a) Disconnect the Y9 kick door control sensor connector.

*a

Front view of wire harness connector

(to Kick Door Control Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y9-4 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Y9-1 (B) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (KICK DOOR CONTROL SENSOR - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the Z16 multiplex network door ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y9-3 (KSOT) - Z16-14 (KSIN)

Always

Below 1 Ω

Y9-3 (KSOT) or Z16-14 (KSIN) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK MULTIPLEX NETWORK DOOR ECU

(a) Remove the multiplex network door ECU with the connector(s) still connected.

Click here

(b) Check the signal waveform according to the condition(s) in the table below.

Measurement Condition

Item

Condition

Tester Connection

Z16-14 (KSIN) - Body ground

Tool Setting

2 V/DIV., 50 ms/DIV.

Vehicle Condition

Kick door control sensor not detecting a foot

OK:

The waveform displayed is as shown in the illustration.

*a

Component with harness connected

(Multiplex Network Door ECU)

*b

Waveform
OK

REPLACE KICK DOOR CONTROL SENSOR

NG

REPLACE MULTIPLEX NETWORK DOOR ECU

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