Lexus NX: Power Back Door cannot be Operated Using Kick Sensor

Lexus NX Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / Power Back Door cannot be Operated Using Kick Sensor

DESCRIPTION

The kick door control sensor receives vehicle speed, IG and ACC signals from the main body ECU (multiplex network body ECU) via LIN communication and uses the information to stop sensor oscillation.

When the kick door control sensor detects a kick operation, it sends a 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".

    Click here

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

    Click here

  • If the multiplex network door ECU has been removed and installed or replaced, or if any of the connectors has 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

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Back Door > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

READ VALUE USING TECHSTREAM

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

Click here

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 Techstream, Normal is displayed.

NG

REPLACE KICK DOOR CONTROL SENSOR

OK

3.

READ VALUE USING TECHSTREAM

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

Click here

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:

On Techstream screen, item changes between ON and OFF according to above chart.

NG

GO TO STEP 5

OK

4.

CHECK HARNESS AND CONNECTOR (KICK DOOR CONTROL SENSOR - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the W9 kick door control sensor connector.

(b) Disconnect the 4D driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-2 (LIN) - 4D-41

Always

Below 1 Ω

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

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

(a) Disconnect the kick door control sensor connector.

*a

Front view of wire harness connector

(to Kick Door Control Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-4 (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

W9-1 (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 AND BODY GROUND)

(a) Disconnect the W9 kick door control sensor connector.

(b) Disconnect the Y26 multiplex network door ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-3 (KSOT) - Y26-14 (KSIN)

Always

Below 1 Ω

W9-3 (KSOT) or Y26-14 (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

Y26-14 (KSIN) - Body ground

Tool Setting

2 V/DIV., 50 ms./DIV.

Vehicle Condition

Power switch on (IG), 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)

OK

REPLACE KICK DOOR CONTROL SENSOR

NG

REPLACE MULTIPLEX NETWORK DOOR ECU

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