Lexus NX: Jam Protection Function Activates During Power Back Door Operation

Lexus NX Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / Jam Protection Function Activates During Power Back Door Operation

DESCRIPTION

When the jam protection function activates during power back door operation, one of the following may be the cause: 1) improper fit of back door, or a foreign object is stuck in the back door, 2) malfunctioning power back door sensor assembly circuit or 3) malfunctioning multiplex network door ECU.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system.

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PROCEDURE

1.

CHECK POWER BACK DOOR SYSTEM

(a) Check if there are any foreign objects interfering with back door operation.

Result

Proceed to

There are no foreign objects

A

There are foreign objects

B

B

REMOVE FOREIGN OBJECT

A

2.

CHECK BACK DOOR OPERATION

(a) Check back door operation.

(1) Turn the main switch so that it is not pushed.

Click here

NOTICE:

This check is possible only when the "Power Back Door Function" customization setting using the multi-information display in the combination meter assembly is set to OFF (initial setting is ON).

(2) Open/close the back door by hand.

Result

Proceed to

The back door fully opens and closes smoothly

A

The back door does not fully open and close smoothly

B

(b) Check main switch condition.

NOTICE:

The "Power Back Door Function" customization setting using the multi-information display in the combination meter assembly is set to ON (initial setting is ON).

(1) Turn the main switch so that it is pushed.

Click here

B

ADJUST BACK DOOR

A

3.

READ VALUE USING TECHSTREAM

(a) Check the Data List to determine if the power back door sensor assembly functions properly.

Click here

Body Electrical > Back Door > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

PBD Touch Sensor (Right)

Power back door sensor assembly RH signal

ON, OFF or Open

ON: Power back door sensor assembly RH pressed

OFF: Power back door sensor assembly RH not pressed

Open: Power back door sensor assembly RH circuit open

-

PBD Touch Sensor (Left)

Power back door sensor assembly LH signal

ON, OFF or Open

ON: Power back door sensor assembly LH pressed

OFF: Power back door sensor assembly LH not pressed

Open: Power back door sensor assembly LH circuit open

-

Body Electrical > Back Door > Data List

Tester Display

PBD Touch Sensor (Right)

PBD Touch Sensor (Left)

Result

Proceed to

On the Techstream screen, ON or OFF is displayed accordingly

A

On the Techstream screen, ON or OFF is not displayed accordingly or Open is displayed for power back door sensor assembly RH

B

On the Techstream screen, ON or OFF is not displayed accordingly or Open is displayed for power back door sensor assembly LH

C

B

GO TO STEP 6

C

GO TO STEP 8

A

4.

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET (LH/RH)

(a) Temporarily replace the power back door unit assembly set with a new or normally functioning one.

Click here

NEXT

5.

CHECK POWER BACK DOOR SYSTEM

(a) Check power back door system operation.

Click here

OK:

Power back door system operates normally

OK

END (POWER BACK DOOR UNIT ASSEMBLY SET WAS DEFECTIVE)

NG

REPLACE MULTIPLEX NETWORK DOOR ECU

6.

INSPECT POWER BACK DOOR SENSOR ASSEMBLY RH

(a) Remove the power back door sensor assembly RH.

Click here

(b) Inspect the power back door sensor assembly RH.

Click here

NG

REPLACE POWER BACK DOOR SENSOR ASSEMBLY RH

OK

7.

CHECK HARNESS AND CONNECTOR (POWER BACK DOOR SENSOR ASSEMBLY RH - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the Y8 power back door sensor assembly RH 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

Y8-1 (OSR) - Y26-6 (OSR)

Always

Below 1 Ω

Y8-2 (OSRE) - Y26-24 (OSE)

Always

Below 1 Ω

Y8-1 (OSR) or Y26-6 (OSR) - Body ground

Always

10 kΩ or higher

Y8-2 (OSRE) or Y26-24 (OSE) - Body ground

Always

10 kΩ or higher

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

INSPECT POWER BACK DOOR SENSOR ASSEMBLY LH

(a) Remove the power back door sensor assembly LH.

Click here

(b) Inspect the power back door sensor assembly LH.

Click here

NG

REPLACE POWER BACK DOOR SENSOR ASSEMBLY LH

OK

9.

CHECK HARNESS AND CONNECTOR (POWER BACK DOOR SENSOR ASSEMBLY LH - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the Y9 power back door sensor assembly LH 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

Y9-1 (OSL) - Y26-26 (OSL)

Always

Below 1 Ω

Y9-2 (OSLE) - Y26-24 (OSE)

Always

Below 1 Ω

Y9-1 (OSL) or Y26-26 (OSL) - Body ground

Always

10 kΩ or higher

Y9-2 (OSLE) or Y26-24 (OSE) - Body ground

Always

10 kΩ or higher

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 Precaution

PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTICE: After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable

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