Lexus NX: Power Back Door cannot be Operated Using Any Switch

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

DESCRIPTION

When the power back door cannot be operated using any switch, one of the following may be the cause: 1) initialization of the multiplex network door ECU, 2) power back door sensor assembly circuit, 3) power back door ON/OFF signal circuit, 4) back door closer system, 5) meter / gauge system, 6) multiplex network door ECU power source circuit or 7) multiplex network door ECU.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this problem.

    Click here

  • Inspect fuses for circuits related to this system before performing the following inspection procedure.
  • 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 ON (initial setting is ON).

    Click here

  • 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.

    Click here

PROCEDURE

1.

INITIALIZE MULTIPLEX NETWORK DOOR ECU

(a) Perform the initialization for the multiplex network door ECU.

Click here

NEXT

2.

CHECK POWER BACK DOOR SYSTEM

(a) Check that the power back door hazard warning lights operate normally.

Click here

OK:

The power back door system operate normally

OK

END (POWER BACK DOOR SYSTEM HAS NOT BEEN INITIALIZED)

NG

3.

CHECK BACK DOOR CLOSER SYSTEM

(a) Check back door closer system operation.

Click here

OK:

Back door closer system operates normally

NG

GO TO BACK DOOR CLOSER SYSTEM

OK

4.

CHECK COMBINATION METER ASSEMBLY

(a) With the vehicle stopped and hybrid control system started, check the shift position indicator operation and that the speedometer indicates 0 km/h (0 mph).

OK:

Combination meter operates normally

NG

GO TO METER / GAUGE SYSTEM

OK

5.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Back Door > Trouble Codes

OK:

DTC is not output

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

6.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND)

(a) Disconnect the multiplex network door ECU connectors.

*a

Rear view of wire harness connector

(to Multiplex Network Door ECU)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y27-10 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Y26-20 (ECUB) - Body ground

Power switch off

11 to 14 V

Y27-1 (B) - Body ground

Power switch off

11 to 14 V

Y26-18 (IG) - Body ground

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

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

PBD Main SW

Power back door ON/OFF signal

ON or OFF

Current customize setting displayed

-

Body Electrical > Back Door > Data List

Tester Display

PBD Main SW

OK:

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

NG

GO TO METER / GAUGE SYSTEM

OK

8.

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

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

A

REPLACE MULTIPLEX NETWORK DOOR ECU

C

GO TO STEP 11

B

9.

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

10.

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

11.

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

12.

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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