Lexus NX: Power Back Door cannot be Opened or Closed Using the Back Door Control Switch

Lexus NX Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / Power Back Door cannot be Opened or Closed Using the Back Door Control Switch

DESCRIPTION

When the power back door cannot be closed using the back door control switch, either of the following may be malfunctioning: 1) back door control switch circuit or 2) 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.

READ VALUE USING TECHSTREAM

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

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Body Electrical > Back Door > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

PBD Close SW

Back door control switch signal

ON or OFF

ON: Back door control switch pushed

OFF: Back door control switch not pushed

-

Body Electrical > Back Door > Data List

Tester Display

PBD Close SW

OK:

The back door control switch functions as specified in the normal condition column.

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

2.

INSPECT BACK DOOR CONTROL SWITCH

(a) Remove the back door control switch.

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(b) Inspect the back door control switch.

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NG

REPLACE BACK DOOR CONTROL SWITCH

OK

3.

CHECK HARNESS AND CONNECTOR (BACK DOOR CONTROL SWITCH - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND)

(a) Disconnect the Y28 back door control switch 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

Y28-5 (CLS) - Y26-8 (BDDN)

Always

Below 1 Ω

Y28-2 (E) - Body ground

Always

Below 1 Ω

Y28-5 (CLS) or Y26-8 (BDDN) - Body ground

Always

10 kΩ or higher

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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