Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Power Back Door does not Operate Using Outside Switch

DESCRIPTION

The multiplex network door ECU detects the status of the power back door control switch.

If the power back door does not operate when the power back door control switch is operated, there may be a malfunction in the power back door control switch circuit.

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) 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 / Master Switch / Data List.

(e) 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

PBD Close SW

Back door control switch signal

OFF or ON

OFF: Back door control switch not pressed

ON: Back door control switch pressed

-

Body Electrical > Back Door > Data List

Tester Display

PBD Close SW

OK:

The display is 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 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

Z29-5 (CLS) - Z16-8 (BDDN)

Always

Below 1 Ω

Z29-2 (E) - Body ground

Always

Below 1 Ω

Z29-5 (CLS) or Z16-8 (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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