Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Lock Function does not Operate (Close &)

DESCRIPTION

The door control switch signal is sent to the multiplex network door ECU. If the power back door system does not operate when the door control switch is operated, the door control switch circuit may be malfunctioning.

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.

    Click here

  • Check the smart access system (for Entry Function) first before troubleshooting the power back door system.

    Click here

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 / Back Door / 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

Close and Lock SW

Door control switch signal

OFF or ON

OFF: Door control switch not pushed

ON: Door control switch pushed

-

Body Electrical > Back Door > Data List

Tester Display

Close and Lock SW

OK:

The display is as specified in the normal condition column.

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

2.

INSPECT DOOR CONTROL SWITCH

(a) Remove the door control switch.

Click here

(b) Inspect the door control switch.

Click here

NG

REPLACE DOOR CONTROL SWITCH

OK

3.

CHECK HARNESS AND CONNECTOR (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

Z30-5 (CLLS) - Z16-10 (CLSW)

Always

Below 1 Ω

Z30-2 (E) - Body ground

Always

Below 1 Ω

Z30-5 (CLLS) or Z16-10 (CLSW) - Body ground

Always

10 kΩ or higher

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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