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

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Door / Hatch / Power Back Door System (w/ Outside Door Control Switch) / Power Back Door does not Operate Using Cabin Switch

DESCRIPTION

The power back door switch (integration control and panel assembly) signal is sent to the multiplex network door ECU via CAN communication.

If the power back door does not operate when the power back door switch (integration control and panel assembly) is operated, there may be a malfunction in the power back door switch (integration control and panel assembly) circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The power back door system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power back door system after confirming that the CAN communication system is functioning properly.

    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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Back Door Open SW

Power back door switch (integration control and panel assembly) signal

OFF or ON

OFF: Power back door switch (integration control and panel assembly) off

ON: Power back door switch (integration control and panel assembly) on

-
Body Electrical > Main Body > Data List

Tester Display

Back Door Open SW

OK:

The display is as specified in the normal condition column.

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

2.

INSPECT POWER BACK DOOR SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Remove the power back door switch (integration control and panel assembly).

Click here

(b) Inspect the power back door switch (integration control and panel assembly).

Click here

NG

REPLACE POWER BACK DOOR SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - MAIN BODY ECU (MULTIPLAX NETWORK BODY ECU))

(a) Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J83-4 (B) - J9-5 (PBDS)

Always

Below 1 Ω

J83-14 (L) - Body ground

Always

Below 1 Ω

J83-4 (B) or J9-5 (PBDS) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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