Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Back Door Closer does not Operate

DESCRIPTION

If the back door closer does not operate, one of the following may be the cause: 1) improper fit of the back door or a foreign object stuck in the back door, 2) a malfunction in the multiplex network door ECU power source circuit, 3) a malfunction in the back door lock assembly circuit, 4) initialization of the multiplex network door ECU has not been performed or 5) a multiplex network door ECU malfunction.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the multiplex network door ECU has been removed and installed or replaced, or if any of the connectors have been disconnected, initialize the power back door system.

    Click here

PROCEDURE

1.

CHECK FOR DTC

(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 / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Back Door > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC B2250 is output

B

DTC B2251 is output

C

B

GO TO DTC B2250

C

GO TO DTC B2251

A

2.

CHECK BACK DOOR LOCK FUNCTION

(a) Check if the back door can be fully closed by hand.

Result

Proceed to

The back door can be closed normally

A

The back door cannot be closed normally

B

B

IMPROPER FIT OF BACK DOOR, OR A FOREIGN OBJECT IS STUCK IN BACK DOOR

A

3.

INITIALIZE POWER BACK DOOR SYSTEM

(a) Perform initialize the power back door system.

Click here

NEXT

4.

CHECK BACK DOOR CLOSER

(a) When the back door is partially closed, check that the motor operates to fully close the back door.

Result

Proceed to

The back door closer operates normally

A

The back door closer operates not normally

B

A

END (BACK DOOR CLOSER HAS NOT BEEN INITIALIZED)

B

5.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z17-10 (GND) - Body ground

Always

Below 1 Ω

*a

Rear view of wire harness connector

(to Multiplex Network Door ECU)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Z16-20 (ECUB) - Body ground

Always

11 to 14 V

Z17-1 (B) - Body ground

Always

11 to 14 V

Z16-18 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly.

Click here

(b) Inspect the back door lock assembly.

Click here

NG

REPLACE BACK DOOR LOCK ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND)

(a) Disconnect the Z16 and Z17 multiplex network door ECU connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z7-4 (M+) - Z17-4 (DC+)

Always

Below 1 Ω

Z7-1 (M-) - Z17-3 (DC-)

Always

Below 1 Ω

Z7-8 (CTY) - Z16-11 (FUL)

Always

Below 1 Ω

Z7-2 (FSW) - Z16-13 (PAWL)

Always

Below 1 Ω

Z7-3 (CLS) - Z16-9 (HAF)

Always

Below 1 Ω

Z7-6 (OPN) - Z16-7 (POS)

Always

Below 1 Ω

Z7-7 (E) - Body ground

Always

Below 1 Ω

Z7-4 (M+) or Z17-4 (DC+) - Body ground

Always

10 kΩ or higher

Z7-1 (M-) or Z17-3 (DC-) - Body ground

Always

10 kΩ or higher

Z7-8 (CTY) or Z16-11 (FUL) - Body ground

Always

10 kΩ or higher

Z7-2 (FSW) or Z16-13 (PAWL) - Body ground

Always

10 kΩ or higher

Z7-3 (CLS) or Z16-9 (HAF) - Body ground

Always

10 kΩ or higher

Z7-6 (OPN) or Z16-7 (POS) - Body ground

Always

10 kΩ or higher

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Lost Communication With TCM (U0101,U0122,U0142,U0155,U0327,U1117)
    DESCRIPTION These DTCs are stored when a malfunction occurs in the CAN communication system. DTC No. Detection Item DTC Detection Condition Trouble Area U0101 Lost Communication With TC ...

    Power Back Door cannot be Operated Using Any Switch
    DESCRIPTION If the power back door system cannot be operated using any switch, the multiplex network door ECU may not have been initialized, or there may be a malfunction in the power back door sensor ...

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