Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Back Door Motor Circuit (B2220)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Door / Hatch / Power Back Door System (w/ Outside Door Control Switch) / Back Door Motor Circuit (B2220)

DESCRIPTION

This DTC is stored when the multiplex network door ECU detects a malfunction of the motor built-into the power back door unit assembly set LH or power back door unit assembly set RH.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2220

Back Door Motor Circuit

Malfunction of motor built into the power back door unit assembly set LH or power back door unit assembly set RH detected
  • Multiplex network door ECU
  • Power back door unit assembly set LH
  • Power back door unit assembly set RH
  • Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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) Clear the DTCs.

Body Electrical > Back Door > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Back Door > Trouble Codes

OK:

DTC B2220 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

INSPECT POWER BACK DOOR UNIT ASSEMBLY SET LH

(a) Fully open the back door.

(b) Disconnect the power back door unit assembly set LH connector.

*a

Component without harness connected

(Power Back Door Unit Assembly Set LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - Body ground

Always

10 kΩ or higher

2 - Body ground

Always

10 kΩ or higher

1 - 2

Always

Below 1 MΩ
NG

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET LH

OK

3.

INSPECT POWER BACK DOOR UNIT ASSEMBLY SET RH

(a) Fully open the back door.

(b) Disconnect the power back door unit assembly set RH connector.

*a

Component without harness connected

(Power Back Door Unit Assembly Set RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - Body ground

Always

10 kΩ or higher

2 - Body ground

Always

10 kΩ or higher

1 - 2

Always

Below 1 MΩ
NG

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET RH

OK

4.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - POWER BACK DOOR UNIT ASSEMBLY SET LH)

(a) Disconnect the Z17 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

Z17-7 (BD+) - Z18-1 (BD+)

Always

Below 1 Ω

Z17-6 (BD-) - Z18-2 (BD-)

Always

Below 1 Ω

Z17-7 (BD+) or Z18-1 (BD+) - Body ground

Always

10 kΩ or higher

Z17-6 (BD-) or Z18-2 (BD-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - POWER BACK DOOR UNIT ASSEMBLY SET RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z17-8 (BD+2) - Z19-1 (BD+2)

Always

Below 1 Ω

Z17-9 (BD-2) - Z19-2 (BD-2)

Always

Below 1 Ω

Z17-8 (BD+2) or Z19-1 (BD+2) - Body ground

Always

10 kΩ or higher

Z17-9 (BD-2) or Z19-2 (BD-2) - Body ground

Always

10 kΩ or higher
OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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