Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: PBD Unit Pulse Sensor LH Circuit (B2226)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Door / Hatch / Power Back Door System (w/ Outside Door Control Switch) / PBD Unit Pulse Sensor LH Circuit (B2226)

DESCRIPTION

This DTC is stored when the multiplex network door ECU detects an error in the power back door unit assembly set LH pulse signal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2226

PBD Unit Pulse Sensor LH Circuit

Multiplex network door ECU detects power back door unit assembly set LH pulse malfunction
  • Multiplex network door ECU
  • Power back door unit assembly set LH
  • 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 B2226 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

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

(a) Disconnect the Z16 multiplex network door ECU connector.

(b) Disconnect the Z18 power back door unit assembly set LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z16-21 (DSG) - Z18-4 (DSG)

Always

Below 1 Ω

Z16-25 (DSV) - Z18-3 (DSV)

Always

Below 1 Ω

Z16-2 (DS2) - Z18-6 (DS2)

Always

Below 1 Ω

Z16-1 (DS1) - Z18-5 (DS1)

Always

Below 1 Ω

Z16-21 (DSG) or Z18-4 (DSG) - Body ground

Always

10 kΩ or higher

Z16-25 (DSV) or Z18-3 (DSV) - Body ground

Always

10 kΩ or higher

Z16-2 (DS2) or Z18-6 (DS2) - Body ground

Always

10 kΩ or higher

Z16-1 (DS1) or Z18-5 (DS1) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK MULTIPLEX NETWORK DOOR ECU

(a) Reconnect 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

Z18-4 (DSG) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Power Back Door Unit Assembly Set LH)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Z18-5 (DS1) - Body ground

Always

7 V or higher

Z18-6 (DS2) - Body ground

Always

7 V or higher

Z18-3 (DSV) - Body ground

Always

7 V or higher
NG

REPLACE MULTIPLEX NETWORK DOOR ECU

OK

4.

CHECK POWER BACK DOOR UNIT ASSEMBLY SET LH

(a) Reconnect the Z18 power back door unit assembly set LH connector.

(b) Using an oscilloscope, check the waveform of each terminal from the rear of the multiplex network door ECU Z16 connector.

*a

Component with harness connected

(Multiplex Network Door ECU)

*b

Waveform (CH1)

*c

Waveform (CH2)

-

-

Measurement Condition:

Item

Condition

Tester Connection
  • CH1: Z16-1 (DS1) - Body ground
  • CH2: Z16-2 (DS2) - Body ground

Tool setting

2 V/DIV., 2 ms/DIV.

Vehicle condition

Open and close the back door by hand.

HINT:

The period changes in accordance to the speed at which the back door is opened and closed by hand.

OK:

The waveform displayed is as shown in the illustration.

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET LH

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