Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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.

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.

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PROCEDURE

(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.

(f) Recheck for DTCs.

OK:

DTC B2226 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

(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:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(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:

NG

REPLACE MULTIPLEX NETWORK DOOR ECU

OK

(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.

Measurement Condition:

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