Toyota 4Runner: Lost Communication with Back Door Power Window ECU (Abnormal Power Supply) (B2327,B2328)

Toyota 4Runner Service Manual / Power Source / Network / Networking / Lin Communication System / Lost Communication with Back Door Power Window ECU (Abnormal Power Supply) (B2327,B2328)

DESCRIPTION

DTC B2327 is stored when LIN communication between the multiplex network door ECU (back door P/W) and back door power window regulator motor assembly stops for 10 seconds or more.

DTC B2328 is stored when a malfunction in the LIN communication bus between the multiplex network door ECU (back door P/W) and back door power window regulator motor assembly is detected consecutively 3 times.

DTC Code	DTC Detection Condition	Trouble Area
B2327	No communication between the multiplex network door ECU (back door P/W) and back door power window regulator motor assembly for 10 seconds or more.	Multiplex network door ECU (back door P/W) Back door power window regulator motor assembly Harness or connector
B2328	The multiplex network door ECU (back door P/W) detects a malfunction in the LIN communication bus between the multiplex network door ECU (back door P/W) and back door power window regulator motor assembly consecutively 3 times.	Multiplex network door ECU (back door P/W) Back door power window regulator motor assembly Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the ignition switch off to troubleshoot:

Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs (See page ).

2.	CHECK FOR DTC

(a) Check for DTCs (See page ).

OK:

DTC B2327 or B2328 is not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BACK DOOR POWER WINDOW REGULATOR MOTOR)

(a) Disconnect the W10 multiplex network door ECU (back door P/W) connector.

(b) Disconnect the W9 back door power window regulator motor assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W10-11 (MPX2) - W9-9 (LIN)	Always	Below 1 Ω
W10-6 (BDR2) - W9-2 (B)	Always	Below 1 Ω
W10-1 (E4) - W9-1 (GND)	Always	Below 1 Ω
W10-1 (E4) - Body ground	Always	Below 1 Ω
W9-1 (GND) - Body ground	Always	Below 1 Ω
W10-11 (MPX2) or W9-9 (LIN) - Body ground	Always	10 kΩ or higher
W10-6 (BDR2) or W9-2 (B) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE BACK DOOR POWER WINDOW REGULATOR MOTOR ASSEMBLY

(a) Temporarily replace the back door power window regulator motor assembly with a new or normally functioning one (See page ).

CLEAR DTC

(a) Clear the DTCs (See page ).

6.	CHECK FOR DTC

(a) Check for DTCs (See page ).

OK:

DTC B2327 or B2328 is not output.

END (BACK DOOR POWER WINDOW REGULATOR MOTOR IS DEFECTIVE)

REPLACE MULTIPLEX NETWORK DOOR ECU

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