Toyota 4Runner: Back Door Power Window Switch ON Stuck (B2312)

Toyota 4Runner Service Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Back Door Power Window Switch ON Stuck (B2312)

DESCRIPTION

This DTC is stored when the back door power window regulator motor is stuck.

NOTICE:

When a power window regulator is reinstalled or replaced, the power window control system must be initialized.

Back Door P/W

DTC Code	DTC Detection Condition	Trouble Area
B2312	The back door power window regulator motor is stuck.	Multiplex network door ECU (Back door P/W) Back door power window regulator motor Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTC (See page ).

(b) Check for DTCs (See page ).

Result

Result	Proceed to
No DTCs output	A
DTC B2312 is output	B

END

2.	CHECK MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

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

Standard Voltage:

Tester Connection	Tool Setting	Switch Condition	Specified Condition
W10-14 (BUP2) - W10-1 (E4)	2 V/DIV., 100 ms/DIV.	Ignition switch ON, back door power window regulator switch up	Pulse generation (See waveform 1
W10-13 (BDN2) - W10-1 (E4)	2 V/DIV., 100 ms/DIV.	Ignition switch ON, back door power window regulator switch down	Pulse generation (See waveform 1)
W10-12 (AUT2) - W10-1 (E4)	2 V/DIV., 100 ms/DIV.	Ignition switch ON, back door power window auto up or auto down function operating	Pulse generation (See waveform 2)

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

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

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

(b) Disconnect the W10 multiplex network door ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W9-10 (UP) - V10-14 (BUP2)	Always	Below 1 Ω
W9-7 (DOWN) - V10-13 (BDN2)	Always	Below 1 Ω
W9-4 (AUTO) - V10-12 (AUT2)	Always	Below 1 Ω
W9-1 (GND) - V10-1 (E4)	Always	Below 1 Ω
W9-10 (UP) - Body ground	Always	10 kΩ or higher
W9-7 (DOWN) - Body ground	Always	10 kΩ or higher
W9-4 (AUTO) - Body ground	Always	10 kΩ or higher
W9-1 (GND) - Body ground	Always	10 kΩ or higher

REPLACE BACK DOOR POWER WINDOW REGULATOR MOTOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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