Toyota Yaris: Power Window Control System / Power Window Switch Malfunction (B2312)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Power Window Switch Malfunction (B2312)

DESCRIPTION

The power window regulator motor assemblies are operated by the multiplex network master switch assembly or power window regulator switch assembly. The power window regulator motor assemblies have motor, regulator and ECU functions.

This DTC is stored when the ECU built into a power window regulator motor assembly and multiplex network master switch assembly determine that the multiplex network master switch assembly or power window regulator switch assembly is stuck.

Master Switch

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2312

Power Window Switch Malfunction
  • Multiplex network master switch assembly stuck
  • Multiplex network master switch assembly held in same position for more than 20 seconds
  • Multiplex network master switch assembly operated for 20 seconds or more

Multiplex network master switch assembly

Master Switch
D-Door Motor

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2312

Power Window Switch Malfunction
  • Multiplex network master switch assembly stuck
  • Multiplex network master switch assembly held in same position for more than 20 seconds
  • Multiplex network master switch assembly
  • Power window regulator motor assembly (for driver door)
  • Wire harness or connector

D-Door Motor
P-Door Motor

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2312

Power Window Switch Malfunction
  • Power window regulator switch assembly stuck
  • Power window regulator switch assembly held in same position for more than 20 seconds
  • Power window regulator switch assembly
  • Power window regulator motor assembly (for front passenger door)
  • Wire harness or connector

P-Door Motor

WIRING DIAGRAM

Refer to DTC B2311.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • DTC B2312 is stored in the multiplex network master switch assembly and in each power window regulator motor assembly.
  • If a power window regulator motor assembly has been replaced with a new one, initialize the power window control system.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • The power window control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication system is functioning properly.

    Click here

HINT:

If DTC B2312 is not output again after the DTC has been cleared, the DTC was stored due to the switch being held in the same position continuously.

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Master Switch > Trouble Codes Body Electrical > D-Door Motor > Trouble Codes Body Electrical > P-Door Motor > Trouble Codes

Result

Proceed to

Any Master Switch DTCs in the table below are output

A

Any D-Door Motor DTCs in the table below are output

B

Any P-Door Motor DTCs in the table below are output

C

No DTCs in the table below are output

D

Malfunction Status

System

Related DTCs

Power Window Switch Malfunction

Master Switch

B2312

ON Switch Failure

D-Door Motor

B2312

Master Switch of Driver side door Malfunction

P-Door Motor

B2312

Power Window Switch of Passenger side door Malfunction
A

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

C

GO TO STEP 5

D

END (DTC WAS STORED DUE TO SWITCH BEING OPERATED FOR 20 SECONDS OR MORE)
B

2.

READ VALUE USING GTS (D-DOOR MOTOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > D-Door Motor > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D Door P/W Up SW

Driver door power window manual up switch signal

OFF or ON

OFF: Driver door power window manual up switch not being operated

ON: Driver door power window manual up switch being operated

-

D Door P/W Down SW

Driver door power window manual down switch signal

OFF or ON

OFF: Driver door power window manual down switch not being operated

ON: Driver door power window manual down switch being operated

-
Body Electrical > D-Door Motor > Data List

Tester Display

D Door P/W Up SW

D Door P/W Down SW

OK:

On the GTS screen, ON or OFF is displayed accordingly.

OK

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

NG

3.

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Disconnect the power window regulator motor assembly (for driver door) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

L7-10 (UP) - Body ground

Ignition switch ON

11 to 14 V

L7-7 (DOWN) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to Power Window Regulator Motor Assembly (for Driver Door))
OK

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

NG

4.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door))

(a) Disconnect the L13 multiplex network master switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L13-20 (UP) or L7-10 (UP) - Body ground

Always

10 kΩ or higher

L13-15 (DOWN) or L7-7 (DOWN) - Body ground

Always

10 kΩ or higher
OK

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

READ VALUE USING GTS (P-DOOR MOTOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > P-Door Motor > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

P Door P/W Auto SW

Front passenger door power window auto switch signal

OFF or ON

OFF: Front passenger door power window auto up or auto down switch not being operated

ON: Front passenger door power window auto up or auto down switch being operated

-

P Door P/W Up SW

Front passenger door power window manual up switch signal

OFF or ON

OFF: Front passenger door power window manual up switch not being operated

ON: Front passenger door power window manual up switch being operated

-

P Door P/W Down SW

Front passenger door power window manual down switch signal

OFF or ON

OFF: Front passenger door power window manual down switch not being operated

ON: Front passenger door power window manual down switch being operated

-
Body Electrical > P-Door Motor > Data List

Tester Display

P Door P/W Auto SW

P Door P/W Up SW

P Door P/W Down SW

OK:

On the GTS screen, ON or OFF is displayed accordingly.

OK

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door)

NG

6.

INSPECT POWER WINDOW REGULATOR SWITCH ASSEMBLY

Click here

NG

REPLACE POWER WINDOW REGULATOR SWITCH ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR SWITCH ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door))

(a) Disconnect the K7 power window regulator motor assembly (for Front Passenger Door) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K13-5 (UP) or K7-10 (UP) - Body ground

Always

10 kΩ or higher

K13-8 (AUTO) or K7-4 (AUTO) - Body ground

Always

10 kΩ or higher

K13-4 (DOWN) or K7-7 (DOWN) - Body ground

Always

10 kΩ or higher
OK

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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