DTC B2312: Power Window Switch Malfunction: Procedure

1. Check for LIN communication system DTCs related to the power window control system. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

   OK

   LIN communication system DTCs are not output.

NG → See step   9 

OK: Go to next step 

1. Check where DTC B2312 is output from.
   RESULT
   
   

   Result	Proceed to
   DTC B2312 output from power window regulator master switch assembly.	A
   DTC B2312 output from front power window regulator motor assembly LH.	B
   DTC B2312 output from front power window regulator motor assembly RH.	C

C → See step   6 

B → See step   4 

A: Go to next step 

1. Use the Data List to check if the master switch is functioning properly.
   MASTER SWITCH
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   D Door P/W Auto SW	Driver side power window auto UP/DOWN switch signal / ON or OFF	ON: Driver side switch of master switch operated OFF: Driver side switch of master switch not operated	-
   P Door P/W Auto SW	Front passenger side power window remote auto UP/DOWN switch signal / ON or OFF	ON: Front passenger side switch of master switch operated OFF: Front passenger side switch of master switch not operated	-
   P Door P/W Up SW	Front passenger side power window remote manual UP switch signal / ON or OFF	ON: Front passenger side switch of master switch operated OFF: Front passenger side switch of master switch not operated	-
   P Door P/W Down SW	Front passenger side power window remote manual DOWN switch signal / ON or OFF	ON: Front passenger side switch of master switch operated OFF: Front passenger side switch of master switch not operated	-
   Window Lock Switch Status	Power window LOCK switch / ON or OFF	ON: Power window lock switch in LOCK position OFF: Power window lock switch in UNLOCK position	-

   OK

   The Techstream display changes normally when master switch is operated.

NG → See step   10 

OK → END (DUE TO KEEPING SWITCH OPERATED FOR 20 SECONDS OR MORE) 

1. Use the Data List to check if the driver side motor is functioning properly.
   D-DOOR MOTOR
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   D Door P/W Auto SW	Driver side power window auto UP/DOWN switch signal / ON or OFF	ON: Driver side switch operated OFF: Driver side switch not operated	-
   D Door P/W Up SW	Driver side power window MANUAL UP switch signal / ON or OFF	ON: Driver side switch operated OFF: Driver side switch not operated	-
   D Door P/W Down SW	Driver side power window MANUAL DOWN switch signal / ON or OFF	ON: Driver side switch operated OFF: Driver side switch not operated	-

   OK

   The Techstream display changes normally when master switch is operated.

OK → END (DUE TO KEEPING SWITCH OPERATED FOR 20 SECONDS OR MORE) 

NG → Go to next step 

1. Disconnect the N2 master switch connector.
   Fig 1: Identifying Master Switch & Driver Side Motor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the N12 motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N2-4 (UP) - N12-10 (UP)	Always	Below 1 Ω
   N2-5 (DOWN) - N12-7 (DOWN)	Always	Below 1 Ω
   N2-4 (UP) - Body ground	Always	10 kΩ or higher
   N2-5 (DOWN) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11 

1. Use the Data List to check if the front passenger side motor is functioning properly.
   P-DOOR MOTOR
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   P Door P/W Auto SW	Front passenger side power window auto UP/DOWN switch signal / ON or OFF	ON: Power window regulator switch assembly operated OFF: Power window regulator switch assembly not operated	-
   P Door P/W Up SW	Front passenger side power window manual UP switch signal / ON or OFF	ON: Power window regulator switch assembly operated OFF: Power window regulator switch assembly not operated	-
   P Door P/W Down SW	Front passenger side power window manual DOWN switch signal / ON or OFF	ON: Power window regulator switch assembly operated OFF: Power window regulator switch assembly not operated	-

   OK

   The Techstream display changes normally when master switch is operated.

OK → END (DUE TO KEEPING SWITCH OPERATED FOR 20 SECONDS OR MORE) 

NG → Go to next step 

1. Remove the power window regulator switch assembly. Refer to REMOVAL .
   Fig 2: Identifying Power Window Regulator Switch Assembly & Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   6 (UP) - 1 (GND)	Manual UP operation	Below 1 Ω
   7 (DOWN) - 1 (GND)	Manual DOWN operation	Below 1 Ω
   8 (AUTO) - 1 (GND)	AUTO UP/DOWN operation	Below 1 Ω
   6 (UP) - 1 (GND)	Not operated	10 kΩ or higher
   7 (DOWN) - 1 (GND)	Not operated	10 kΩ or higher
   8 (AUTO) - 1 (GND)	Not operated	10 kΩ or higher

NG → See step   12 

OK: Go to next step 

1. Disconnect the M10 switch connector.
   Fig 3: Identifying Power Window Regulator Switch & Front Passenger Side Motor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the M11 motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M10-6 (UP) - M11-10 (UP)	Always	Below 1 Ω
   M10-7 (DOWN) - M11-7 (DOWN)	Always	Below 1 Ω
   M10-8 (AUTO) - M11-4 (AUTO)	Always	Below 1 Ω
   M10-6 (UP) - Body ground	Always	10 kΩ or higher
   M10-7 (DOWN) - Body ground	Always	10 kΩ or higher
   M10-8 (AUTO) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13