DTC B1221: Power Window Switch Circuit on Driver Door: Procedure

1. Remove the master switch.
   Fig 1: Identifying Power Window Regulator Master Switch Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the switch when the switch is operated.

   Standard resistance

   for Driver switch 

   for Door control switch 

   Tester Connection	Switch Condition	Specified Condition
   6 (PW) - 16 (AUTO) 6 (PW) - 20 (DUP)	AUTO UP	Below 50 Ω
   6 (PW) - 20 (DUP)	UP	Below 50 Ω
   -	OFF	-
   6 (PW) - 11 (DDN)	DOWN	Below 10 Ω
   6 (PW) - 16 (AUTO)	AUTO DOWN	Below 10 Ω
   6 (PW) - 11 (DDN)		Below 50 Ω

   Switch Condition	Tester Connection	Specified Condition
   UNLOCK	10 (E) - 18 (MUL)	Below 1 Ω
   LOCK	8 (ML) - 10 (E)	Below 1 Ω
   OFF	-	-

NG → REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 

OK: Go to next step 

Fig 2: Identifying P14 And D17 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the P14 switch connector.
2. Disconnect the D17 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   P14-6 (PW) - D17-21 (PWS)	Below 1 Ω
   P14-10 (E) - D17-29 (PWE)	Below 1 Ω
   P14-16 (AUTO) - D17-2 (AUTO)	Below 1 Ω
   P14-20 (DUP) - D17-23 (MUP)	Below 1 Ω
   P14-11 (DDN) - D17-25 (MDN)	Below 1 Ω
   P14-8 (ML) - D17-8 (ML)	Below 1 Ω
   P14-18 (MUL) - D17-19 (MUL)	Below 1 Ω
   P14-6 (PW) or D17-21 (PWS) - Body ground	10 kΩ or higher
   P14-10 (E) or D17-29 (PWE) - Body ground	10 kΩ or higher
   P14-16 (AUTO) or D17-2 (AUTO) - Body ground	10 kΩ or higher
   P14-20 (DUP) or D17-23 (MUP) - Body ground	10 kΩ or higher
   P14-11 (DDN) or D17-25 (MDN) - Body ground	10 kΩ or higher
   P14-8 (ML) or D17-8 (ML) - Body ground	10 kΩ or higher
   P14-18 (MUL) or D17-19 (MUL) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK → REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH