LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Body & Frame >> Windows >> Windshield/WINDOWGLASS >> Power Window Control System >> DTC B1221 Power Window Switch Circuit on Driver Door >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 
    Fig 1: Identifying Power Window Regulator Master Switch Assembly Connector Terminals
    G05293423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the master switch.
    2. Measure the resistance of the switch when the switch is operated.

      Standard resistance: 

      for Driver switch 

      TESTER CONNECTION SPECIFIED CONDITION

      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
      8 (PW) - 16 (AUTO) AUTO DOWN Below 10 Ω
      6 (PW) - 11 (DDN) Below 50 Ω

      for Door control switch 

      TESTER CONNECTION SPECIFIED CONDITION

      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 

  2. CHECK WIRE HARNESS (MASTER SWITCH - DOOR ECU FRONT LH) 
    1. Disconnect the P14 switch connector.
    2. Disconnect the D17 ECU connector.
      Fig 2: Identifying P14 And D17 Connector Terminals
      G05293424Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      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