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Home >> Lexus >> 2005 >> SC 430 >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System - Diagnostics >> DTC B1221: Power Window Switch Circuit On Driver Door >> Inspection Procedure

Inspection Procedure

  1. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSY 
    1. Remove the master switch.
    2. Measure the resistance of the switch when the switch is operated.

      Standard: 

      Driver switch 

      POWER WINDOW REGULATOR MASTER SWITCH ASSY (DRIVER SWITCH)

      Switch Condition Tester Connection Specified Condition
      AUTO UP 6 (PW) - 16 (AUTO) Below 1 ohms
      AUTO UP 6 (PW) - 20 (DUP) Below 1 ohms
      UP 6 (PW) - 20 (DUP) Below 1 ohms
      OFF - -
      DOWN 6 (PW) - 11 (DDN) Below 1 ohms
      AUTO DOWN 6 (PW) - 11 (DDN) Below 1 ohms
      AUTO DOWN 6 (PW) - 16 (AUTO) Below 1 ohms

      Door control switch 

      POWER WINDOW REGULATOR MASTER SWITCH ASSY (DOOR CONTROL SWITCH)

      Switch Condition Tester Condition Specified Condition
      UNLOCK 10 (E) - 18 (MUL) Below 1 ohms
      LOCK 8 (ML) - 10 (E) Below 1 ohms
      OFF - -
      Fig 1: Identifying Power Window Regulator Master Switch Assy
      G02956618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY 
    2. OK: Go to next step. 
  2. CHECK WIRE HARNESS (POWER WINDOW REGULATOR MASTER SWITCH ASSY - MULTIPLEX NETWORK DOOR ECU FRONT LH) 
    1. Disconnect the P14 switch connector.
    2. Disconnect the D17 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      POWER WINDOW REGULATOR MASTER SWITCH ASSY - MULTIPLEX NETWORK DOOR ECU FRONT LH

      Tester Connection Specified Condition
      P14-6 (PW) - D17-21 (PWS) Below 1 ohms
      P14-10 (E) - D17-29 (PWE) Below 1 ohms
      P14-16 (AUTO) - D17-2 (AUTO) Below 1 ohms
      P14-20 (DUP) - D17-23 (MUP) Below 1 ohms
      P14-11 (DDN) - D17-25 (MDN) Below 1 ohms
      P14-8 (ML) - D17-8 (ML) Below 1 ohms
      P14-18 (MUL) - D17-19 (MUL) Below 1 ohms
      P14-6 (PW) or D17-21 (PWS) - Body ground 10 k ohms or higher
      P14-10 (E) or D17-29 (PWE) - Body ground 10 k ohms or higher
      P14-16 (AUTO) or D17-2 (AUTO) - Body ground 10 k ohms or higher
      P14-20 (DUP) or D17-23 (MUP) - Body ground 10 k ohms or higher
      P14-11 (DDN) or D17-25 (MDN) - Body ground 10 k ohms or higher
      P14-8 (ML) or D17-8 (ML) - Body ground 10 k ohms or higher
      P14-18 (MUL) or D17-19 (MUL) - Body ground 10 k ohms or higher
      Fig 2: Checking Wire Harness (Power Window Regulator Master Switch Assy - Multiplex Netowrk Door ECU Front LH)
      G02956619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH 
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