FixVault
Home › Lexus › 2005 › LS 430 › Repair and Diagnosis › Body & Frame › Windows › Power Window Control System - Diagnostics › DTC B1226: Power Window Switch Circuit On Rear Left Door › Inspection Procedure

Inspection Procedure

  1. INSPECT POWER WINDOW REGULATOR SWITCH ASSY (REAR LH) 
    1. Remove the switch.
    2. Measure the resistance of the switch when the switch is operated.

    Standard 

    POWER WINDOW REGULATOR SWITCH ASSY (REAR LH) RESISTANCE SPECIFICATIONS

    Switch Condition Tester Connection Specified Condition
    AUTO UP 3 (A) - 8 (PCT) 1 (U) - 8 (PCT) Below 1 Ω
    UP 1 (U) - 8 (PCT) Below 1 Ω
    OFF - -
    DOWN 6 (D) - 8 (PCT) Below 1 Ω
    AUTO DOWN 3 (A) - 8 (PCT) 6 (D) - 8 (PCT) Below 1 Ω

    NG: REPLACE POWER WINDOW REGULATOR SWITCH ASSY (REAR LH) 

    Fig 1: Identifying Power Window Regulator Switch Assy (Rear LH) Connector Terminals
    G03000752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK WIRE HARNESS (POWER WINDOW REGULATOR SWITCH ASSY (REAR LH) - REAR DOOR LH ECU) 
    1. Disconnect the P11 switch connector.
    2. Disconnect the R12 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

    Standard 

    RESISTANCE SPECIFICATIONS

    Tester Connection Specified Condition
    P11-1 (U) - R12-29 (MUP) Below 1 Ω
    P11-3 (A) - R12-10 (AUTO) Below 1 Ω
    P11-4 (E) - R12-19 (PWE) Below 1 Ω
    P11-6 (D) - R12-21 (MDN) Below 1 Ω
    P11-8 (PCT) - R12-11 (PCTO) Below 1 Ω
    P11-1 (U) or R12-29 (MUP) - Body ground 10 kΩ or higher
    P11-3 (A) or R12-10 (AUTO) - Body ground 10 kΩ or higher
    P11-4 (E) or R12-19 (PWE) - Body ground 10 kΩ or higher
    P11-6 (D) or R12-21 (MDN) - Body ground 10 kΩ or higher
    P11-8 (PCT) or R12-11 (PCTO) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 2: Identifying P11 Switch And R12 ECU Connector Terminals
    G03000753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE REAR DOOR LH ECU 

About FixVault