2008 Scion xB AutomaticFACTORY OEM SERVICE PROCEDURE

Terminals Of Ecu

  1. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLYΒ 
    Fig 1: Identifying Power Window Regulator Master Switch ECU Connector Terminals
    G05391243Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E4 power window regulator master switch assembly connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard:Β 

      TERMINALS VOLTAGE REFERENCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      E4-6 (B) - Body ground L - Body ground Ignition power supply Ignition switch OFF Below 1 V
      E4-6 (B) - Body ground L - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      E4-1 (E) - Body ground W-B - Body ground Ground Always Below 1 Ξ©

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the E4 power window regulator master switch assembly connector.
    4. Measure the voltage of the connector.

      Standard voltage:Β 

      TERMINALS VOLTAGE REFERENCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      E4-3 (U) - E4-1 (E) P - W-B Power window motor UP output (driver side) Ignition switch ON, driver side power window switch OFF β†’ UP (manual operation) Below 1 V β†’ 11 to 14 V
      E4-4 (D) - E4-1 (E) W - W-B Power window motor DOWN output (driver side) Ignition switch ON, driver side power window switch OFF β†’ DOWN (manual operation) Below 1 V β†’ 11 to 14 V
      E4-4 (D) - E4-1 (E) W - W-B Power window motor DOWN output (driver side) Ignition switch ON, driver side power window fully closed β†’ driver side power window switch DOWN (AUTO operation) β†’ driver side power window fully open Below 1 V β†’ 11 to 14 V β†’ Below 1 V
      E4-16 (U) - E4-1 (E) G - W-B Power window motor UP output (passenger side) Ignition switch ON, passenger side power window switch OFF β†’ UP Below 1 V β†’ 11 to 14 V
      E4-15 (D) - E4-1 (E) BR- W-B Power window motor DOWN output (passenger side) Ignition switch ON, passenger side power window switch OFF β†’ DOWN Below 1 V β†’ 11 to 14 V
      E4-12 (U) - E4-1 (E) R - W-B Power window motor UP output (rear LH) Ignition switch ON, rear LH side power window switch OFF β†’ UP Below 1 V β†’ 11 to 14 V
      E4-13 (D) - E4-1 (E) L - W-B Power window motor DOWN output (rear LH) Ignition switch ON, rear LH side power window switch OFF β†’ DOWN Below 1 V β†’ 11 to 14 V
      E4-10 (U) - E4-1 (E) G - W-B Power window motor UP output (rear RH) Ignition switch ON, rear RH side power window switch OFF β†’ UP Below 1 V β†’ 11 to 14 V
      E4-18 (D) - E4-1 (E) BR - W-B Power window motor DOWN output (rear RH) Ignition switch ON, rear RH side power window switch OFF β†’ DOWN Below 1V β†’ 11 to 14 V

      If the result is not as specified, the master switch may have a malfunction.

    5. Check the AUTO light illumination.
      1. After turning the ignition switch ON, check that the AUTO light illuminates (green).
  2. CHECK FRONT POWER WINDOW REGULATOR SWITCH ASSEMBLY RHΒ 
    Fig 2: Identifying Front Power Window Regulator Switch RH Connector Terminals
    G05391244Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D3 front power window regulator switch assembly RH connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage:Β 

      TERMINALS VOLTAGE REFERENCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      D3-3 (B) - Body ground L - Body ground Ignition power supply Ignition switch OFF Below 1 V
      D3-3 (B) - Body ground L - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      D31-1 (D) - Body ground B - Body ground Power window motor DOWN output Ignition switch ON, power window switch OFF β†’ DOWN Below 1 V β†’ 11 to 14 V
      D3-2 (SD) - Body ground BR - Body ground Power window motor DOWN input (Remote) Ignition switch ON, power window master switch OFF β†’ DOWN (Remote) Below 1 V β†’ 11 to 14 V
      D3-4 (U) - Body ground Y - Body ground Power window motor UP output Ignition switch ON, power window switch OFF β†’ UP Below 1 V β†’ 11 to 14 V
      D3-5 (SU) - Body ground G - Body ground Power window motor UP input (Remote) Ignition switch ON, power window master switch OFF β†’ UP (Remote) Below 1 V β†’ 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the D3 front power window regulator switch assembly RH connector.
  3. CHECK REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY LHΒ 
    Fig 3: Identifying Rear Power Window Regulator Switch LH Connector Terminals
    G05391245Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G1 rear power window regulator switch assembly LH connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage:Β 

      TERMINALS VOLTAGE REFERENCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      G1-3 (B) - Body ground P - Body ground Ignition power supply Ignition switch OFF Below 1 V
      G1-3 (B) - Body ground P - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      G1-4 (U) - Body ground G - Body ground Power window motor UP output Ignition switch ON, power window switch OFF β†’ UP Below 1 V β†’ 11 to 14 V
      G1-1 (D) - Body ground Y - Body ground Power window motor DOWN output Ignition switch ON, power window switch OFF β†’ DOWN Below 1 V β†’ 11 to 14 V
      G1-5 (SU) - Body ground R - Body ground Power window motor UP intput (Remote) Ignition switch ON, power window master switch OFF β†’ UP (Remote) Below 1 V β†’ 11 to 14 V
      G1-2 (SD) - Body ground L - Body ground Power window motor DOWN input (Remote) Ignition switch ON, power window master switch OFF β†’ DOWN (Remote) Below 1 V β†’ 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the G1 rear power window regulator switch assembly LH connector.
  4. CHECK REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY RHΒ 
    Fig 4: Identifying Rear Power Window Regulator Switch RH Connector Terminals
    G05391246Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the F1 rear power window regulator switch assembly RH connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage:Β 

      TERMINALS VOLTAGE REFERENCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      F1-3 (B) - Body ground L - Body ground Ignition power supply Ignition switch OFF Below 1 V
      F1-3 (B) - Body ground L - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      F1-4 (U) - Body ground R - Body ground Power window motor UP output Ignition switch ON, power window switch OFF β†’ UP Below 1 V β†’ 11 to 14 V
      F1-1 (D) - Body ground G - Body ground Power window motor DOWN output Ignition switch ON, power window switch OFF β†’ DOWN Below 1 V β†’ 11 to 14 V
      F1-5 (SU) - Body ground G - Body ground Power window motor UP input (Remote) Ignition switch ON, power window master switch OFF β†’ UP (Remote) Below 1 V β†’ 11 to 14 V
      F1-2 (SD) - Body ground BR - Body ground Power window motor DOWN input (Remote) Ignition switch ON, power window master switch OFF β†’ DOWN (Remote) Below 1 V β†’ 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the F1 rear power window regulator switch assembly RH connector.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
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  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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