2010 Scion xD AutomaticFACTORY OEM SERVICE PROCEDURE

Power Windows do not Operate at All: Procedure

  1. INSPECT FUSES (ECU-B, ECU-IG) 
    1. Remove the ECU-B fuse from the engine room relay block.
      Fig 1: Identifying ECU-B Fuse In Engine Room Relay Block
      GTY160316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the ECU-IG fuse from the main body ECU.
    3. Measure the resistance.

      Standard resistance

      Tester Connection Condition Specified Condition
      ECU-B fuse Always Below 1 Ω
      ECU-IG fuse Always Below 1 Ω
    4. Reinstall the fuses.

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. INSPECT MAIN BODY ECU (PWR RELAY) 
    1. Remove the POWER fuse from the main body ECU.
      Fig 2: Identifying POWER Fuse
      GTY160185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Measure the voltage between the POWER fuse terminal of the main body ECU and body ground.

      Standard voltage

      Tester Connection Condition Specified Conditions
      POWER fuse terminal (1) - Body ground Ignition switch ON 11 to 14 V
    4. Reinstall the POWER fuse.

    NG → REPLACE MAIN BODY ECU (PWR RELAY) 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (POWER WINDOW MASTER SWITCH - BATTERY AND BODY GROUND) 
    1. Disconnect the J1 power window regulator master switch assembly connector.
      Fig 3: Identifying J1 Power Window Regulator Master Switch Connector Terminals
      GTY162017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      J1-6 (B) - Body ground Ignition switch ON 11 to 14 V
    3. Measure the resistance of the wire harness side connector.

      Standard resistance

      Tester Connection Condition Specified Condition
      J1-1 (E) - Body ground Always Below 1 Ω
    4. Reconnect the J1 power window regulator master switch assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   4 

  4. REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY. Refer to  REMOVAL 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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