2007 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE

Window Defogger System: Inspection

  1. CHECK STEERING PAD SWITCH 
    1. Remove the horn button (See REMOVAL ).
    2. Disconnect the connector as shown in Fig 1.
      Fig 1: Disconnecting Connector
      G04476835Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the switch.

      Standard resistance 

      TERMINALS RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      3 (AC1) - 7 (EAC) OFF 29 to 31 kΩ
      3 (AC1) - 7 (EAC) ON 290 to 305 Ω

      If the result is not as specified, replace the switch.

      Fig 2: Identifying Steering Pad Switch Connectors
      G04476836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

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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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