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Window Defogger System: Inspection

  1. INSPECT STEERING WHEEL PAD SWITCH 
    1. Remove the steering wheel pad (see OVERHAUL ).
    2. Disconnect the connector, as shown in the illustration.
      Fig 1: Disconnecting Connector
      G03629711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the switch resistance.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      3 - 7 OFF 29 -31 kΩ
      3 - 7 ON 290 - 305 Ω

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

    Fig 2: Measuring Switch Resistance
    G03629712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT OUTER REAR VIEW MIRROR ASSY LH 
    1. Apply battery voltage and check operation of the mirror heater.

      OK: 

      MEASUREMENT CONDITION AND SPECIFIED CONDITION CHART

      Measurement Condition Specified Condition
      Battery positive (+) --> Terminal 2 (M+)
      Battery negative (-) --> Terminal 1 (M-)      		 Mirror becomes warm

    If the result is not as specified, replace the mirror assy.

    Fig 3: Identifying Outer Rear View Mirror Assy LH
    G03629713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT OUTER REAR VIEW MIRROR ASSY RH 
    1. Apply battery voltage and check operation of the mirror heater.

      OK: 

      MEASUREMENT CONDITION AND SPECIFIED CONDITION CHART

      Measurement Condition Specified Condition
      Battery positive (+) --> Terminal 2 (M+)
      Battery negative (-) --> Terminal 1 (M-)      		 Mirror becomes warm

    If the result is not as specified, replace the mirror assy.

    Fig 4: Identifying Outer Rear View Mirror Assy RH
    G03629714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT BACK WINDOW (DEFOGGER WIRE) 
    NOTE:
    • When cleaning the glass, wipe the glass along the wire using a soft and dry cloth. Take care not to damage the wires.
    • Do not use detergents or glass cleaners that have abrasive ingredients.
    • When measuring voltage, wrap a piece of tin foil around the tip of the negative tester probe and press the foil against the wire with your finger, as shown in the illustration.
    Fig 5: Identifying Tester Probe
    G03629715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Change the power switch ON (ACC) by pushing the power switch.
    2. Push the defogger switch ON.
    3. Check the voltage at the center of each defogger wire, as shown in the illustration.

      Standard: 

      VOLTAGE AND CRITERIA CHART

      Voltage Criteria
      Approx. 5 V Wire is not broken
      Approx. 10 or 0 V Wire is broken
      Fig 6: Checking Voltage At Center Of Each Defogger Wire
      G03629716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If there is approximately 10 V, the wire may be faulty between the center of the wire and the wire end on the battery side. If there is no voltage, the wire may be faulty between the center of the wire and the wire end on the ground side.

    4. Place the voltmeter's positive (+) lead against the defogger wire on the battery side.
    5. Place the voltmeter's negative (-) lead with the foil strip against the wire on the ground side.
      Fig 7: Checking Voltage
      G03629717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Slide the positive (+) lead from the battery side to the ground side.
    7. The point where the voltage jumps from approximately 10 V to 0 V is where the defogger wire is broken.

      HINT:

      If the defogger wire is not broken, the voltmeter should indicate 0 V at the positive (+) end of the defogger wire and gradually increases to approximately 12 V as the meter probe moves to the other end.

    8. If necessary, repair the defogger wire.
      1. Clean the broken wire tips with grease, wax and silicone remover.
      2. Place the masking tape along both sides of the wire.
      3. Thoroughly mix the repair agent (Dupont paste No. 4817).
        Fig 8: Placing Masking Tape Along Both Sides Of Wire
        G03629718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Using a fine tip brush, apply a small amount of the agent to the wire.
      5. After a few minutes, remove the masking tape.
    NOTE: Do not repair the defogger wire again for at least 24 hours.
    Fig 9: Applying A Small Amount Of Agent To Wire
    G03629719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT MIRROR HEATER RELAY 
    1. Remove the mirror heater relay.
    2. Measure the resistance.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage is applied to terminals 1 and 2)

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

    Fig 10: Identifying Mirror Heater Relay
    G03629720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT DEF RELAY 
    1. Remove the instrument panel sub-assy lower (see INSTRUMENT PANEL SUB-ASSY ).
    2. Measure the voltage.

      Standard: 

      TERMINAL CONNECTION AND SPECIFIED CONDITION CHART

      Terminal Connection Power Switch Condition Specified Condition
      IJ-2 - Body ground OFF to ON (ACC) 0 to 12-14 V

    If the result is not as specified, replace the instrument panel J/B assy.

    Fig 11: Identifying DEF Relay
    G03629721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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