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Window Defogger System: Inspection

  1. w/ Memory seat: 

    INSPECT OUTER REAR VIEW MIRROR ASSY LH 

    1. Apply battery voltage and check operation of the mirror heater.

    Standard: 

    MEASUREMENT SPECIFIED SPECIFICATION

    Measurement Condition Specified Condition
    Battery positive (+) --> Terminal (4) Mirror becomes warm
    Battery negative (-) --> Terminal (12)

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

    Fig 1: Identifying Outer Rear View Mirror Connector Terminal LH (With Memory Seat)
    G03479190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. w/ Memory seat: 

    INSPECT OUTER REAR VIEW MIRROR ASSY RH 

    1. Apply battery voltage and check operation of the mirror heater.

    Standard: 

    MEASUREMENT SPECIFIED SPECIFICATION

    Measurement Condition Specified Condition
    Battery positive (+) --> Terminal (4) Mirror becomes warm
    Battery negative (-) --> Terminal (12)

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

    Fig 2: Identifying Outer Rear View Mirror Connector Terminal RH (With Memory Seat)
    G03479191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. w/o Memory seat: 

    INSPECT OUTER REAR VIEW MIRROR ASSY LH 

    1. Apply battery voltage and check operation of the mirror heater.

    Standard: 

    MEASUREMENT SPECIFIED SPECIFICATION

    Measurement Condition Specified Condition
    Battery positive (+) --> Terminal (2) Mirror becomes warm
    Battery negative (-) --> Terminal (3)

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

    Fig 3: Identifying Outer Rear View Mirror Connector Terminal LH (W/O Memory Seat)
    G03479192Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. w/o Memory seat: 

    INSPECT OUTER REAR VIEW MIRROR ASSY RH 

    1. Apply battery voltage and check operation of the mirror heater.

    Standard: 

    MEASUREMENT SPECIFIED SPECIFICATION

    Measurement Condition Specified Condition
    Battery positive (+) --> Terminal (2) Mirror becomes warm
    Battery negative (-) --> Terminal (3)

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

    Fig 4: Identifying Outer Rear View Mirror Connector Terminal RH (W/ Out Memory Seat)
    G03479193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. w/ Deicer: 

    INSPECT FRONT WINDOW (DEICER WIRE) 

    1. Check the resistance of the deicer wire.

    Standard: 

    TESTER SPECIFIED SPECIFICATION

    Tester Connection Specified Condition
    1 -2 Below 1 Ω
    3-2

    If the result is not as specified, replace the front window.

    Fig 5: Identifying Front Window Deicer Terminal
    G03479194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. 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 including 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 6: Identifying Tester Probe, Tin Foil, And Defogger Wire
    G03479195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON.
    2. Turn the defogger switch ON.
    3. Check the voltage at the center of each defogger wire, as shown in the illustration.

      Standard: 

      VOLTAGE SPECIFIED CRITERIA

      Voltage Criteria
      Approx. 5 V Okay, wire is not broken
      Approx. 10 V or 0 V Wire is broken
      Fig 7: Checking Voltage At Center Of Each Defogger Wire
      G03479196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

    4. Place the voltmeter positive (+) lead against the defogger wire on the battery side.
    5. Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.
    6. Slide the positive (+) lead from the battery side to the ground side.
    7. The point where the voltmeter deflects from approx 10 V to 0 V is the place where the defogger wire is broken.

      HINT:

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

      Fig 8: Inspecting Voltage At Center Of Each Defogger Wire
      G03479197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 9: Identifying Repair Point
        G03479198Courtesy 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 10: Applying A Small Amount Of Agent To Wire
      G03479199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT HEATER MIRROR RELAY 
    1. Check the resistance.

    Standard: 

    TESTER CONNECTION SPECIFIED SPECIFICATION

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

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

    Fig 11: Identifying Heater Mirror Relay Terminals
    G03479200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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