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Defogger System: Inspection

WARNING: This page is about a different car, the 2002 Toyota ECHO. However, it is still accessible from the selected car via links, so may be relevant.
  1. W/O Defogger timer, 

    Inspect defogger switch continuity  :

    Fig 1: Identifying Defogger Switch & Terminals
    G01894823Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Defogger Switch Specifications Chart
    G01894822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If continuity is not as specified, replace the switch.

  2. W/Defogger timer, 

    inspect defogger timer opeation  :

    1. Connect the positive (+) lead from the battery to terminal 3 and negative (-) lead to terminal 4.
      Fig 3: Testing Defogger Timer Opeation
      G01894824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the positive (+) lead from the battery to terminal 2 through a 3.4 W test bulb.
    3. Turn the defogger switch ON and check that the indicator light and test bulb light up for 12 for 18 minutes, then the indicator light and test bulb lights go out.

      If operation is not as specified, replace the switch.

  3. W/Defogger timer, 

    inspect defogger switch corcuit  :

    Disconnect the connector from the switch and inspect the connector on wire harness side, as shown in the chart.

    Fig 4: Identifying Defogger Switch Terminals (Wire Harness Side)
    G01894825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Defogger Switch Terminal Specifications
    G01894826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  4. Inspect defogger realy continuity  :
    Fig 6: Identifying Defogger Relay Terminals
    G01894828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: Defogger Relay Specifications Chart
    G01894827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If Continuity is not as specified, replace the relay.

    5. NOTE:
    • When cleaning the glass, use a soft, dry cloth, and wipe the glass in the direction of the wire. Take care not to damage the wires.
    • Do not use detergents or glass cleaners with abrasive ingredients.
    • When measuring voltage, wind a piece of tin foil around the top of the negative probe and press the foil against the wire with your finger, and shown.
      Fig 8: Procedure For Probing Defogger Wire
      G01894829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 11: Explaining Causes Of Possible Voltage Readings
    G01894832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Insperct defogger wire  :
    1. Turn the ignition switch ON.
    2. Turn the defogger switch ON.
      3. NOTE: If there is approximately 10 V, the wire is broken between the center of the wire and the positive (+) end. If there is not voltage, the wire is broken between the center of the wire and ground.
      Fig 9: Identifying Defogger Wire Probing Points
      G01894831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 10: Defogger Wire Specifications Chart
      G01894830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Inspect the voltage at the center of each heat wire.
    4. Place the voltmeter positive (+) lead against the defogger positive (+) terminal.
    5. Place the voltmeter negative (-) lead with the foil strip against the heat wire at the positive (+) terminal end and slide it toward the negative (-) terminal end.
      6. NOTE: If the heat wire is not broken, the voltmeter indicates 0 V at the positive (+) end of the heat wire but gradually increases to about 12 V as the meter probe is moved to the other end.
    6. The point where the voltmeter deflects from zero to several V is the place where the heat wire is broken.
  6. If necessary, repair 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 for repair.
      Fig 12: Repairing Defogger Wire
      G01894833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Thoroughly mix the repair agent (Dupont paste No. 4817).
    4. Using a fine tip brush, apply a small amount of the agent to the wire.
      Fig 13: Applying Repair Agent
      G01894834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. After a few minutes, remove the masking tape.
    6. Do not repair the defogger wire for at least 24 hours.
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