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Home >> Toyota >> 2002 >> Corolla LE, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Heated Glass/Defoggers >> Defogger System >> Inspection

Defogger System: Inspection

  1. Inspect defogger switch continuity  :

    Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 8, check that the indicator light up.

    Fig 1: Identifying & Testing Defogger Switch & Terminals
    G01908624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If operation is not as specified, replace the switch.

  2. Inspect defogger timer operation  :
    1. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 8.
      Fig 2: Testing Defogger Timer Operation
      G01908625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the positive (+) lead from the battery to terminal 2 through a 1.4 W test bulb.
    3. Push the defogger switch ON and check that the indicator light in switch 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. Inspect defogger switch circuit  :

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

    Fig 3: Identifying Defogger Switch Terminals
    G01908626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Defogger Switch Specifications
    G01908627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the circuit is as specified, replace the switch.

  4. Inspect defogger relay continuity  :
    Fig 5: Identifying Defogger Relay Terminals & Wiring Diagram
    G01908629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Defogger Relay Specifications
    G01908628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If continuity is not as specified, replace the relay.

  5. Inspect defogger wire  :
    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.
      Fig 7: Procedure For Probing Defogger Wire
      G01908632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 no voltage, the wire is broken between the center of the wire and ground.
      Fig 8: Identifying Defogger Wire Probing Points
      G01908630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 9: Defogger Wire Specifications Chart
      G01908631Courtesy 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.
      Fig 10: Locating Defogger Wire Break Point
      G01908633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. The point where the voltmeter deflects from zero to several V is the place where the heat wire is broken.
  1. 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 11: Preparing Defogger Wire For Repair Agent Application
      G01908634Courtesy 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 12: Applying Repair Agent
      G01908635Courtesy 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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