LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2003 >> Sienna CE >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Heated Glass/Defoggers >> Defogger System >> Inspection

Defogger System: Inspection

  1. Manual Air Conditioning: INSPECT DEFOGGER SWITCH CONTINUITY 
    Fig 1: Inspecting Defogger Switch Continuity
    G02840384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    If operation is not as specified, replace the switch.

  2. Manual Air Conditioning: INSPECT DEFOGGER TIMER OPERATION 
    Fig 2: Inspecting Defogger Timer Operation
    G02840385Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 8.
    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. Manual Air Conditioning: 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 (Manual A/C)
    G02840386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER SPECIFIED CONDITION

    Tester Connection Condition Specification
    8 - Ground Constant Continuity
    1 - Ground Ignition Switch LOCK Or ACC No Voltage
    1 - Ground Ignition Switch ON Battery Voltage
    2 - Ground Ignition Switch LOCK Or ACC No Voltage
    2 - Ground Ignition Switch ON Battery Voltage
      Connect Terminals 2 & 8 Defogger System Operation Normal.

    If the circuit is as specified, replace the switch.

  4. Automatic Air Conditioning: INSPECT DEFOGGER SWITCH CIRCUIT 
    Fig 4: Identifying Defogger Switch Terminals (Automatic A/C)
    G02840387Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    TESTER SPECIFIED CONDITION

    Tester Connection Condition Specification
    1 - Ground Constant Continuity
    10 - Ground Ignition Switch LOCK Or ACC No Voltage
    10 - Ground Ignition Switch ON Battery Voltage

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

  5. INSPECT DEFOGGER RELAY CONTINUITY 

    If continuity is not as specified, replace the relay.

    Fig 5: Identifying Defogger Relay Terminals
    G02840389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Defogger Relay Specifications
    G02840388Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. w/ Mirror Heater: INSPECT MIRROR DEFOGGER CIRCUIT 
    Fig 7: Inspecting Mirror Defogger Circuit
    G02840390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 6.
    2. Check that the mirror becomes warm.
      NOTE: It takes short time for the mirror to become warm.
  7. 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, as shown.
      Fig 8: Inspecting Defogger Wire
      G02840391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON.
    2. Turn the defogger switch ON.
    3. Inspect the voltage at the center of each heat wire, as shown.
      Fig 9: Inspecting Voltage At Center Of Each Heat Wire (1 Of 2)
      G02840392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      VOLTAGE SPECIFICATION

      Voltage Criteria
      Approx. 5V Okay (No Break In Wire)
      Approx. 10V or 0V Broken Wire
      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.
    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. The point where the voltmeter deflects from zero to several V is the place where the heat wire is broken.
      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: Inspecting Voltage At Center Of Each Heat Wire (2 Of 2)
      G02840393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. IF NECESSARY, REPAIR DEFOGGER WIRE 
    Fig 11: Repairing Defogger Wire
    G02840394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Clean the broken wire tips with grease, wax and silicone remover.
    2. Place the masking tape along both sides of the wire to be repaired.
    3. Thoroughly mix the repair agent (DuPont paste No. 4817).
    4. Thoroughly mix the repair agent (DuPont paste No. 4817 or equivalent).
    5. Using a fine tip brush, apply a small amount to the wire.
      6. Fig 12: Applying Small Amount Of Repair Agent To Wire
      G02840395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. After a few minutes, remove the masking tape.
    7. Do not repair the defogger wire for at least 24 hours.
scientia non olet · About LEMON Manuals