Window Defogger System: Inspection

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HAZARD WARNING SIGNAL SWITCH ASSY
1. Check the defogger switch illuminates.
  
  Fig 1: Checking Defogger Switch Illuminates
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Hazard Warning Signal Switch Assy Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the switch assy or bulb.
2. Check the defogger timer.
  1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 3.
  2. Connect the positive (+) lead from the battery to terminal 1 through a 1.4 W test bulb.
  3. Push the outer defogger switch ON then check that the switch and the test bulb turn off after they illuminate for 12 to 18 minutes.
  If the result is not as specified, replace the switch assy.
  
  Fig 3: Checking Defogger Timer
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OUTER REAR VIEW MIRROR ASSY LH (w/ OUTER MIRROR HEATER)
1. Inspect operation of the mirror heater.
  
  Fig 4: Inspecting Mirror Heater Operation (LH)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 5: Outer Rear View Mirror Assy LH (W/Outer Mirror Heater) Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the mirror assy.
INSPECT OUTER REAR VIEW MIRROR ASSY RH (w/ OUTER MIRROR HEATER)
1. Inspect operation of the mirror heater.
  
  Fig 6: Inspecting Mirror Heater Operation (RH)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard:

Fig 7: Outer Rear View Mirror Assy RH (W/Outer Mirror Heater) Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

INSPECT FRONT WINDOW (DEICER WIRE) (W/ DEICER)

Standard:

Inspect the resistance of the deicer wire.

FRONT WINDOW (DEICER WIRE) (W/ DEICER)

Terminal No.	Condition	Specified Condition
1-2	Constant	Below 1 Ω

Fig 8: Inspecting Front Window (Deicer Wire) (With Deicer)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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 probe and press the foil against the wire with your finger as shown in Fig 9.

Fig 9: Pressing Foil Against Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Turn the ignition switch ON.
Turn the defogger switch ON.

Inspect the voltage at the center of each defogger wire as shown in Fig 10.

Fig 10: Inspecting Voltage At Center Of Each Defogger Wire

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

BACK WINDOW (DEFOGGER WIRE)

Voltage	Criteria
Approx. 5 V	Okay, wire is not broken
Approx. 10 V or O V	Wire is broken

HINT:

If there is approximately 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.

Place the voltmeter positive (+) lead against the defogger wire on the battery side.

Fig 11: Placing Voltmeter Lead Against Defogger Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.
Slide the positive (+) lead from the battery side to the ground side.
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 about 12 V as the meter probe moves to the other end.
If necessary, repair the defogger wire.
1. Clean the broken wire tips with grease, wax and silicone remover.
2. Place the masking tape along the both sides of the wire.
  
  Fig 12: Placing Masking Tape Along Both Sides Of Wire
  Courtesy 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 Small Amount Of Agent To Wire Using Fine Tip Brush
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. After a few minutes, remove the masking tape.
NOTE: Do not repair the defogger wire again for at least 24 hours.

INSPECT FR WIPER DEICER RELAY (W/ DEICER)

Inspect the resistance.

Fig 14: Inspecting FR Wiper Deicer Relay (W/Deicer)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

FR WIPER DEICER RELAY (W/ DEICER)

Terminal No.	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.

INSPECT DEFOGGER RELAY

Standard:

DEFOGGER RELAY

Terminal No.	Specified Condition
3-4	Below 1 Ω
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.