Window Defogger System: Inspection

INSPECT AIR CONDITIONING CONTROL ASSY
1. Inspect operation of the defogger switch indicator.
  
  Fig 1: Inspecting Air Conditioning Control Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Standard
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the air conditioning control assy.
2. Inspect the defogger switch continuity.
  
  Fig 3: Inspecting Defogger Switch Continuity
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Standard
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the air conditioning control assy.
INSPECT OUTER REAR VIEW MIRROR ASSY LH (W/OUTER MIRROR HEATER)
1. Inspect the mirror defogger operation.
  
  Fig 5: Inspecting Mirror Defogger Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Standard
  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 the mirror defogger operation.
  
  Fig 7: Inspecting Mirror Defogger Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 8: Standard
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the mirror assy.

INSPECT BACK WINDOW (DEFOGGER WIRE)

NOTE:

When cleaning the glass, using a soft and dry cloth wipe the glass along of the wire. 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 the illustration.

Fig 9: Inspecting Back Window (Defogger 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 heat wire as shown in the illustration.

Fig 10: Inspecting Voltage At Center Of Each Heat Wire

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD

Voltage	Criteria
Approx. 5 V	Okay wire is not broken
Approx. 10 V or 0 V	Wire is not broken

HINT:

If there is approximately 10 V, the wire may be broken between the center of the wire and the positive (+) end. If there is no voltage, the wire may be broken between the center of the wire and ground.

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

Fig 11: Placing Voltmeter Positive (+) Lead Against Defogger Wire On Battery Side

Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.
Slide the positive (+) lead from battery to ground side.
The point where the voltmeter deflects from several 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.

Fig 12: Repairing Defogger Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Clean the broken wire tips with grease, wax and silicone remove.
2. Place the masking tape along the both sides of the wire.
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.
5. After a few minutes, remove the masking tape.
NOTE: Do not repair the defogger wire for at least 24 hours.

INSPECT DEFOGGER RELAY (Marking: DEF)
1. Inspect the continuity.
Fig 14: Inspecting Defogger Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 15: Standard
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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