Defogger System: Inspection

INSPECT HAZARD WARNING SIGNAL SWITCH ASSY

Check the defogger switch illuminates.

Standard:

INSPECT HAZARD WARNING

Measurement Condition	Specified Condition
Battery positive (+) --> ILL+ (6) Battery negative (-) --> ILL- (5)	Illuminates

Fig 1: Inspecting Hazard Warning Signal Switch Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the result is not as specified, replace the switch assy or bulb.

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 2: Checking Defogger Timer
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT OUTER REAR VIEW MIRROR ASSY LH (w/OUTER MIRROR HEATER)

Inspect operation of the mirror heater.

Standard:

INSPECT OPERATION MIRROR HEATER

Measurement Condition	Specified Condition
Battery positive (+) --> H+ (1) Battery negative (-) --> H- (5)	Mirror becomes warm

Fig 3: Inspecting Outer Rear View Mirror Assy LH (W/Outer Mirror Heater)

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)

Inspect operation of the mirror heater.

Standard:

INSPECT OUTER REAR VIEW MIRROR ASSY

Measurement Condition	Specified Condition
Battery positive (+) --> H+ (1) Battery negative (-) --> H- (5)	Mirror becomes warm

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

Fig 4: Inspecting Outer Rear View Mirror Assy RH (W/Outer Mirror Heater)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard:

Inspect the resistance of the deicer wire.

INSPECT FRONT WINDOW (DEICER WIRE

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

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

Fig 5: Inspecting Front Window (Deicer Wire) (W/Deicer)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 the illustration

Fig 6: Inspecting Back Window (Defogger Wire)

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

Inspect the voltage at the center of each defogger wire, as shown in the illustration.

Standard:

Voltage-Criteria

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

Fig 7: Inspecting Voltage At Center Of Defogger Wire

NOTE: 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.
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.

Fig 8: Placing Voltmeter Positive (+) Lead Against Defogger Wire On Battery Side
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: 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.
3. Thoroughly mix the repair agent (DuPont paste No. 4817).
  
  Fig 9: Placing Masking Tape Along Both Sides Of Wire
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 again for at least 24 hours.

Fig 10: Applying Small Amount Of Agent To Wire

INSPECT FR WIPER DEICER RELAY (W/DEICER)
1. (a) Inspect the resistance.
  Standard:
  
  Fig 11: Inspecting FR Wiper Deicer Relay (W/Deicer)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 12: Terminal Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If the result is not as specified, replace the relay.
INSPECT DEFOGGER RELAY
1. Inspect the resistance.
  Standard:
  
  Fig 13: Inspecting Defogger Relay
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 14: Defogger Relay Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If the result is not as specified, replace the relay.