On-Vehicle Inspection

CHECK REAR WINDOW DEFOGGER SYSTEM
1. When the engine switch is turned on (IG) and the defogger switch is pressed, check that the rear window defogger operates
  HINT:
  
  After 15 minutes, check that the defogger automatically turns OFF

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 that have abrasive ingredients.

Fig 1: Pressing Foil Against Wire With Your Finger
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
When measuring voltage, wrap a piece of tin foil around the tip of the negative tester probe and press the foil against the wire with your finger, as shown in the illustration.

Turn the engine switch on (IG)
Turn the defogger switch ON.

Fig 2: Measuring Defogger Wire Voltage
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

STANDARD VOLTAGE

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

HINT.

If there is approximately 10 V, the wire may be faulty between the center of the wire and the wire and on the battery side If there is no voltage, the wire may be faulty between the center of the wire and the wire end on the ground side

Place the voltmeter's positive (+) lead against the defogger wire on the battery side
Place the voltmeter's negative (-) lead with the foil strip against the wire on the ground side.

Fig 3: Checking Voltage At Center Of Each Defogger Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Slide the positive (+) lead from the battery side to the ground side.
The point where the voltage drops from approximately 10 V to 0 V is the place where the defogger wire is broken.
HINT.

If the defogger wire is not broken, the voltmeter should indicate 0 V at the positive (+) end of the defogger wire but gradually increases to approximately 12 V as the meter probe moves to the other end.