GSIC - Global Service Information Center

# WINDOW DEFOGGER SYSTEM > INSPECTION

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1. INSPECT REAR WINDOW DEFOGGER SWITCH ASSEMBLY

1. Check the illumination area of the switch.

   OK:

     Measurement Condition | Specified Condition
     Battery positive (+) 1 (ILL+) Battery negative (-) 2 (ILL-) | Illuminates

   If the result is not as specified, replace the switch assembly.

   HINT:
     The ON/OFF indicator of the switch will not illuminate.

1. Check the ON/OFF indicator of the switch.

   1. Push the switch several times. Check that the ON/OFF indicator illuminates or turns off according to switch operation.

      Ok:

        Measurement Condition | Switch Condition | Specified Condition
        Battery positive (+) 5 (IG) Battery negative (-) 3 (E) | Defogger switch ON | Illuminates

1. Measure the resistance of the switch.

   Resistance:

     Tester Connection | Switch Condition | Specified Condition
     4 (D) - 3 (E) | ON | Below 1 Ω
     4 (D) - 3 (E) | OFF | 10 k Ω or higher

   If the result is not as specified, replace the switch assembly.

2. INSPECT REAR WINDOW DEFOGGER WIRE

NOTICE:

1. When cleaning the glass, wipe the glass along the wire using a soft, dry cloth. Take care not to damage the wires.
2. Do not use detergents or glass cleaners that have abrasive ingredients.
3. 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.

1. Turn the ignition switch ON.

1. Turn the defogger switch ON.

1. Measure the voltage at the center of each defogger wire as shown in the illustration.

   Standard:

     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 end 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.

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

1. Place the voltmeter's negative (-) lead with the foil strip against the wire on the ground side.

1. Slide the positive (+) lead from the battery side to the ground side.

1. The point where the voltage jumps from approximately 10 V to 0 V is 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 and gradually increases to approximately 12 V as the meter probe moves to the other end.

1. If necessary, repair the defogger wire.

   1. Clean the broken wire tips with grease, wax and silicone remover.

   2. Place the masking tape along both sides of the wire.

   3. Thoroughly mix the repair agent (Dupont paste No. 4817 or equivalent).

   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.

      NOTICE:
        Do not repair the defogger wire again for at least 24 hours.

3. INSPECT RELAY (Marking: DEF)

1. Measure the resistance of the DEF relay.

   Standard:

     Tester Condition | Specified Condition
     3 - 5 | 10 kΩor higher
     3 - 5 | Below 1Ω (when battery voltage is applied to terminals 1 and 2)

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