WINDOW DEFOGGER SYSTEM (for Double Swing Out Type) - Rear Window Defogger System does not Operate

Select the Active Test using the intelligent tester to generate a control command, and then check that the rear window defogger operates.

• OK:
• Rear window defogger relay operates normally.

Temporarily replace the air conditioning control assembly with a new or normally function one ().

Turn the ignition switch ON.

Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.

Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.

• OK:
• Rear window defogger system functioning.

Remove the defogger relay from the engine room relay block.

Measure the resistance according to the value(s) in the table below.

• Standard Resistance:

• Tester Connection	Condition	Specified Condition
  3 - 4	Battery voltage is not applied to terminals 1 and 2	Below 1 Ω
  3 - 5		10 kΩ or higher
  3 - 4	Battery voltage is applied to terminals 1 and 2	10 kΩ or higher
  3 - 5		Below 1 Ω

Remove the defogger relay from the engine room relay block.

Disconnect the E81 air conditioning amplifier assembly connector.

Measure the voltage according to the value(s) in the table below.

• Standard Voltage:

• Tester Connection	Condition	Specified Condition
  Defogger relay terminal 1 - Body ground	Ignition switch ON	11 to 14 V
  Defogger relay terminal 5 - Body ground	Always	11 to 14 V

Measure the resistance according to the value(s) in the table below.

• Standard Resistance:

• Tester Connection	Condition	Specified Condition
  Defogger relay terminal 2 - E81-38 (RDEF)	Always	Below 1 Ω

Remove the defogger relay from the engine room relay block.

Disconnect the W4, W5, T3 and T4 defogger wire connectors.

Measure the resistance according to the value(s) in the table below.

• Standard Voltage:

• Tester Connection	Condition	Specified Condition
  Defogger relay terminal 3 - W4-1 (B)	Always	Below 1 Ω
  W5-1 (E) - Body ground
  Defogger relay terminal 3 - T3-1 (B)
  T4-1 (E) - Body ground
  Defogger relay terminal 4 - Body ground
  W4-1 (B) - Body ground	Always	10 kΩ or higher
  T3-1 (B) - Body ground

Turn the ignition switch to ON.

Turn the defogger switch on.

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

• Standard Voltage:

• Voltage	Diagnosis
  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 ground side. If there is no voltage, the wire may be faulty between the center of the wire and the wire end on the battery 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 voltage drops 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 10 V at the positive (+) end of the defogger wire and gradually decreases to approximately 0 V as the meter probe moves to the other end.