Window Defogger System (For Double Swing Out Type) Rear Window Defogger System Does Not Operate

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEFOGGER RELAY)

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

CHECK REAR WINDOW DEFOGGER SYSTEM

INSPECT DEFOGGER RELAY (DEFOG)

CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - BATTERY AND AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - REAR WINDOW DEFOGGER AND BODY GROUND)

CHECK BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   
2. Since the window defogger system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.
   

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

   Air Conditioner

   Tester Display	Test part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Rear window defogger relay operation	OFF or ON	-

   OK:

   Rear window defogger relay operates normally.
   

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

1. Turn the ignition switch ON.
   

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

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

   OK:

   Rear window defogger system functioning.
   

1. Remove the defogger relay from the engine room relay block.
   

2. 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

1. Remove the defogger relay from the engine room relay block.
   

2. Disconnect the E81 air conditioning amplifier assembly connector.
   

3. 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

4. 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

1. Remove the defogger relay from the engine room relay block.
   

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

3. 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

NOTICE:

1. When cleaning the glass, wipe the glass along the wire using a soft, dry cloth. Take care not to damage the defogger 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 to ON.
   

2. Turn the defogger switch on.
   

3. 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

   Text in Illustration

   *a

   Center

   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.

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

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

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

7. 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.

   Text in Illustration

   *a	Ground Side
   *b	Foil Strip
   *c	Approximately 10 V
   *d	0 V
   *e	Broken Wire
   *f	Battery Side