WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line*1 or CAN communication line and UART communication line*2 to the air conditioning amplifier assembly. Then the air conditioning amplifier assembly operates the rear window defogger. When the on signal from the switch is received, the defogger relay (DEFOG) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the defogger relay (DEFOG) operation is stopped.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK FOR DTC

   
   

   • *1: w/o Navigation System

   • *2: w/ Navigation System

   
   

   1. Check if the LIN communication system*1 or CAN communication system*2 is functioning normally.

      
      

      • LIN communication system: (Click here)

      • CAN communication system (for LHD): (Click here)

      • CAN communication system (for RHD): (Click here)

      Table 1. Result

      Result	Proceed to
      DTC is not output	A
      LIN DTC is output*1	B
      CAN DTC is output (for LHD)*2	C
      CAN DTC is output (for RHD)*2	D

   
   
   • AClick here
   • BClick here
   • CClick here
   • DClick here
2. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEFOGGER RELAY)

   
   

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

      Table 2. Air Conditioner

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

      OK
      On intelligent tester screen, item changes between ON and OFF according to above chart.

      Table 3. Result

      Result	Proceed to
      OK (w/o Navigation System)	A
      OK (w/ Navigation System)	B
      NG	C

   
   
   • AClick here
   • BClick here
   • CClick here
3. Click here

   REPLACE AIR CONDITIONING CONTROL ASSEMBLY

   
   

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

   
   
   • NEXTClick here
4. Click here

   CHECK WINDOW DEFOGGER SYSTEM

   
   

   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 normally.

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK NAVIGATION SYSTEM

   
   

   1. Check if the navigation system function properly (Click here).

      OK
      Navigation system function properly.

   
   
   • OKClick here
   • NGClick here
6. Click here

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

   
   

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

   
   
   • NEXTClick here
7. Click here

   CHECK WINDOW DEFOGGER SYSTEM

   
   

   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 normally.

   
   
   • OKClick here
   • NGClick here
8. Click here

   REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY

   
   

   1. Temporarily replace the multi-media module receiver assembly with a new or normally functioning one (Click here).

   
   
   • NEXTClick here
9. Click here

   CHECK WINDOW DEFOGGER SYSTEM

   
   

   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 normally.

   
   
   • OKClick here
   • NGClick here
10. Click here

    INSPECT DEFOGGER RELAY (DEFOG)

    
    
    1. 

       Remove the defogger relay from the engine room junction 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

       Table 4. Result

       Result	Proceed to
       OK (w/ Rear Heater)	A
       OK (w/o Rear Heater)	B
       NG	C

    
    
    • AClick here
    • BClick here
    • CClick here
11. Click here

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

    
    
    1. 

       Remove the defogger relay from the engine room relay block.

    2. Disconnect the E36 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 - E36-24 (RDEF) Always Below 1 Ω

    
    
    • OKClick here
    • NGClick here
12. Click here

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

    
    
    1. 

       Disconnect the S20 and S21 defogger wire connectors.

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

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

       Standard Resistance
       Tester Connection Condition Specified Condition S20-1(B) - Defogger relay terminal 3 Always Below 1 Ω S21-1(B) - Body ground Defogger relay terminal 4 - Body ground S20-1(B) - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
13. Click here

    CHECK REAR WINDOW DEFOGGER WIRE

    
    
    1. 

       Disconnect the S20 and S21 defogger wire connectors.

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition S20-1 (B) - S21-1 (E) Ignition switch ON and defogger switch on 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
14. Click here

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

    
    
    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

    
    
    • OKClick here
    • NGClick here
15. Click here

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

    
    
    1. 

       Disconnect the S20 and S21 defogger wire connectors.

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

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

       Standard Resistance
       Tester Connection Condition Specified Condition S20-1(B) - Defogger relay terminal 3 Always Below 1 Ω S21-1(B) - Body ground Defogger relay terminal 4 - Body ground S20-1(B) - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
16. Click here

    CHECK REAR WINDOW DEFOGGER WIRE

    
    
    1. 

       Disconnect the S20 and S21 defogger wire connectors.

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

       Standard Voltage
       Tester Connection Switch Condition Specified Condition S20-1 (B) - S21-1 (E) Ignition switch ON and defogger switch on 11 to 14 V

    
    
    • OKClick here
    • NGClick here
17. Click here

    REPLACE DEFOGGER RELAY

18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

19. Click here

    REPLACE BACK WINDOW GLASSClick here

20. Click here

    END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

21. Click here

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

22. Click here

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

23. Click here

    GO TO LIN COMMUNICATION SYSTEMClick here

24. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

25. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

26. Click here

    GO TO NAVIGATION SYSTEMClick here

27. Click here

    END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY IS DEFECTIVE)

28. Click here

    REPLACE MULTI-DISPLAYClick here