WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

• for Manual Air Conditioning System:




• When the rear window defogger switch, which is built into the heater control, is operated, operation signals are transmitted to the DEF relay coil . When the DEF relay coil receives the signals, the DEF relay switch turns on to operate the rear window defogger.

• for Automatic Air Conditioning System:




• When the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates the rear window defogger. When the on signal from the switch is received, the DEF relay is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the DEF relay operation is stopped.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (Battery Voltage Lo Record)

   
   

   1. Using the intelligent tester, inspect battery voltage reduction history "Battery Voltage Lo Record" in the Data List.

      EMPS

      Tester Display	Measurement item/Range	Normal Condition	Diagnostic Note
      Battery Voltage Lo Record	Battery voltage reduction history/ Min.: 0 times, Max.: 65535 times	0 to 65535	-

      Result

      Result	Proceed to
      Other than 0 (history record is present)	A
      0 (no history record is present)	B

   
   

   A

   GO TO POWER STEERING SYSTEM Click here

   B

2. CHECK AIR CONDITIONING SYSTEM TYPE

   
   

   1. Check the air conditioning system type.

      Result

      Result	Proceed to
      Automatic Air Conditioning System	A
      Manual Air Conditioning System	B

   
   

   B

   CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY) Click here

   A

3. CHECK FOR DTC

   
   

   1. Check for DTCs.

      Result

      Result	Proceed to
      DTC is not output	A
      LIN DTC is output	B

   
   

   B

   GO TO LIN COMMUNICATION SYSTEM Click here

   A

4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEF RELAY)

   
   

   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/ON	-

   2. Check that operation sound of the DEF relay is heard.

      Result

      Result	Proceed to
      The window defogger system operates normally when operating it through the intelligent tester.	A
      The window defogger system does not operate normally when operating it through the intelligent tester and DEF relay operating sound is not heard.	B
      The window defogger system does not operate normally when operating it through the intelligent tester and DEF relay operating sound is heard.	C

   
   

   B

   CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY) Click here

   C

   CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - MAIN BODY ECU AND BODY GROUND) Click here

   A

5. REPLACE AIR CONDITIONING CONTROL ASSEMBLY

   
   

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

   
   

   NEXT

6. CHECK WINDOW DEFOGGER SYSTEM

   
   

   1. Turn the ignition switch to 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 is functioning normally.

   
   

   NG

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   OK

   END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Main Body ECU)

      Disconnect the DG main body ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition DG-1 - Body ground Always 11 to 14 V

      Result

      Result	Proceed to
      OK (for Automatic Air Conditioning System)	A
      OK (for Manual Air Conditioning System)	B
      NG	C

   
   

   B

   CHECK HARNESS AND CONNECTOR (HEATER CONTROL - MAIN BODY ECU) Click here

   C

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   A

8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - MAIN BODY ECU)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Air Conditioning Amplifier)
      *2	Front view of wire harness connector (to Main Body ECU)

      Disconnect the DQ main body ECU connector.

   2. Disconnect the H46 air conditioning amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H46-38 (RDFG) - DQ-12 Always Below 1 Ω H46-1 (IG+) - DQ-10 H46-38 (RDFG) - Body ground Always 10 kΩ or higher H46-1 (IG+) - Body ground

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Air Conditioning Amplifier)

      Reconnect the H46 air conditioning amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition H46-38 (RDFG) - Body ground Ignition switch ON 11 to 14 V

   
   

   NG

   REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

   OK

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

10. CHECK HARNESS AND CONNECTOR (HEATER CONTROL - MAIN BODY ECU)

    
    
    1. 

       Text in Illustration

       *1	Front view of wire harness connector (to Heater Control)
       *2	Front view of wire harness connector (to Main Body ECU)

       Disconnect the DQ main body ECU connector.

    2. Disconnect the H65 heater control connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition H65-2 (RDEF) - DQ-12 Always Below 1 Ω H65-3 (IG+) - DQ-10 H65-5 (E) - Body ground H65-2 (RDEF) - Body ground Always 10 kΩ or higher H65-3 (IG+) - Body ground

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

11. CHECK HARNESS AND CONNECTOR (HEATER CONTROL - BATTERY AND BODY GROUND)

    
    
    1. 

       Text in Illustration

       *1	Front view of wire harness connector (to Heater Control)

       Reconnect the H65 heater control connector.

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

       Standard Voltage
       Tester Connection Condition Specified Condition H65-2 (RDEF) - Body ground Ignition switch ON 11 to 14 V H65-3 (IG+) - Body ground

    
    

    NG

    CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - MAIN BODY ECU AND BODY GROUND) Click here

    OK

    REPLACE HEATER CONTROL SUB-ASSEMBLY Click here

12. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - MAIN BODY ECU AND BODY GROUND)

    

    
    

    1. Disconnect the DF main body ECU connector.

    2. Disconnect the S1 and S2 rear window defogger wire connectors.

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

       Standard Resistance
       Tester Connection Condition Specified Condition S1-1 (B) - DF-2 Always Below 1 Ω S2-1 (E) - Body ground S1-1 (B) - Body ground Always 10 kΩ or higher

       Text in Illustration

       *1

       Front view of wire harness connector (to Main Body ECU)

       *2

       Front view of wire harness connector (to Back Door Glass)

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

13. CHECK HARNESS AND CONNECTOR (WINDOW DEFOGGER WIRE)

    
    
    1. 

       Text in Illustration

       *1	Front view of wire harness connector (to Back Door Glass)

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

       Standard Voltage
       Tester Connection Switch Condition Specified Condition S1-1 (B) - Body ground Ignition switch ON and defogger switch on 11 to 14 V

    
    

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    OK

    REPLACE BACK DOOR GLASS Click here