WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DTC Code DTC Name
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

B456360E01
B224595E03

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following 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.

      Table 1. 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

      -
      Table 2. Result

      Result

      Proceed to

      Other than 0 (history record is present)

      A

      0 (no history record is present)

      B

    GO TO POWER STEERING SYSTEM

    (Click here)

  2. CHECK AIR CONDITIONING SYSTEM TYPE

    1. Check the air conditioning system type.

      Table 3. Result

      Result

      Proceed to

      Automatic Air Conditioning System

      A

      Manual Air Conditioning System

      B

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

  3. CHECK FOR DTC

    1. Check for DTCs.

      Table 4. Result

      Result

      Proceed to

      DTC is not output

      A

      LIN DTC is output

      B

    GO TO LIN COMMUNICATION SYSTEM

    (Click here)

  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.

      Table 5. 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.

      Table 6. 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

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

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

  5. REPLACE AIR CONDITIONING CONTROL ASSEMBLY

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

  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.

    END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)

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

    1. U122432E02

      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
      Table 7. Text in Illustration

      *1

      Front view of wire harness connector

      (to Main Body ECU)
      Table 8. Result

      Result

      Proceed to

      OK (for Automatic Air Conditioning System)

      A

      OK (for Manual Air Conditioning System)

      B

      NG

      C

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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U122516E02

      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
      Table 9. 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)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U124115E02

      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
      Table 10. Text in Illustration

      *1

      Front view of wire harness connector

      (to Air Conditioning Amplifier)

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

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

    1. U122518E02

      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
      Table 11. Text in Illustration

      *1

      Front view of wire harness connector

      (to Heater Control)

      *2

      Front view of wire harness connector

      (to Main Body ECU)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U122517E02

      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
      Table 12. Text in Illustration

      *1

      Front view of wire harness connector

      (to Heater Control)

    REPLACE HEATER CONTROL SUB-ASSEMBLY

    (Click here)

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

    U122529E02

    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
      Table 13. 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)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. CHECK HARNESS AND CONNECTOR (WINDOW DEFOGGER WIRE)

    1. U122439E02

      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
      Table 14. Text in Illustration

      *1

      Front view of wire harness connector

      (to Back Door Glass)

    REPLACE BACK DOOR GLASS

    (Click here)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)