WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the air conditioning control panel is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through a LIN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the No. 1 integration relay to operate the rear window defogger.

WIRING DIAGRAM

A004W4SE04

CAUTION / NOTICE / HINT

Note


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

  • If the auxiliary battery voltage becomes low, rear window defogger operation is canceled to prioritize supplying power to the power steering system.

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      Tech Tips

      Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly through the same communication line.

      OK
      The air conditioning system operates normally.

    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEFOGGER RELAY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Air Conditioner (Air Conditioning Amplifier Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Defogger Relay (Rear) Rear window defogger OFF or ON -
      OK
      The rear window defogger system operates normally.

    OK

    REPLACE AIR CONDITIONING CONTROL PANEL (CENTER CLUSTER MODULE CIRCUIT) Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND)


    1. Disconnect the 1G and 1H No. 1 integration relay connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1H-7 (BATT) - Body ground Power switch off 11 to 14 V
      1G-14 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      1G-14 (IG1) - Body ground Power switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      1G-22 (GND1) - Body ground Always Below 1 Ω
      1H-3 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - NO. 1 INTEGRATION RELAY)


    1. Disconnect the H85 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H85-20 (SW7) - 1G-15 (DEF) Always Below 1 Ω
      1G-15 (DEF) - Body ground Always 10 kΩ or higher
      H85-14 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK NO. 1 INTEGRATION RELAY


    1. Reconnect the 1G and 1H No. 1 integration relay connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H85-20 (SW7) - Body ground Always 11 to 14 V

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A005017E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the H85 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H85-20 (SW7) - H85-14 (GND) Power switch on (IG), rear window defogger switch off 11 to 14 V
      H85-20 (SW7) - H85-14 (GND) Power switch on (IG), rear window defogger switch on Below 1 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - NOISE FILTER)


    1. Disconnect the 1I No. 1 integration relay connector.

    2. Disconnect the P32 noise filter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1I-1 (RDEF) - P32-1 (DEF+) Always Below 1 Ω
      1I-1 (RDEF) - Body ground Always 10 kΩ or higher
      P32-1 (DEF+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK NO. 1 INTEGRATION RELAY


    1. Reconnect the 1I No. 1 integration relay connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P32-1 (DEF+) - Body ground Power switch on (IG), rear window defogger switch on 11 to 14 V
      P32-1 (DEF+) - Body ground Power switch on (IG), rear window defogger switch off Below 1 V

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  9. INSPECT NOISE FILTER


    1. A004W84E02
      Text in Illustration
      *1 Body
      *a

      Component without harness connected

      (Noise Filter)

      Remove the noise filter.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (DEF+) - 2 (DEF) Always Below 1 Ω
      1 (DEF+) - Body ground Always 10 kΩ or higher
      2 (DEF) - Body ground Always 10 kΩ or higher

    NG

    REPLACE NOISE FILTER

    OK

  10. INSPECT RADIO SETTING CONDENSER


    1. Remove the radio setting condenser Click here.

    2. A004XHVE05
      Text in Illustration
      *a Radio Setting Condenser

      Measure the resistance of the radio setting condenser according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 10 kΩ or higher
      2 - 3 Always Below 1 Ω

    NG

    REPLACE RADIO SETTING CONDENSER Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (NOISE FILTER - REAR WINDOW DEFOGGER WIRE)


    1. Disconnect the V10 rear window defogger wire (back door glass) auxiliary battery side connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P32-2 (DEF) - V10-1 Always Below 1 Ω
      P32-2 (DEF) - Body ground Always 10 kΩ or higher
      V10-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - BODY GROUND)


    1. Disconnect the V7 rear window defogger wire (back door glass) ground side connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V7-1 - Body ground Always Below 1 Ω

    OK

    REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. REPLACE NO. 1 INTEGRATION RELAY


    1. Replace the No. 1 integration relay Click here.


    NEXT

  14. CHECK WINDOW DEFOGGER SYSTEM


    1. Check the operation of the window defogger system.

      OK
      The rear window defogger system operates normally.

    OK

    END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE)