WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the air conditioning control assembly 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

A003SU2E03

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      Tech Tips

      Both the window defogger system operation signal and the 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.

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY AND BODY GROUND) Click here

    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - 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 E30 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
      E30-20 (RDFG) - 1G-15 (DEF) Always Below 1 Ω
      1G-15 (DEF) - Body ground Always 10 kΩ or higher
      E30-14 (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
      E30-20 (RDFG) - Body ground Always 11 to 14 V

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A003RTIE18
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the E30 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E30-20 (RDFG) - E30-14 (GND) Power switch on (IG), rear window defogger switch off 11 to 14 V
      E30-20 (RDFG) - E30-14 (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 (WINDOW DEFOGGER WIRE - NO. 1 INTEGRATION RELAY AND GROUND)


    1. Disconnect the R1 rear window defogger wire (back door glass) connector.

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

    3. Disconnect the L48 radio setting condenser connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1I-1 (RDEF) - Body ground Always 10 kΩ or higher
      1I-1 (RDEF) - R1-1 Always Below 1 Ω
      R2-1 - Body ground Always Below 1 Ω

    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 Switch Condition Specified Condition
      R1-1 - Body ground Power switch on (IG), rear window defogger switch on 11 to 14 V
      R1-1 - Body ground Power switch on (IG), rear window defogger switch off Below 1 V

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  9. REPLACE RADIO SETTING CONDENSER


    1. Replace the radio setting condenser.


    NEXT

  10. CHECK WINDOW DEFOGGER SYSTEM


    1. Check the operation of the window defogger system.

      OK
      The rear window defogger system operates normally.

    NG

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

    OK

    END (RADIO SETTING CONDENSER WAS DEFECTIVE)

  11. REPLACE NO. 1 INTEGRATION RELAY


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


    NEXT

  12. CHECK WINDOW DEFOGGER SYSTEM


    1. Check the operation of the window defogger system.

      OK
      The rear window defogger system operates normally.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE)

    OK

    END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)