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

A00416LE03

INSPECTION PROCEDURE

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 REAR WINDOW DEFOGGER SYSTEM


    1. Activate the rear defogger system and check the symptoms.

      Result
      Result Proceed to
      Both back window defoggers do not warm up. A
      The back door glass defogger does not warm up. B
      The back window fix glass defogger does not warm up. C

    B

    CHECK HARNESS AND CONNECTOR (NO.1 INTEGRATION RELAY - REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS)) Click here

    C

    CHECK HARNESS AND CONNECTOR (NO.1 INTEGRATION RELAY - REAR WINDOW DEFOGGER WIRE (BACK WINDOW FIX GLASS)) Click here

    A

  2. 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

  3. PERFORM ACTIVE TEST USING GTS (DEFOGGER RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Defogger Relay (Rear) Rear window defogger OFF or ON Operate with power switch on (IG)
      OK
      The rear window defogger system operates normally.

    NG

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

    OK

  4. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Temporarily replace the air conditioning amplifier assembly with a new or known good one Click here.

    2. Check that the rear window defogger system operates normally.

      OK
      The rear window defogger system operates normally.

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

  5. 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

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


    1. Disconnect the L14 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
      L14-20 (RDFG) - 1G-15 (DEF) Always Below 1 Ω
      1G-15 (DEF) - Body ground Always 10 kΩ or higher
      L14-14 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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
      L14-20 (RDFG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A00436NE28
      Text in Illustration
      *a

      Component with harness connected

      (to Air Conditioning Amplifier Assembly)

      Reconnect the L14 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
      L14-20 (RDFG) - L14-14 (GND) Power switch on (IG), rear window defogger switch off 11 to 14 V
      L14-20 (RDFG) - L14-14 (GND) Power switch on (IG), rear window defogger switch on Below 2 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - REAR WINDOW DEFOGGER WIRE)


    1. Disconnect the V1 rear window defogger wire (back door glass) connector.

    2. Disconnect the V2 rear window defogger wire (back window fix glass) connector.

    3. Disconnect the 1I No. 1 integration relay 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) - V1-1 Always Below 1 Ω
      1I-1 (RDEF) - V2-1 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO.1 INTEGRATION RELAY Click here

  10. CHECK HARNESS AND CONNECTOR (NO.1 INTEGRATION RELAY - REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS))


    1. Disconnect the V1 and V10 rear window defogger wire (back door glass) connectors.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1l-1 (RDEF) - V1-1 Always Below 1 Ω
      V10-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  11. CHECK HARNESS AND CONNECTOR (NO.1 INTEGRATION RELAY - REAR WINDOW DEFOGGER WIRE (BACK WINDOW FIX GLASS))


    1. Disconnect the V2 and V8 rear window defogger wire (back window fix glass) connectors.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1l-1 (RDEF) - V2-1 Always Below 1 Ω
      V8-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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