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 via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the DEF relay to operate the window defogger system.

WIRING DIAGRAM

A001QMCE01

CAUTION / NOTICE / HINT

Note


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

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

    Click here

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 via the same communication line.

      OK
      The air conditioning system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS


    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.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Defogger Relay (Rear) Rear window defogger wire OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Defogger Relay (Rear)
      OK
      The window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT DEF RELAY Click here

    OK

  3. REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace the air conditioning control assembly with a new or known good one.

      Click here

    2. Check that the window defogger system operates normally.

      Click here

      OK
      The window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  4. INSPECT DEF RELAY


    1. Remove the DEF relay from the No. 2 engine room relay block.

    2. Inspect the DEF relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DEF RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (DEF RELAY - IG1 NO. 1 RELAY AND AUXILIARY BATTERY)


    1. A001QPWC01
      *1 No. 2 Engine Room Relay Block
      *a DEF Relay Holder

      Remove the DEF relay from the No. 2 engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DEF relay holder terminal-1 - Body ground Power switch on (IG) 11 to 14 V
      DEF relay holder terminal-5 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (DEF RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A001QPWC01
      *1 No. 2 Engine Room Relay Block
      *a DEF Relay Holder

      Disconnect the F73 air conditioning amplifier assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Defogger relay holder terminal-2 - F73-5 (RDFG) Always Below 1 Ω
      Defogger relay holder terminal-2 - F73-5 (RDFG) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A001P0QC13
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the F73 air conditioning amplifier assembly connector.

    2. Reinstall the defogger relay.

    3. Remove the air conditioning amplifier assembly with its connectors still connected.

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F73-5 (RDFG) - F73-4 (GND) Power switch on (IG), rear window defogger switch on Below 1 V
      F73-5 (RDFG) - F73-4 (GND) Power switch on (IG), rear window defogger switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) - DEF RELAY AND BODY GROUND)


    1. A001QPWC01
      *1 No. 2 Engine Room Relay Block
      *a Defogger Relay Holder

      Disconnect the S13 and S14 back door glass (rear window defogger wire) connectors.

    2. Remove the defogger relay from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S13-1 - Defogger relay holder terminal-3 Always Below 1 Ω
      S14-1 - Body ground Always Below 1 Ω
      S13-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR