WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the radio and display receiver assembly*1 or air conditioning control assembly*2 is pressed, the operation signal is transmitted to the air conditioning amplifier assembly via CAN communication*1 or LIN communication*2. When the air conditioning amplifier assembly receives the signal, it turns on the DEF relay to operate the window defogger system.



WIRING DIAGRAM

B00701DE02

CAUTION / NOTICE / HINT

Note


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

  • If the battery voltage is low, the window defogger system may not operate due to operation of battery load control, check the Data List item "Battery Control Count (Body ECU)".

    Click here

  • The window defogger system uses the CAN communication. First, confirm that there is no malfunction in the CAN communication line. Refer to How to Proceed with Troubleshooting.

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 ignition switch to ON.

    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 (Back window glass) OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Defogger Relay (Rear)
      OK
      The window defogger system operates normally.
      Result
      Result Proceed to
      OK (except 8 Inch Display) A
      OK (for 8 Inch Display) B
      NG C

    B

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    C

    INSPECT DEF RELAY Click here

    A

  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. REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Replace the radio and display receiver 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 (RADIO AND DISPLAY RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  5. INSPECT DEF RELAY


    1. Inspect the DEF relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DEF RELAY

    OK

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


    1. B006Y8MC01
      *a DEF Relay Holder

      Remove the DEF relay from the engine room relay block and junction block assembly.

    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 Ignition switch ON 11 to 14 V
      DEF relay holder terminal-5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B006Y8MC01
      *a DEF Relay Holder

      Remove the DEF relay from the engine room relay block and junction block assembly.

    2. Disconnect the K54 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DEF relay holder terminal-1 - K54-5 (RDFG) Always Below 1 Ω
      DEF relay holder terminal-1 or K54-5 (RDFG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B006Y8MC01
      *a DEF Relay Holder

      Remove the DEF relay from the engine room relay block and junction block assembly.

    2. Disconnect the R25 rear window defogger wire (back window glass) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DEF relay holder terminal-3 - R25-1 (B) Always Below 1 Ω
      DEF relay holder terminal-3 or R25-1 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE (BACK WINDOW GLASS) - BODY GROUND)


    1. Disconnect the S1 rear window defogger wire (back window glass) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S1-1 (L) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. B006WXEC15
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the K54 air conditioning amplifier assembly connector.

    2. Reinstall the DEF 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
      K54-5 (RDFG) - K54-4 (GND) Ignition switch ON, rear window defogger switch on Below 1 V
      K54-5 (RDFG) - K54-4 (GND) Ignition switch ON, rear window defogger switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here