WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DTC Code DTC Name
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 defogger relay to operate the window defogger system.

WIRING DIAGRAM

B281050E06

CAUTION / NOTICE / HINT

Note:

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

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

PROCEDURE

  1. CHECK AIR CONDITIONING SYSTEM

    1. Check the air conditioning system.

      Tip:

      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

      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 DEFOGGER RELAYClick here

    OK

  3. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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

      Click here

    2. Check that the window defogger system operates normally.

      OK

      The window defogger system operates normally.

    Result

    Proceed to

    OK

    NG
    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY

    Click here

  4. INSPECT DEFOGGER RELAY

    1. Inspect the defogger relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE DEFOGGER RELAY

    OK

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

    1. B319575C02

      *1

      Engine Room Relay Block and Junction Block Assembly

      *a

      Defogger Relay Holder

      Remove the defogger 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

      Defogger relay holder terminal-1 - Body ground

      Ignition switch ON

      11 to 14 V

      Defogger relay holder terminal-5 - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. B319575C02

      *1

      Engine Room Relay Block and Junction Block Assembly

      *a

      Defogger Relay Holder

      Disconnect the E28 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

      Defogger relay holder terminal-2 - E28-38 (RDFG)

      Always

      Below 1 Ω

      Defogger relay holder terminal-2 - Body ground

      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. E182281C10

      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the E28 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

      E28-38 (RDFG) - E28-14 (GND)

      Ignition switch ON, rear window defogger switch on

      Below 1 V

      E28-38 (RDFG) - E28-14 (GND)

      Ignition switch ON, 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) - DEFOGGER RELAY AND BODY GROUND)

    1. B319575C02

      *1

      Engine Room Relay Block and Junction Block Assembly

      *a

      Defogger Relay Holder

      Disconnect the Q1 and Q2 back door glass (rear window defogger wire) connectors.

    2. Remove the defogger relay from the engine room relay block and junction block assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Q1-1 (B) - Defogger relay holder terminal-3

      Always

      Below 1 Ω

      Q2-1 (E) - Body ground

      Always

      Below 1 Ω

      Q1-1 (B) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

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

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR