WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the multi-media module receiver assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through a CAN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the No. 2 integration relay to operate the rear window defogger.

WIRING DIAGRAM

A01FQ57E04

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 Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.


      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system Click here.

      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 [REAR])


    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 Click here.

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

      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 window defogger system operates normally.

    NG

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND) Click here

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly with a new or normally functioning one Click here.

    2. Check the window defogger system.

      OK
      The window defogger system operates normally.

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

  5. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND)


    1. A01FQ6CE08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Disconnect the No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1G-1 (ALT) - Body ground Always 11 to 14 V
      1B-8 (IG1A) - Body ground Power switch on (IG) 11 to 14 V
      1B-8 (IG1A) - Body ground Power switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-10 (GNDB) - Body ground Always Below 1 Ω
      1A-22 (GNDA) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 2 INTEGRATION RELAY AND BODY GROUND)


    1. Disconnect the N78 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
      N78-25 (RDEF) - 1A-26 (DEF) Always Below 1 Ω
      N78-25 (RDEF) - Body ground Always 10 kΩ or higher
      N78-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK NO. 2 INTEGRATION RELAY


    1. A01FUFKE08
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the 1A, 1B and 1G No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N78-25 (RDEF) - Body ground Power switch off Below 1 V
      N78-25 (RDEF) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPLACE NO. 2 INTEGRATION RELAY Click here

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01FV8EE09
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly Click here.

    2. Reconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N78-25 (RDEF) - N78-1 (GND)

      • Power switch on (IG)

      • Rear window defogger switch on

      		 Below 2.2 V
      N78-25 (RDEF) - N78-1 (GND)

      • Power switch on (IG)

      • Rear window defogger switch off

      		 11 to 14 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BACK WINDOW GLASS)


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

    2. Disconnect the U23 back window glass connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1C-1 (RDEF) - U23-1 (B) Always Below 1 Ω
      1C-1 (RDEF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS - BODY GROUND)


    1. A01FR3XE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Back Window Glass)

      Disconnect the back window glass connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T23-1 (L) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK NO. 2 INTEGRATION RELAY


    1. A01FR3XE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Back Window Glass)

      Reconnect the 1C No. 2 integration relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U23-1 (B) - Body ground

      • Power switch on (IG)

      • Rear window defogger switch on

      		 11 to 14 V
      U23-1 (B) - Body ground

      • Power switch on (IG)

      • Rear window defogger switch off

      		 Below 1 V

    NG

    REPLACE NO. 2 INTEGRATION RELAY Click here

    OK

    REPLACE BACK WINDOW GLASS Click here