WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION


WIRING DIAGRAM

A01G8QME04

INSPECTION PROCEDURE

Note


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

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

  • The window defogger system uses the AVC-LAN and LIN communication. First, confirm that there are no malfunctions in the AVC-LAN and LIN communication lines. Refer to How to Proceed with Troubleshooting Click here.*1

  • 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 Click here.*2


    • *1: w/o Multi-display

    • *2: w/ Multi-display

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 through same communication line.

      OK
      The air conditioning system operates normally.

    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 engine 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 -
      OK
      The window defogger system operates normally.

    NG

    CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click 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
      Result Proceed to
      OK A
      NG (w/o Multi-display) B
      NG (w/ Multi-display) C

    B

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    C

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    A

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

  4. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Using a voltmeter, check the signal reading of the engine room junction block assembly Click here.

      OK
      Output signal reading is normal.

    NG

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK ASSEMBLY - POWER SOURCE AND BODY GROUND)


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

      A01G71KE04
      Text in Illustration
      *a

      Component without engine room junction block assembly

      (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
      A-1 (BATT) - Body ground Always 11 to 14 V
      B-1 (ALT) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1F-3 (GND1) - Body ground Always Below 1 Ω
      1G-4 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ENGINE ROOM JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the H54 air conditioning amplifier assembly connector.

    2. Disconnect the 1F engine room junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-38 (RDFG) - 1F-4 (DEFS) Always Below 1 Ω
      1F-4 (DEFS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Reconnect the 1F engine room junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H54-38 (RDFG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the H54 air conditioning amplifier assembly connector.

    2. A01G7DSE16
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H54-38 (RDFG) - H54-14 (GND) Engine switch on (IG), rear window defogger switch off 11 to 14 V
      H54-38 (RDFG) - H54-14 (GND) Engine switch on (IG), rear window defogger switch on Below 2.2 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - REAR WINDOW DEFOGGER WIRE)


    1. Disconnect the P18 back window glass (rear window defogger wire) battery side connector.

    2. Disconnect the 1N engine room junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1N-1 (RDEF) - P18-1 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Reconnect the 1N engine room junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P18-1 - Body ground Engine switch on (IG), rear window defogger switch on 11 to 14 V
      P18-1 - Body ground Engine switch on (IG), rear window defogger switch off Below 1 V

    NG

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

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


    1. Disconnect the R1 back window glass (rear window defogger wire) ground side connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R1-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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