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 engine room junction block assembly to operate the window defogger system.

WIRING DIAGRAM

A01HV0JE14

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.

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.

    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING TECHSTREAM (DEFOGGER RELAY)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch to on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

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

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Defogger Relay (Rear) Rear window defogger OFF or ON -
      OK
      The rear window defogger system operates normally.

    NG

    CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  3. 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

  4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION 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.

      A01HSGPE04

    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 Power switch off 11 to 14 V
      B-1 (ALT) - Body ground Power switch off 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
      Text in Illustration
      *a

      Component without engine room junction block assembly

      (Engine Room Relay Block and Junction Block Assembly)

      		 - -

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the I77 air conditioning amplifier assembly connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I77-38 (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

  6. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY


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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I77-38 (RDFG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01HUX4E06
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the I77 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I77-38 (RDFG) - I77-14 (GND) Power switch on (IG), rear window defogger switch off 11 to 14 V
      I77-38 (RDFG) - I77-14 (GND) Power switch on (IG), rear window defogger switch on Below 2.2 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

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


    1. Disconnect the N29 rear window defogger wire (back window glass) auxiliary 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) - N29-1 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. 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 Switch Condition Specified Condition
      N29-1 - Body ground Power switch on (IG), rear window defogger switch on 11 to 14 V
      N29-1 - Body ground Power switch on (IG), rear window defogger switch off Below 1 V

    NG

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - BODY GROUND)


    1. Disconnect the P1 rear window defogger wire (back window glass) ground side connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P1-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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