WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

By operating the deicer switch while the engine switch is on (IG), the windshield deicer can be activated. For vehicles with the multi-display, the operation signals are sent to the air conditioning amplifier assembly via CAN communication. For vehicles without the multi-display, the operation signals are sent directly from the front wiper deicer switch to the air conditioning amplifier assembly. The windshield deicer system is controlled by the air conditioning amplifier assembly. On receiving a deicer switch on signal, the air conditioning amplifier assembly turns on the DEICER relay for 15 minutes. If the air conditioning amplifier assembly receives a deicer switch off signal while the DEICER relay is on, it turns off the relay.

WIRING DIAGRAM

A019MNLE03

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (Battery Voltage Lo Record)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Chassis / EMPS / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      EMPS
      Tester Display Measurement item/Range Normal Condition Diagnostic Note
      Battery Voltage Lo Record Battery voltage reduction history/ Min.: 0 times, Max.: 65535 times 0 to 65535 -
      Result
      Result Proceed to
      0 (no history record is present) A
      Other than 0 (history record is present)*1 B
      Other than 0 (history record is present)*2 C

      • *1: for 2GR-FE

      • *2: for 1AR-FE


    B

    GO TO CHARGING SYSTEM (for 2GR-FE) Click here

    C

    GO TO CHARGING SYSTEM (for 1AR-FE) Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT DEICER RELAY)


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

    2. Using the intelligent tester, perform the Active Test.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Deicer Relay (Front) Deicer relay ON / OFF -
      Result
      Result Proceed to
      Windshield deicer operates. (w/o Multi-display) A
      Windshield deicer operates. (w/ Multi-display) B
      Windshield deicer does not operate. C

    B

    GO TO AIR CONDITIONING SYSTEM Click here

    C

    CHECK FRONT WIPER DEICER RELAY Click here

    A

  3. INSPECT FRONT WIPER DEICER SWITCH


    1. A019PFSE07
      Text in Illustration
      *a

      Component without harness connected

      (Front Wiper Deicer Switch)

      Remove the front wiper deicer switch Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F5-1 (IG) - F5-5 (ECU) Front wiper deicer switch on Below 1 Ω
      F5-1 (IG) - F5-5 (ECU) Front wiper deicer switch off 10 kΩ or higher

    NG

    REPLACE FRONT WIPER DEICER SWITCH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR


    1. Reconnect the front wiper deicer switch connector.

    2. Disconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F51-18 (SW1) - Body ground Front wiper deicer switch on 11 to 14 V
      F51-18 (SW1) - Body ground Front wiper deicer switch off Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY POWER SOURCE) Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY POWER SOURCE)


    1. Disconnect the front wiper deicer switch connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F5-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT WIPER DEICER SWITCH POWER SOURCE)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT WIPER DEICER SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  6. CHECK FRONT WIPER DEICER RELAY


    1. A019KTZE02

      Remove the DEICER relay from the engine room relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Engine room relay block DEICER relay terminal 3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 Ω
      Engine room relay block DEICER relay terminal 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher

    NG

    REPLACE FRONT WIPER DEICER RELAY

    OK

  7. CHECK HARNESS AND CONNECTOR (DEICER RELAY TERMINAL - BODY GROUND)


    1. A019K1TE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Room Relay Block Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Engine room relay block DEICER relay terminal 1 - Body ground Engine switch off Below 1 V
      Engine room relay block DEICER relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (DEICER RELAY TERMINAL - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A019NLVE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Room Relay Block Assembly)
      *b

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the F50 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
      Engine room relay block DEICER relay terminal 2 - F50-40 (FDEF) Always Below 1 Ω
      Engine room relay block DEICER relay terminal 2 - Body ground Always 10 kΩ or higher
      F50-14 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A019OAOE26
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the DEICER relay.

    2. Reconnect the F50 air conditioning amplifier assembly connector.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F50-40 (FDEF) - F50-14 (GND) Deicer switch on Below 1 V
      F50-40 (FDEF) - F50-14 (GND) Deicer switch off 11 to 14 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (DEICER RELAY TERMINAL - BODY GROUND)


    1. A019K1TE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Room Relay Block Assembly)

      Remove the DEICER relay from the engine room relay block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Engine room relay block DEICER relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (DEICER RELAY TERMINAL - WINDSHIELD GLASS (WINDSHIELD DEICER)


    1. A019OGPE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Room Relay Block Assembly)
      *b

      Front view of wire harness connector

      (to Windshield Glass (Windshield Deicer Wire))

      Remove the DEICER relay from the engine room relay block assembly.

    2. Disconnect the A35 windshield glass (windshield deicer wire) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Engine room relay block DEICER relay terminal 3 - A35-1 (B2) Always Below 1 Ω
      Engine room relay block DEICER relay terminal 3 - A35-3 (B) Always Below 1 Ω
      A35-1 (B2) - Body ground Always 10 kΩ or higher
      A35-3 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A35-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) Click here