WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch*1 or front wiper deicer switch (outer mirror heater switch assembly)*2 is operated, the operation signal is transmitted to the air conditioning amplifier assembly via CAN and AVC-LAN communication lines*1, or directly*2. When the air conditioning amplifier assembly receives the signal, it turns on the No. 1 integration relay to operate the windshield deicer.


WIRING DIAGRAM

A003WM6E02

INSPECTION PROCEDURE

Note


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

  • w/ Navigation System

    The windshield deicer system uses the CAN communication and AVC-LAN communication. First, confirm that there is no malfunction in the communication lines. Refer to the How to Proceed with Troubleshooting procedure Click here.

  • If the battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system Click here.

PROCEDURE


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


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester on.

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

    6. Perform the Active Test according to the display on the intelligent tester.

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

    B
    C
    A
  2. INSPECT FRONT WIPER DEICER SWITCH (OUTER MIRROR HEATER SWITCH ASSEMBLY)


    1. A003XX6E01
      Text in Illustration
      *a

      Component without harness connected

      (Front Wiper Deicer Switch (Outer Mirror Heater Switch Assembly))

      Remove the front wiper deicer switch (outer mirror heater switch assembly) Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 (IG) - 4 (ECU) Front wiper deicer switch (outer mirror heater switch assembly) on Below 1 Ω
      1 (IG) - 4 (ECU) Front wiper deicer switch (outer mirror heater switch assembly) off 10 kΩ or higher

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (FRONT WIPER DEICER SWITCH - BATTERY)


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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H36-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      H36-1 (IG) - Body ground Power switch off Below 1 V

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - FRONT WIPER DEICER SWITCH)


    1. Disconnect the H85 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
      H36-4 (ECU) - H85-36 (SW6) Always Below 1 Ω
      H85-36 (SW6) - Body ground Always 10 kΩ or higher

    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY AND BODY GROUND)


    1. Disconnect the 1G and 1H No. 1 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1G-14 (IG1) - Body ground Power switch off Below 1 V
      1G-14 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      1G-22 (GND1) - Body ground Always Below 1 Ω
      1H-3 (GND2) - Body ground Always Below 1 Ω

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - NO. 1 INTEGRATION RELAY)


    1. Disconnect the H85 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
      H85-39 (HRLY) - 1G-16 (DEC) Always Below 1 Ω
      H85-39 (HRLY) - Body ground Always 10 kΩ or higher

    NG
    OK
  7. CHECK NO. 1 INTEGRATION RELAY


    1. Reconnect the 1G and 1H No. 1 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H85-39 (HRLY) - Body ground Power switch off Below 1 V
      H85-39 (HRLY) - Body ground Power switch on (IG) 11 to 14 V

    NG
    OK
  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A003V5EE22
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the H85 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
      H85-39 (HRLY) - H85-14 (GND)
      • Power switch on (IG), windshield deicer switch on*1

      • Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) on*2

      Below 1 V
      H85-39 (HRLY) - H85-14 (GND)
      • Power switch on (IG), windshield deicer switch off*1

      • Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) off*2

      11 to 14 V

      • *1: w/ Navigation System

      • *2: w/o Navigation System


    NG
    OK
  9. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - WINDSHIELD DEICER WIRE)


    1. Disconnect the 1H No. 1 integration relay connector.

    2. Disconnect the A59 windshield deicer wire (windshield glass) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A59-4 (B) - 1H-1 (DECL) Always Below 1 Ω
      A59-5 (B2) - 1H-5 (DECR) Always Below 1 Ω
      A59-4 (B) - Body ground Always 10 kΩ or higher
      A59-5 (B2) - Body ground Always 10 kΩ or higher

    NG
    OK
  10. CHECK HARNESS AND CONNECTOR (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
      A59-2 (E) - Body ground Always Below 1 Ω

    NG
    OK
  11. CHECK NO. 1 INTEGRATION RELAY


    1. Reconnect the 1H No. 1 integration relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A59-4 (B) - Body ground
      • Power switch on (IG), windshield deicer switch on*1

      • Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) on*2

      11 to 14 V
      A59-4 (B) - Body ground
      • Power switch on (IG), windshield deicer switch off*1

      • Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) off*2

      Below 1 V
      A59-5 (B2) - Body ground
      • Power switch on (IG), windshield deicer switch on*1

      • Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) on*2

      11 to 14 V
      A59-5 (B2) - Body ground
      • Power switch on (IG), windshield deicer switch off*1

      • Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) off*2

      Below 1 V

      • *1: w/ Navigation System

      • *2: w/o Navigation System


    NG
    OK
  12. REPLACE NO. 1 INTEGRATION RELAY


    1. Replace the No. 1 integration relay Click here.


    NEXT
  13. CHECK WINDSHIELD DEICER SYSTEM


    1. Check the windshield deicer system.

      OK
      The windshield deicer system operates normally.

    NG
    OK