WINDSHIELD DEICER SYSTEM > Windshield Deicer does not Operate

for Preparation Click here


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.
  1. *1: w/ Navigation System
  2. *2: w/o Navigation System

WIRING DIAGRAM


B267910E02


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. 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).
  3. If the battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system (Click here).

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

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

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

  1. 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
GO TO AIR CONDITIONING SYSTEM (Proceed to Problem Symptoms Table) (Click here)

C
Go to step 5
A


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


    B267908E01

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

  1. 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

    Text in Illustration 
    *a
    		Component without harness connected
    (Front Wiper Deicer Switch (Outer Mirror Heater Switch Assembly))



NG
REPLACE FRONT WIPER DEICER SWITCH (OUTER MIRROR HEATER SWITCH ASSEMBLY) (Click here)
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
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the H85 air conditioning amplifier assembly connector.

  1. 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
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)  

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

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

  1. 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
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the H85 air conditioning amplifier assembly connector.

  1. 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
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK NO. 1 INTEGRATION RELAY

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

  1. 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
REPLACE NO. 1 INTEGRATION RELAY (Click here)
OK


8.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    B202140E22

  1. Reconnect the H85 air conditioning amplifier assembly connector.

  1. 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)
    1. Power switch on (IG), windshield deicer switch on*1
    2. Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) on*2
    		Below 1 V
    H85-39 (HRLY) - H85-14 (GND)
    1. Power switch on (IG), windshield deicer switch off*1
    2. Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) off*2
    		11 to 14 V

    1. *1: w/ Navigation System
    2. *2: w/o Navigation System
    Text in Illustration 
    *a
    		Rear view of wire harness connector
    (to Air Conditioning Amplifier Assembly)



NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK


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

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

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

  1. 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
REPAIR OR REPLACE HARNESS OR CONNECTOR
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
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.CHECK NO. 1 INTEGRATION RELAY

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

  1. 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
    1. Power switch on (IG), windshield deicer switch on*1
    2. Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) on*2
    		11 to 14 V
    A59-4 (B) - Body ground
    1. Power switch on (IG), windshield deicer switch off*1
    2. Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) off*2
    		Below 1 V
    A59-5 (B2) - Body ground
    1. Power switch on (IG), windshield deicer switch on*1
    2. Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) on*2
    		11 to 14 V
    A59-5 (B2) - Body ground
    1. Power switch on (IG), windshield deicer switch off*1
    2. Power switch on (IG), front wiper deicer switch (outer mirror heater switch assembly) off*2
    		Below 1 V

    1. *1: w/ Navigation System
    2. *2: w/o Navigation System



NG
Go to step 12
OK

REPLACE WINDSHIELD DEICER WIRE (WINDSHIELD GLASS) (Click here)  

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
REPAIR OR REPLACE HARNESS OR CONNECTOR (DCDC LINE)
OK

END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)