Windshield Deicer System Windshield Deicer Does Not Operate

Vehicle Exterior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Window Glass. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEICER RELAY [FRONT])

CHECK AIR CONDITIONING CONTROL ASSEMBLY

CHECK NAVIGATION SYSTEM

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

INSPECT DEICER RELAY

CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)

CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER WIRE] - DEICER RELAY AND BODY GROUND)

CHECK WINDSHIELD GLASS (WINDSHIELD DEICER WIRE)

WINDSHIELD DEICER SYSTEM - Windshield Deicer does not Operate


DESCRIPTION

When the windshield deicer switch is turned on, a windshield deicer activation request signal is sent via the LIN communication line*1 or CAN communication line*2 to the air conditioning amplifier assembly. Then the air conditioning amplifier assembly operates the windshield deicer. When the on signal from the windshield deicer switch is received, the DEICER relay is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the DEICER relay operation is stopped.
  1. *1: w/o Navigation System
  2. *2: w/ Navigation System

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Window Glass.Power Window Control System (For Models With Jam Protection Function On 4 Windows).Windshield Deicer System Windshield Deicer Does Not Operate


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication and LIN communication malfunctions before troubleshooting this symptom.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEICER RELAY [FRONT])

  1. Select the Active Test using the intelligent tester to generate a control command, and then check that the windshield deicer operates (Click here).

    Air Conditioner
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Deicer Relay (Front)
    		DEICER relay operation
    		OFF or ON
    		-
    OK:
    The windshield deicer system operates normally.
    Result
    Result
    		Proceed to
    OK (w/o Navigation System)
    		A
    OK (w/ Navigation System)
    		B
    NG
    		C


B
Go to step 3

C
Go to step 6
A


2.CHECK AIR CONDITIONING CONTROL ASSEMBLY

  1. Temporarily replace the air conditioning control assembly with a new or normally functioning one (Click here).

  1. Turn the ignition switch to ON.

  1. Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

  1. Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

    OK:
    Windshield deicer system functioning normally.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

3.CHECK NAVIGATION SYSTEM

  1. Check if the navigation system functioning normally (Click here).

    OK:
    Navigation system functioning normally.


NG
GO TO NAVIGATION SYSTEM (Click here)
OK


4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

  1. Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one (Click here).

  1. Turn the ignition switch to ON.

  1. Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

  1. Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

    OK:
    Windshield deicer system functioning normally.


NG
Go to step 5
OK

END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

5.CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

  1. Temporarily replace the multi-media module receiver assembly with a new or normally functioning one (Click here).

  1. Turn the ignition switch to ON.

  1. Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

  1. Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

    OK:
    Windshield deicer system functioning normally.


NG
REPLACE MULTI-DISPLAY ASSEMBLY (Click here)
OK

END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY IS DEFECTIVE)

6.INSPECT DEICER RELAY

  1. Remove the DEICER relay from the engine room relay block (Click here).

  1. Inspect the DEICER relay (Click here).



NG
REPLACE DEICER RELAY (Click here)
OK


7.CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)

  1. Remove the DEICER relay from the engine room relay block (Click here).

  1. Disconnect the E36*1 or E81*2 air conditioning amplifier assembly connector.

    1. *1: w/ Rear Heater
    2. *2: w/o Rear Heater

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    DEICER relay terminal 2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    DEICER relay terminal 5 - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    w/ Rear Heater:
    Tester Connection
    		Condition
    		Specified Condition
    DEICER relay terminal 1 - E36-9 (FDEF)
    		Always
    		Below 1 Ω
    DEICER relay terminal 1 - Body ground
    		Always
    		10 kΩ or higher
    w/o Rear Heater:
    Tester Connection
    		Condition
    		Specified Condition
    DEICER relay terminal 1 - E81-39 (FDEF)
    		Always
    		Below 1 Ω
    DEICER relay terminal 1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER WIRE] - DEICER RELAY AND BODY GROUND)
  1. *1: w/o Heated Windshield Defroster System
  2. *2: w/ Heated Windshield Defroster System

  1. Disconnect the A23*1 or A63*2 windshield glass (windshield deicer wire) connector.

  1. Remove the DEICER relay from the engine room relay block (Click here).

  1. Remove the HWD1, HWD2, HWD3 and HWD4 relays from the No. 2 engine room relay block (Click here).*2

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

    Standard Resistance:
    w/o Heated Windshield Defroster System:
    Tester Connection
    		Condition
    		Specified Condition
    A23-1 (B) - DEICER relay terminal 3
    		Always
    		Below 1 Ω
    A23-2 (E) - Body ground
    		Always
    		Below 1 Ω
    DEICER relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher
    w/ Heated Windshield Defroster System:
    Tester Connection
    		Condition
    		Specified Condition
    A63-1 (B) - DEICER relay terminal 3
    		Always
    		Below 1 Ω
    A63-2 (E) - Body ground
    		Always
    		Below 1 Ω
    DEICER relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK WINDSHIELD GLASS (WINDSHIELD DEICER WIRE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Window Glass.Power Window Control System (For Models With Jam Protection Function On 4 Windows).Windshield Deicer System Windshield Deicer Does Not Operate

  1. Disconnect the A23 windshield glass (windshield deicer wire) connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A23-1 (B) - A23-2 (E)
    		Ignition switch ON and deicer switch on
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector:
    (to Window Glass [Windshield Deicer Wire])


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

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