Window Defogger System Rear Window Defogger System Does Not Operate

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEFOGGER RELAY [REAR])

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY

INSPECT DEF RELAY

CHECK HARNESS AND CONNECTOR (DEF RELAY - BATTERY AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - DEF RELAY AND BODY GROUND)

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - DEF RELAY AND BODY GROUND)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   
2. Since the window defogger system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.
   

1. Using the intelligent tester, perform the Active Test (LandCruiser RM000002ZCD04KX.html).
   
   

   Air Conditioner

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	DEF relay operation	OFF/ON	-

   OK:

   The DEF relay operates normally.
   

1. Temporarily replace the heater control with a new or normally functioning one (LandCruiser RM000003B4601YX.html).
   

2. Check the rear defogger function.
   

   OK:

   The window defogger function operates normally.
   

1. Remove the DEF relay from the engine room relay block, junction block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage applied between terminals 1 and 2	Below 1 Ω
   3 - 5	Battery voltage not applied between terminals 1 and 2	10 kΩ or higher

1. Remove the DEF relay from the engine room relay block, junction block.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   DEF relay terminal 2 - Body ground	Ignition switch off	Below 1 V
   DEF relay terminal 2 - Body ground	Ignition switch ON	11 to 14 V
   DEF relay terminal 5 - Body ground	Always	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to DEF Relay)

1. Disconnect the G25 air conditioning amplifier connector.
   

2. Remove the DEF relay from the engine room relay block, junction block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   DEF relay terminal 1 - G25-38 (RDEF)	Always	Below 1 Ω
   G25-14 (GND) - Body ground	Always	Below 1 Ω
   G25-38 (RDEF) - Body ground	Always	10 kΩ or higher

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   G25-38 (RDEF) - G25-14 (GND)	Ignition switch ON, defogger switch on	11 to 14 V
   G25-38 (RDEF) - G25-14 (GND)	Ignition switch ON, defogger switch off	Below 1 V

   Text in Illustration

   *a	Component with harness connected (Air Conditioning Amplifier Assembly)

1. Disconnect the Y2*1 or X7*2 and X8*2 back door glass (window defogger wire) connectors.
   

   1. *1: w/ Glass Hatch Opener System
      
   2. *2: w/o Glass Hatch Opener System
      

2. Remove the DEF relay and MIR HTR relay* from the engine room relay block, junction block.
   

1. *: w/ Mirror Heater
   

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

   Standard Resistance:

   w/ Glass Hatch Opener System

   Tester Connection	Condition	Specified Condition
   DEF relay terminal 3 - Y2-2	Always	Below 1 Ω
   Y2-1 - Body ground	Always	Below 1 Ω
   Y2-2 - Body ground	Always	10 kΩ or higher

   w/o Glass Hatch Opener System

   Tester Connection	Condition	Specified Condition
   DEF relay terminal 3 - X7-1	Always	Below 1 Ω
   X8-1 - Body ground	Always	Below 1 Ω
   X7-1 - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   OK (w/ Glass Hatch Opener System)	A
   OK (w/o Glass Hatch Opener System)	B
   NG	C