Rear Window Defogger System does not Operate [11/2023 - ]: Procedure

1. Read the Data List according to the display on the GTS.

   Body Electrical > Power Distribution Box > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Rear Defogger Input Signal	Window defogger switch signal input condition	OFF or ON	OFF: Window defogger switch is off ON: Window defogger switch is on	-

   Body Electrical > Power Distribution Box > Data List 

   Tester Display
   Rear Defogger Input Signal

   OK

   On the GTS screen, ON or OFF is displayed accordingly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Read the Data List according to the display on the GTS.

   Body Electrical > Power Distribution Box > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Rear Defogger Output Signal	Window defogger output condition	OFF or ON	OFF: Window defogger does not operate ON: Window defogger operates	-

   Body Electrical > Power Distribution Box > Data List 

   Tester Display
   Rear Defogger Output Signal

   OK

   On the GTS screen, ON or OFF is displayed accordingly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

Refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  3

1. Disconnect the W2 and W3 back door glass (rear window defogger wire) connectors.
2. Disconnect the 8G power distribution box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W2-1 (B) - 8G-43	Always	Below 1 Ω
   W2-1 (B) or 8G-43 - Body ground	Always	10 kΩ or higher
   W3-1 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) 

Refer to REMOVAL [12/2019 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check the air conditioning system.

   For HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

   For Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

   HINT: 

   Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.

   OK

   The air conditioning system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO AIR CONDITIONING SYSTEM 

For HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

For Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

Result: 

OK 

See step  5

1. Check that the indicator illuminates when the window defogger switch is on.

   OK

   Defogger indicator illuminates.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AIR CONDITIONING CONTROL ASSEMBLY 

Refer to REMOVAL [10/2022 - ]

Result: 

OK 

See step  6

1. Perform the Active Test according to the display on the GTS.

   Body Electrical > Air Conditioner > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Rear Defogger Relay	Rear window defogger wire (Back door glass)	OFF or ON	-

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Rear Defogger Relay

   OK

   The window defogger system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIR CONDITIONING CONTROL ASSEMBLY 

Refer to REMOVAL [10/2022 - ]

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

Refer to REMOVAL [11/2023 - ]