Rear Window Defogger System does not Operate [06/2016 - 03/2017]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body / Main Body / Active Test.
5. According to the display on the Techstream, perform the Active Test.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Rear Defogger	RR DEF relay	OFF or ON	-

   OK

   The window defogger system operates normally.

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

Result: 

B 

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [06/2016 - 03/2017] )

Result: 

A 

See step  2

1. Remove the RR DEF relay from the engine room relay block.
2. Inspect the RR DEF relay (Refer to ON-VEHICLE INSPECTION [06/2016 - ] ).

Result: 

NG 

REPLACE RELAY (RR DEF) 

Result: 

OK 

See step  3

1. Remove the RR DEF relay from the engine room relay block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   1 - Body ground	Ignition switch ON	11 to 14 V
   3 - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block
   *2	RR DEF Relay

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the RR DEF relay from the engine room relay block assembly.
2. Disconnect the A73 main body ECU (network gateway ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   2 - A73-24 (RDEF)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   2 or A73-24 (RDEF) - Body ground	Always	10 kΩ higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the D6 main body ECU (network gateway ECU) connector.
2. Disconnect the D22 heater control sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   D6-5 (RDSW) - D22-2 (RDEF+)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D6-5 (RDSW) or D22-2 (RDEF+) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Remove the heater control sub-assembly (Refer to REMOVAL [06/2016 - 03/2017] ).
2. Inspect the heater control sub-assembly (Refer to INSPECTION [06/2016 - ] ).

Result: 

NG 

REPLACE HEATER CONTROL SUB-ASSEMBLY 

(Refer to REMOVAL [06/2016 - 03/2017] )

Result: 

OK 

See step  7

1. Disconnect the G10 and H29 rear window defogger connector.
2. Remove the RR DEF relay from the engine room relay block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   G10-1 - 5	Always	Below 1 Ω
   H29-1 - Body ground	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   G10-1 or 5 - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPAIR OR REPLACE BACK WINDOW GLASS (REAR WINDOW DEFOGGER) 

(Refer to REMOVAL [06/2016 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR