Rear Window Defogger System does not Operate: 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 / Air Conditioner / Active Test.
5. Perform the Active Test according to the display on the Techstream.
   AIR CONDITIONER (A/C AMPLIFIER ASSEMBLY)
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Rear window defogger	ON or OFF	-

   Result

   Result	Proceed to
   The window defogger system operates normally when operating it using the Techstream.	A
   The window defogger system does not operate normally when operating it using the Techstream.	B

B → See step   5 

A: Go to next step 

1. Disconnect the A/C control assembly and A/C amplifier assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D37-22 (LIN1) - D59-3 (LIN1)	Always	Below 1 Ω
   D37-22 (LIN1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the A/C control assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Turn the ignition switch to ON, press the rear window defogger switch, and check that the rear window defogger operates.

   OK

   Rear window defogger system operates normally.

NG → See step   16 

OK → END (A/C CONTROL ASSEMBLY WAS DEFECTIVE) 

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 / Air Conditioner / Active Test.
5. Perform the Active Test according to the display on the Techstream.
   AIR CONDITIONER (A/C AMPLIFIER ASSEMBLY)
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Rear window defogger	ON or OFF	-

6. Check that operation sound of the RR DEF relay is heard.

   Result

   Result	Proceed to
   Relay operating sound is not heard.	A
   Relay operating sound is heard.	B

B → See step   10 

A: Go to next step 

1. Remove the RR DEF relay from the engine room relay block.
   Fig 1: Identifying Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Condition	Specified Condition
   3 - 5	10 kΩ or higher (when battery voltage is not applied between terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied between terminals 1 and 2)

   TEXT IN ILLUSTRATION
   
   

   *1	RR DEF Relay

NG → REPLACE RR DEF RELAY 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (RR DEF Relay - Battery)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Engine room R/B RR DEF relay terminal 1 - Body ground	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block and Junction Block

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the engine room relay block and junction block.

NEXT: Go to next step 

1. Turn the ignition switch to ON, press the rear window defogger switch, and check that the rear window defogger operates.

   OK

   Rear window defogger system operates normally.

NG → See step   16 

OK → END (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK WAS DEFECTIVE) 

1. Disconnect the noise filter connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K15-1 - Body ground	Ignition switch ON and rear window defogger switch on	11 to 14 V

NG → See step   14 

OK: Go to next step 

1. Remove the noise filter.
   Fig 3: Identifying Noise Filter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	Below 1 Ω
   1 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Noise Filter)

NG → REPLACE NOISE FILTER 

OK: Go to next step 

1. Disconnect the defogger wire connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K15-2 - K19-1	Always	Below 1 Ω
   K15-2 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the defogger wire connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q1-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPAIR OR REPLACE WINDOW DEFOGGER WIRE 

1. Remove the RR DEF relay from the engine room relay block.
   Fig 4: Identifying Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Condition	Specified Condition
   3 - 5	10 kΩ or higher (when battery voltage is not applied between terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied between terminals 1 and 2)

   TEXT IN ILLUSTRATION
   
   

   *1	RR DEF Relay

NG → REPLACE RR DEF RELAY 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 5: Checking Harness And Connector (RR DEF Relay - Battery)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Engine room R/B RR DEF relay terminal 5 - Body ground	ignition switch off	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block and Engine Room Junction Block

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (RR DEF RELAY - NOISE FILTER)