Inspection Procedure

1. Check for DTC.

   OK: DTC is not output. 

NG: GO TO CAN COMMUNICATION SYSTEM  (See DIAGNOSTIC TROUBLE CODE CHART )

OK: Go to next step 

1. Select the Active Test using the Techstream to generate a control command, and then check that the rear window defogger operates.

   Air Conditioner 

   AIR CONDITIONER REFERENCE
   
   

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

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   Rear window defogger operates normally (w/ Navigation System)	A
   Rear window defogger operates normally (w/o Navigation System)	B
   Rear window defogger does not operate	C

B:  Go to step  5

C:  Go to step  7

A: Go to next step 

1. Temporarily replace the display and navigation module display with a new or normally functioning one (See REMOVAL ).

1. Turn the engine switch on (IG).
2. Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.
3. Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.

   OK: Rear window defogger system functioning normally. 

NG: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

OK: END 

1. Temporarily replace the multi-display with a new or normally functioning one (See REMOVAL ).

1. Turn the engine switch on (IG).
2. Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.
3. Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.

   OK: Rear window defogger system functioning normally. 

NG: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

OK: END 

1. Remove the DEFOG H-fuse from the engine room relay block.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   DEFOG H-fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to next step 

1. Remove the defogger relay from the engine room relay block.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   3 - 4	Battery voltage is not applied to terminals 1 and 2	Below 1 Ω
   3 - 5		10 kΩ or higher
   3 - 4	Battery voltage is applied to terminals 1 and 2	10 kΩ or higher
   3 - 5		Below 1 Ω

   Fig 1: Identifying Engine Room Relay Block Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE DEFOGGER RELAY 

OK: Go to next step 

1. Remove the defogger relay from the engine room relay block.
2. Disconnect the E36 air conditioning amplifier connector.
3. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   Defogger relay terminal 1 - Body ground	Engine switch on (IG)	11 to 14 V
   Defogger relay terminal 5 - Body ground	Always	11 to 14 V

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

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   Defogger relay terminal 2 - E36-24 (RDEF)	Always	Below 1 Ω
   Defogger relay terminal 2 - Body ground	Always	10 kΩ higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying E36 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect the S17 and S18 defogger connectors.
2. Remove the defogger relay from the engine room relay block.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   S17-1 (B) - Defogger relay terminal 3	Always	Below 1 Ω
   S18-1 (E) - Body ground
   Defogger relay terminal 4 - Body ground
   S17-1 (B) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying Engine Room Relay Block Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect the S17 and S18 defogger connector.
2. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   S17-1 (B) - S18-1 (E)	Engine switch on (IG) and defogger switch on	11 to 14 V

NG: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

Fig 4: Identifying S17 And S18 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE BACK WINDOW GLASS  (See REMOVAL  )