Rear Window Defogger System does not Operate [09/2015 - ]: Procedure

1. Select the Active Test, using the Techstream to generate a control command, and then check that the rear window defogger operates (Refer to DATA LIST / ACTIVE TEST [09/2015 - ] ).
   AIR CONDITIONER
   
   

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

   OK

   Rear window defogger operates normally

Result:  NG

NG 

See step  4

Result:  OK

OK 

See step  2

1. Temporarily replace the multiplex network front light ECU (front controller) with a new or normally functioning one.
2. Check that the malfunction disappears.

   OK

   Malfunction disappears.

Result:  OK

OK 

END (MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] IS DEFECTIVE) 

Result:  NG

NG 

See step  3

1. Temporarily replace the air conditioning amplifier with a new or normally functioning one (Refer to REMOVAL [09/2015 - ] ).
2. Check that the malfunction disappears.

   OK

   Malfunction disappears.

Result:  OK

OK 

END (AIR CONDITIONING AMPLIFIER IS DEFECTIVE) 

Result:  NG

NG 

REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY 

(Refer to REMOVAL [09/2015 - ] )

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the DEFOG relay from the relay block No. 3.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

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

Result:  NG

NG 

REPLACE DEFOG RELAY 

Result:  OK

OK 

See step  5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the DEFOG relay from the No. 3 relay block.
2. Disconnect the A51 multiplex network front light ECU (front controller) connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   DEFOG relay terminal 2 - Body ground	Power switch on (IG)	11 to 14 V
   DEFOG 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

   Tester Connection	Condition	Specified Condition
   DEFOG relay terminal 1 - A51-12 (RDEF)	Always	Below 1 Ω
   DEFOG relay terminal 1 - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the S19 and W1 back window glass connectors.
2. Disconnect the DEFOG relay from the No. 3 relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   S19-1 - DEFOG relay terminal 3	Always	Below 1 Ω
   W1-1 - Body ground	Always	Below 1 Ω
   DEFOG relay terminal 4 - Body ground	Always	Below 1 Ω
   S19-1 - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  7

1. Check the rear window defogger (Refer to ON-VEHICLE INSPECTION [09/2015 - ] ).
   RESULT
   
   

   Result	Proceed to
   Rear window defogger is broken	A
   Rear window defogger is not broken	B

Result:  A

A 

REPAIR OR REPLACE REAR WINDOW DEFOGGER 

(Refer to REPAIR [09/2015 - ] )

Result:  B

B 

See step  8

1. Temporarily replace the multiplex network front light ECU (front controller) with a new or normally functioning one.
2. Check that the malfunction disappears.

   OK

   Malfunction disappears.

Result:  OK

OK 

END (MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] IS DEFECTIVE) 

Result:  NG

NG 

REPLACE AIR CONDITIONING AMPLIFIER 

(Refer to REMOVAL [09/2015 - ] )