Windshield Deicer does not Operate [09/2015 - ]: Procedure

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

   Tester Display	Test Part	Control Range	Diagnostic Note
   Deicer Relay (Front)	DEICER relay operation	OFF / ON	-

   OK

   Windshield deicer operates normally

Result:  NG

NG 

See step  5

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 

See step  4

1. Temporarily replace the multi-media module receiver assembly 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 (MULTI-MEDIA MODULE RECEIVER IS DEFECTIVE) 

Result:  NG

NG 

REPLACE ACCESSORY METER 

(Refer to REMOVAL [09/2015 - ] )

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard resistance

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

Result:  NG

NG 

REPLACE DEICER RELAY 

Result:  OK

OK 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the DEICER 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
   DEICER relay terminal 1 - Body ground	Always	11 to 14 V
   DEICER 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
   DEICER relay terminal 2 - A51-13 (FDEF)	Always	Below 1 Ω
   DEICER relay terminal 2 - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  7

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the DEICER relay from the No. 3 relay block.
2. Disconnect the A30 windshield glass connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A30-1 (B2) - DEICER relay terminal 3	Always	Below 1 Ω
   A30-2 (B) - DEICER relay terminal 3	Always	Below 1 Ω
   A30-3 (E) - Body ground	Always	Below 1 Ω
   DEICER relay terminal 3 - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  8

1. Check the windshield glass (Refer to ON-VEHICLE INSPECTION [09/2015 - ] ).
2. Check that the malfunction disappears.

   OK

   Malfunction disappears.

Result:  NG

NG 

REPLACE WINDSHIELD GLASS 

(Refer to REMOVAL [09/2015 - ] )

Result:  OK

OK 

See step  9

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 - ] )