Inspection Procedure

1. Check that the defogger operates normally (see ON-VEHICLE INSPECTION ).

   OK: Defogger operates normally. 

NG: Go to WINDOW DEFOGGER SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: Go to Next Step 

1. Select the ACTIVE TEST, use Techstream a control command, and then check the mirror heater function.

   Front multiplex network door ECU (LH, RH): 

   FRONT MULTIPLEX NETWORK DOOR ECU (LH, RH) ACTIVE TEST REFERENCE
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Mirror Heater	Mirror heater operation	OFF / ON	-

   Result (Front multiplex network door ECU LH): 

   RESULT CHART
   
   

   Result	Proceed to
   Outer rear view mirror LH does not operate normally	A
   Outer rear view mirror LH operates normally	B

   Result (Front multiplex network door ECU RH): 

   RESULT CHART
   
   

   Result	Proceed to
   Outer rear view mirror RH does not operate normally	C
   Outer rear view mirror RH operates normally	D

B:  Go to step  5

C:  Go to step  4

D:  Go to step  6

A: Go to Next Step 

1. Remove the mirror LH.
2. Check the operation of the mirror heater.
   1. Measure the resistance between terminals 4 and 12 of the connector.

      Standard resistance: 3.6 to 4.8 Ω at 25°C (75°F) 

   2. Apply battery voltage and check the mirror heater operation.

      OK 

      RESISTANCE SPECIFICATION
      
      

      Measurement Condition	Specified Condition
      Battery positive (+) → Terminal 4 (+) Battery negative (-) → Terminal 12 (-)	Mirror becomes warm

      HINT:

      It will take a short time for the mirror to become warm.

   Fig 1: Inspecting Outer Rear View Mirror Assembly LH (Mirror Heater)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH  (See REMOVAL  )

OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH 

1. Remove the mirror RH.
2. Check the operation of the mirror heater.
   1. Measure the resistance between terminals 4 and 12 of the connector.

      Standard resistance: 3.6 to 4.8 Ω at 25°C (75°F) 

   2. Apply battery voltage and check the mirror heater operation.

      OK 

      RESISTANCE SPECIFICATION
      
      

      Measurement Condition	Specified Condition
      Battery positive (+) → Terminal 4 (+) Battery negative (-) → Terminal 12 (-)	Mirror becomes warm

      HINT:

      It will take a short time for the mirror to become warm.

   Fig 2: Inspecting Outer Rear View Mirror Assembly RH (Mirror Heater)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH  (See REMOVAL  )

OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH 

1. Check if the malfunction disappears when a normally functioning front multiplex network door ECU LH is installed.

   OK: Mirror heater operates normally. 

NG: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY  (See REMOVAL )

OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH 

1. Check if the malfunction disappears when a normally functioning front multiplex network door ECU RH is installed.

   OK: Mirror heater operates normally. 

NG: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY  (See REMOVAL )

OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH