Inspection Procedure

1. Check that the defogger operates normally (see DATA LIST / ACTIVE TEST ).

   OK: Defogger operates normally. 

NG:  GO TO WINDOW DEFOGGER SYSTEM (See PROBLEM SYMPTOMS TABLE )

OK: GO TO Next Step 

1. Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check the mirror heater function.

   Front multiplex network door ECU (LH, RH): 

   ACTIVE TEST
   
   

   Item	Test Details
   MIRR HEATER	Mirror heater operation OFF / ON

   Result (Front multiplex network door ECU LH): 

   RESULT REFERENCE
   
   

   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 REFERENCE
   
   

   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 

      MEASUREMENT CONDITION AND SPECIFIED CONDITION
      
      

      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 

      MEASUREMENT CONDITION AND SPECIFIED CONDITION
      
      

      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