Mirror Heater does not Operate with Rear Defogger Switch: Procedure

1. Use the Techstream to check if the CAN communication system is functioning normally.
   RESULT:
   
   

   Result	Proceed to
   CAN DTC is not output	A
   CAN DTC is output	B

B → See step   8 

A: Go to next step 

1. Check that the defogger operates normally.

   OK

   Defogger operates normally.

NG → See step   9 

OK: Go to next step 

1. Select the Active Test, use the Techstream to generate a control command, and then check the mirror heater function.
   DRIVER DOOR
   
   

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

   PASSENGER DOOR
   
   

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

   RESULT (DRIVER SIDE):
   
   

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

   RESULT (PASSENGER SIDE):
   
   

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

D → See step   12 

C → See step   6 

B → See step   12 

A: Go to next step 

Fig 1: Inspecting Outer Rear View Mirror Assembly LH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the mirror LH. Refer to REMOVAL .
2. Check the operation of the mirror heater.
   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      4 (HTR+) - 12 (LP-)	25°C (75°F)	3.0 to 4.0 Ω

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

      OK

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

      HINT: 

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

NG → See step   10 

OK → See step   5 

Fig 2: Inspecting Outer Rear View Mirror Assembly RH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the mirror RH. Refer to REMOVAL .
2. Check the operation of the mirror heater.
   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      4 (HTR+) - 12 (LP-)	25°C (75°F)	3.0 to 4.0 Ω

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

      OK

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

      HINT: 

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

NG → See step   11 

OK → See step   7