Mirror Heater does not Operate with Rear Defogger Switch: Procedure

1. Check if a CAN communication DTC is output. Refer to DIAGNOSIS SYSTEM .
   RESULT
   
   

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

B → See step   6 

A: Go to next step 

1. Check window defogger system operation. Refer to SYSTEM DESCRIPTION .

   OK

   Window defogger system is normal.

NG → See step   7 

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. Refer to DATA LIST / ACTIVE TEST .
   MIRROR L / MIRROR R
   
   

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

   OK

   Mirror heater operates normally.

   RESULT
   
   

   Result	Proceed to
   Mirror heater operation of both mirrors is normal	A
   Mirror heater operation of LH side mirror is not normal	B
   Mirror heater operation of RH side mirror is not normal	C

C → See step   5 

B → See step   4 

A → See step   8 

1. Remove the outer rear view mirror assembly LH. Refer to REMOVAL .
   Fig 1: Identifying z3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z3-4 (HTR+) - z3-12 (HTR-)	25 °C (77 °F)	2.4 to 4.4 Ω

NG → See step   10 

OK → See step   9 

1. Remove the outer rear view mirror assembly RH. Refer to REMOVAL .
   Fig 2: Identifying z2 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z2-4 (HTR+) - z2-12 (HTR-)	25 °C (77 °F)	2.4 to 4.4 Ω

NG → See step   12 

OK → See step   11