Mirror Heater does not Operate with Rear Defogger Switch: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical /Air Conditioner / Active Test.
5. Perform an Active Test according to the display on the Techstream.
   AIR CONDITIONER
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Mirror heater	ON / OFF	-

   Result

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

B → See step   5 

C → See step   6 

A: Go to next step 

1. Check rear window defogger operation.

   OK

   The rear window defogger operates normally.

NG → See step   10 

OK: Go to next step 

1. Disconnect the integration relay connector.
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1H-3 (GND2) - Body ground	Always	Below 1 Ω
   1G-22 (GND1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the integration relay connector.
2. Disconnect the outer rear view mirror assembly LH connector.
3. Disconnect the outer rear view mirror assembly RH connector.
4. Measure the resistance according to the value(s) in the table below

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1I-2 (MHTR) - N3-1 (HR+)	Always	Below 1 Ω
   1I-2 (MHTR) - O3-1 (HL+)	Always	Below 1 Ω
   1I-2 (MHTR) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7 

1. Disconnect the integration relay connector.
2. Disconnect the outer rear view mirror assembly LH connector.
3. Disconnect the outer rear view mirror assembly RH connector.
4. Measure the resistance according to the value(s) in the table below

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1I-2 (MHTR) - N3-1 (HR+)	Always	Below 1 Ω
   1I-2 (MHTR) - Body ground	Always	10 kΩ or higher
   N3-2 (HR-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

1. Disconnect the integration relay connector.
2. Disconnect the outer rear view mirror assembly LH connector.
3. Disconnect the outer rear view mirror assembly RH connector.
4. Measure the resistance according to the value(s) in the table below

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1I-2 (MHTR) - O3-1 (HL+)	Always	Below 1 Ω
   1I-2 (MHTR) - Body ground	Always	10 kΩ or higher
   O3-2 (HL-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9