Mirror Heater Does Not Operate With Rear Defogger Switch

MIRROR: POWER MIRROR CONTROL SYSTEM: Mirror Heater does not Operate with Rear Defogger Switch

Mirror Heater does not Operate with Rear Defogger Switch

SYSTEM DESCRIPTION

The mirror heater operates when the following conditions are met: 1) the air conditioning amplifier sends a rear defogger switch signal through the CAN (can communication) line to the front door ECU LH and RH, and 2) the defogger operates.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC
(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. CHECK DEFOGGER SYSTEM
(a) Check that the defogger operates normally.
OK:
Defogger operates normally.
NG -- GO TO WINDOW DEFOGGER SYSTEM
OK -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM (MIRROR HEATER FUNCTION) Scan Tool Testing and Procedures
(a) Select the Active Test, use the Techstream to generate a control command, and then check the mirror heater function.

Driver Door





Passenger Door





Result (Driver Side):





Result (Passenger Side):





D -- REPLACE AIR CONDITIONING AMPLIFIER
C -- INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH
B -- REPLACE AIR CONDITIONING AMPLIFIER
A -- Continue to next step.

4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH




(a) Remove the mirror LH Removal.
(b) Check the operation of the mirror heater.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:






(2) Apply battery voltage and check the mirror heater operation.
OK:





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

NG -- REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH
OK -- REPLACE FRONT DOOR ECU LH
5. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH




(a) Remove the mirror RH Removal.
(b) Check the operation of the mirror heater.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:






(2) Apply battery voltage and check the mirror heater operation.
OK:





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

NG -- REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH
OK -- REPLACE FRONT DOOR ECU RH