Check Rear Window Defogger Signal

A/C and AV switch self-diagnosis is performed. Refer to "A/C AND AV SWITCH SELF-DIAGNOSIS FUNCTION "

Does rear window defogger switch light? 

Yes: GO TO  2.

No: Replace A/C and AV switch.

AV communication line check is performed. Refer to "UNABLE TO OPERATE SYSTEM WITH A/C AND AV SWITCH "

Is rear window defogger displayed on the display? 

Yes: GO TO  3.

No: Replace display control unit.

CAN communication line check is performed. Refer to "CAN COMMUNICATION CHECK ".

OK or NG 

OK: Check condition of harness and connector.

NG: In addition, it is necessary to check CAN communication line. Refer to "CAN COMMUNICATION CHECK ".