Mazda CX-5 Service & Repair Manual: Rear Window Defroster/Outer Mirror Heater

Outline

• Fogging is cleared from the rear window and outer mirror glass by heating of the filament.

Structural view

System wiring diagram

Vehicles with full-auto air conditioner system

Vehicles with manual air conditioner system

Construction

Rear window defroster

• The rear window defroster filament is inside the rear window glass.

  

  
  

Heated outer mirror

• The heated outer mirror filament is integrated in the outer mirror glass.

  

  
  

Operation

Vehicles with full-auto air conditioner system

1. When the rear window defroster switch on the climate control unit is turned on (1), an ON/OFF control request signal is sent to the front body control module (FBCM) through the instrument cluster as a CAN signal.(2)

2. When the front body control module (FBCM) receives the ON/OFF control request signal, it supplies the battery voltage to the rear window defroster relay.(3)

3. When the battery voltage is supplied to the rear window defroster relay, a switch inside the rear window defroster relay is turned on.(4)

4. When the switch inside the rear window defroster relay is turned on, the battery voltage is supplied to the rear window defroster/heated outer mirrors to operate them.(5)

• When approx. 15 min.

  has elapsed after the rear window defroster switch was turned on, the timer control of the front body control module (FBCM) turns off the rear window defroster relay automatically to turn off the rear window defroster/heated outer mirror.

• When the rear window defroster switch is pressed while the rear window defroster/heated outer mirrors are operating, they stop operating.

Vehicles with manual air conditioner system

1. When the rear window defroster switch on the climate control unit is turned on (1), a signal is sent from the climate control unit to the front body control module (FBCM) and the battery voltage is supplied to the rear window defroster relay.(2)

2. When the battery voltage is supplied to the rear window defroster relay, a switch inside the rear window defroster relay is turned on.(3)

3. When the switch inside the rear window defroster relay is turned on, the battery voltage is supplied to the rear window defroster/heated outer mirrors to operate them.(4)

• When approx. 15 min.

  has elapsed after the rear window defroster switch was turned on, the timer control of the front body control module (FBCM) turns off the rear window defroster relay automatically to turn off the rear window defroster/heated outer mirror.

• When the rear window defroster switch is pressed while the rear window defroster/heated outer mirrors are operating, they stop operating.

Fail-safe

• Function not equipped