Nissan Sentra B18 (2020-2025) Service Manual: Defogger System

Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Defogger :: System Description / Component Parts / Defogger System

Component Parts Location

Component Parts Location

A/C switch assembly

(view with component removed)

View of fuse block (J/B) removed

No.	Component	Function
1.	Rear window defogger	Refer to Rear Window Defogger.
2.	Door mirror RH (if equipped)	Refer to Door Mirror Defogger.
3.	A/C Amp. (with manual A/C) A/C Auto Amp. (with automatic A/C)	A/C Amp. or A/C Auto Amp. transmits rear window defogger switch signal to BCM via CAN communication. Display control unit transmits rear window defogger feedback signal to A/C switch assembly. Refer to Component Description (with Automatic A/C), or Component Description (with Manual A/C) for detailed component location.
4.	BCM (Body Control Module)	Receives rear window defogger switch signal. Performs the timer control of rear window defogger. Refer to Component Parts Location for detailed component location.
5.	Door mirror LH (if equipped)	Refer to Door Mirror Defogger.
6.	Rear window defogger condenser	Reduces the electrical noise of rear window defogger operation.
7.	A/C switch assembly (with automatic A/C) (Rear window defogger switch)	Rear window defogger switch is integrated into the switch assembly. Turns the indicator lamp ON when detecting the operation of rear window defogger. Refer to Component Description for detailed component location.
8.	A/C switch assembly (with manual A/C) (Rear window defogger switch)	Rear window defogger switch is integrated into the switch assembly. Turns the indicator lamp ON when detecting the operation of rear window defogger. Refer to Component Description for detailed component location.
9.	Rear window defogger relay	Operates the rear window defogger and door mirror defogger (if equipped) with the control signal from BCM.

Door Mirror Defogger

Door Mirror Defogger

Door mirror defogger are installed in door mirror glass.
When the rear window defogger switch is turned ON, current flows to the mirror defogger, heating the heat wires.
Electricity flows to the heat wire (mirror defogger) contained inside the glass mirror, and the glass mirror is heated to eliminated the fogging.

Rear Window Defogger

Rear Window Defogger

The rear window defogger is installed onto the rear window glass.
When the rear window defogger switch is turned ON, current flows to the rear window defogger, heating the heat wires.
Electricity flows to the heat wire (rear window defogger) contained inside the back door window glass, and the back door window glass is heated to eliminated the fogging.

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