Anytime I use the rear defroster it causes the other fuse to pop?

SPOHNCONNOR

MEMBER
2018 NISSAN ALTIMA
4 CYL
2WD
AUTOMATIC
138,000 MILES

I realized 3 days ago that a fuse went out, if you look at the Nissan diagram it would be fuse 30. I replaced it and my compass, and A/C work now. Today it went out again, I got a circuit tester and I put in a new fuse, and it worked but the slots 22, 23, 24 are not getting any light or power when I hit it with the tester. Anytime I use the rear defroster it causes the other fuse to pop and the a/c not to work. How can I fix?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,968 POSTS

The fact that it pops fuse #30 points to the rear window control relay. I would swap it out to see what happens, here is the location for the relay (#5) and the wiring diagrams for the system so you can see how it works. Check out the images (below). Please let us know how it goes.

Images (Click to make bigger)

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Thursday, October 5th, 2023 AT 8:33 AM

SPOHNCONNOR

MEMBER
2 POSTS

Ken, I realized today, that I started the car after putting a new one in, after I did so. It blew by just starting the car.

Was this

answer

helpful?

Yes

No

Thursday, October 5th, 2023 AT 8:49 AM

KEN L

MASTER CERTIFIED MECHANIC
42,968 POSTS

I assume you replaced the relay and the #30 fuse blew? If so do me a favor and unplug the A/C compressor and try a new fuse once again. Let me know. Also, is the rear defroster on when the fuse blows.

Was this

answer

helpful?

Yes

No

Friday, October 6th, 2023 AT 9:23 AM