Rear window defogger relay located?

GUY_FROMMN

MEMBER
2006 HONDA CIVIC
80,000 MILES

My rear defogger doesn't work anymore. The light turns on when I push the button, but the defogger never warms up. My thinking is that the relay is possibly bad as I've checked the fuse and it is not blown. There are a bunch of relays under the hood in the fuse box except there is not a description of which one does what. If one of these relays is for the rear defogger and you can point out which one it is, I will be most grateful. I worry the dealership will charge a lot for testing etc. And a few bucks for a new relay is worth trying first. Also, it is a Civic Si if that makes any difference.

7 Replies

RIVERMIKERAT

MECHANIC
6,110 POSTS

Hello,

THe relay for the rear window defogger is under the hood in the relay center here is a guide to help you test it and the location of the relay in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

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Tuesday, November 29th, 2011 AT 8:43 PM

ALTERP

MEMBER
1 POST
2001 HONDA CIVIC

Electrical problem4 cyl Front Wheel Drive Automatic 99068 miles

Hello

My rear window defogger quit working. Grid is in good shape, no nicks etc. All wires attached. 40 amp fuse under hood fuse box replaced. Yellow indicator light works when rear defrost button pushed. What fuse is the proper fuse to check under dash. What else may be problem
Thanks

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Monday, October 8th, 2018 AT 5:24 PM (Merged)

KEN L

MASTER CERTIFIED MECHANIC
42,877 POSTS

Hello,

Fuse/relay box under hood, check fuse #11 30A and rear window defogger relay. Also check fuse box under the dash driver side fuse #14 10A.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

The is a relay that needs to be checked here is a guide to help you see whats wrong.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken

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Monday, October 8th, 2018 AT 5:24 PM (Merged)

CARTIERANDREA

MEMBER
1 POST
2005 HONDA CIVIC

Electrical problem
2005 Honda Civic 4 cyl Automatic 70000 miles

my rear defrost only works on the bottom half of the window. Can you help me

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Monday, October 8th, 2018 AT 5:24 PM (Merged)

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

You will need to repair the metal lines that you see running across the rear windshield. You can purchase rear defroster repair kits at most auto part stores or order than from sites such as ebay. Com. Its pretty simple to fix and relatively cheap.