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Old 01-15-2011, 01:41 PM   #1
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Default '91 Civic rear defrost and horn not working

Hey guys, I just purchased a '91 civic hatch with 276000KM's on it and I love the car, although there are a couple of minor issues.

First off the rear defrost does not work, when I push the button, it does not light up and the rear window does not defrost. I checked the #18 10A fuse and it's fine as are the connections at the grid itself. Is there a relay in between there somewhere that I should check or anything like that? The horn is also inop. as well....

It's -25 celcius here right now and the temp gauge never quite reaches half, and if im in stop and go traffic, it starts to drop and the heater is never "burn you hot" like my buddies 1990 civic used to be, is this just an inherent issue with these cars or does it appear that my thermostat is leaking?

Any advice would be great, thanks a lot guys!
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Old 01-15-2011, 02:01 PM   #2
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Default Re: '91 Civic rear defrost and horn not working

maybe your thermostat is stuck open or totally removed. id check that first. also try using a known working defrost switch from another car. if that works and still no defrost then your leads going across the back glass arent creating a circuit. the copper gets old and crispy after years of sun damage, or comes off from window tint being removed.
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I bet he was like the hood bra is 1500 and you get a car with the bra,hahaha
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Old 01-15-2011, 05:44 PM   #3
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Default Re: '91 Civic rear defrost and horn not working

theres a defroster relay on the fuse box and for the horns check in the engine bay fuse box and theres a fuse labeled horn
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Old 01-15-2011, 09:17 PM   #4
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Default Re: '91 Civic rear defrost and horn not working

Cool thanks guys, I just checked all my fuses and the connections at the defrost grid all seem OK. I'll try a different switch on monday and see if that fixes it.

Also, sometimes when I come to a stop the revs kinda dip down pretty low and nearly stalls, and it bogs when applying moderate throttle when it's cold, just some inherent issues with the TBI injection I'm assuming?
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Old 01-15-2011, 09:19 PM   #5
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Default Re: '91 Civic rear defrost and horn not working

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theres a defroster relay on the fuse box and for the horns check in the engine bay fuse box and theres a fuse labeled horn
In the inerior fuse box or engine fuse box for the defrost? Theres both a fuse in the interior and engine fuse box labelled "defrost" but both were good, didn't see a relay though.
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Old 01-15-2011, 09:43 PM   #6
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Default Re: '91 Civic rear defrost and horn not working

theres a relay on the interior fuse box. Click the image to open in full size.
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Old 01-16-2011, 10:15 AM   #7
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Default Re: '91 Civic rear defrost and horn not working

Thanks for the info man, I really appreciate it. I went to pick 'n pull today and got a new switch, and the defrost works now. So in my case the light would not come on, and a new swtich fixed the issue, thanks again.

Any advice on the intermittent low idle and wanting to stall/bogging when acclerating issue?
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Old 01-16-2011, 10:19 AM   #8
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Default Re: '91 Civic rear defrost and horn not working

so it was the switch not the relay?
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Old 01-16-2011, 11:42 AM   #9
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Default Re: '91 Civic rear defrost and horn not working

Yup the switch fixed it
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Old 01-16-2011, 01:27 PM   #10
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Default Re: '91 Civic rear defrost and horn not working

then I cant take the credit for that fix aha
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Old 01-16-2011, 02:39 PM   #11
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Default Re: '91 Civic rear defrost and horn not working

Started a new thread for the bogging issue as I just found I had a code 7 - throttle angle. Any idea how to remove the TPS? I can't make out what kind of castanets are holding it on.
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Old 01-20-2011, 09:05 PM   #12
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Default Re: '91 Civic rear defrost and horn not working

haha nice man
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Old 01-20-2011, 09:07 PM   #13
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Default Re: '91 Civic rear defrost and horn not working

get another throttle body
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I bet he was like the hood bra is 1500 and you get a car with the bra,hahaha
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Old 01-21-2011, 11:33 AM   #14
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Default Re: '91 Civic rear defrost and horn not working

if u need a new dpfi throttle body I have one for sale
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Old 01-21-2011, 01:20 PM   #15
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Default Re: '91 Civic rear defrost and horn not working

Got the bolts out with a hammer and flat punch. Thanks though.
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