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Angry 944 horn troubles.

I have an interesting question about the 944 horn system. The PO of my 944 said he unhooked something to get the horn to stop blaring intermittantly. Well, I think I have that problem figured out (steering wheel ground wire chafed against metal, duh.) He didn't unhook the horn pad wire, and he didn't unhook the horn itself. Looking at Bill Underwood's fuse panel diagram, it says Horn Relay (16A Fuse). My relay looks like a metal box with two tabs coming off of the top. These tabs are hot when the horn is depressed. I am hesitant to just short them, or even put a fuse there and see what happens. Are these two tabs for the abovementioned 16A fuse, and if so, where would I get one? Sorry if this is answered in the Haynes manual, but mine is still coming.

Thanks ahead of time.
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I am blessed/cursed with these cars:

BMW 318iS 1991
BMW 325iS 1988
Volvo 740 Turbo Wagon 1992

Quote of the week:

"This chemical is known to cause Birth Defects in California."

Poor Californians, they are always getting the short end of it, and now this?
Old 12-13-2002, 09:26 AM
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I too have been messing with my horn. I just got a new horn relay from Pelican. I think the horn relay is the black one to the left of the metal one. At least the replacement one I got is small black plastic one, not a metal one with the tabs that you're looking at. Me thinks that the metal one might be wiper relay?

Take this for what it worth from a guy who still hasn't got his honking
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1984 944 -- Silver
1984 944 -- Red

2002 Nissan Frontier 4 Door Truck
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Old 12-13-2002, 06:30 PM
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My car had the fused relay and the po took out the horn relay, I replaced horn relay, so I don't think that's the one that's supposed to be there. But, by all means, put in a 16a or lower fuse, and see if it works. Of course pelican sells fuses, and I imagine you could get what you're looking for there. I bought an asst. of fuses and keep em in the car.
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 12-14-2002, 01:22 AM
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Talking It worked!!!

I pulled the 16A fuse from the #5 not connected bank assuming it is a spare, and put it in the relay. It fit, and the horn went off correctly!!!!

For the gentleman whose horn still doesn't work, possible problems are:

1). There is no power to pin 30 of the relay. This is bad. It means that no power can be going to the horn. The high amperage current to the horn (>10A) is passed from pin 30 to pin 87, with the relay acting as a switch between the two.

2). Pin 87 does not connect any longer to the horn. Either it is open, or it is grounded. Neither is good. Look along the length of the wire to check for opens and grounds.

3) The second lead from the horn no longer goes to ground. This hooks up near the left headlight to chassis ground, and isn't too hard to check.

4) Does the relay "click" when you press the horn button? If not, then the power isn't going to it properly. One pin of the relay is low voltage hot (+12V) and is either 85 or 86. This pin should be hot when the car is on. The other pin, again either 85 or 86, goes to the horn button, which then grounds out the circuit.

5) You might want to check the horn unit itself. You just take it out and hook up a fused set of leads to it and the battery. If it goes off, you are looking good.

Have Fun!!!!!!
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I am blessed/cursed with these cars:

BMW 318iS 1991
BMW 325iS 1988
Volvo 740 Turbo Wagon 1992

Quote of the week:

"This chemical is known to cause Birth Defects in California."

Poor Californians, they are always getting the short end of it, and now this?
Old 12-14-2002, 06:28 AM
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Honestly, I think that's the wrong relay for the horn, then. I wouldn't think it matters, but if you wanted the correct relay, Pelican sells them (Why, yes, I did apply for an affiliateship, why do you ask?)
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 12-14-2002, 06:57 AM
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horn

Well I tried the 16amp fuse on the relay. No luck. But I had been wondering about those two spade terminal looking things on that relay. None of the stuff I have says anything about a fuse going in there. Glad to know what they're for!! But I still wonder about the new relay I got (from Pelican #141-951-253B), it doesn't have those tabs, so is it the right relay?, should I swap it out anyway (I tried it in there and it still didn't honk)

I might just have to beat santa to the punch and go buy a multimeter. Got to get the honker working for inspection this month.

Gonna get out there today and jumper the horns to the batt. to see if they even work.

Thanks again & glad you got yours working.
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1984 944 -- Silver
1984 944 -- Red

2002 Nissan Frontier 4 Door Truck
"Porsche parts retrievel vehicle"

Last edited by goingboeing737; 12-14-2002 at 07:03 AM..
Old 12-14-2002, 07:01 AM
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I guess new ones don't have the fuse (kinda defeats the purpose of having a relay, I thought). Jumper is a good way to cut out the middle man. Odd thing: When I put my relay in, nothing worked, and then I jumped the horns, and they began to work. Like they needed a jumpstart or somthing.

I find my multimeter invaluable. Get one that has RPM/Dwell cycle.

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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 12-14-2002, 07:15 AM
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Don't forget the fuse!

If you are going to just jumper leads 30 and 87 or straight to the battery to check if the horn works, make sure you use a fuse. If you don't, and 87 is shorted to ground... You could have a fire that goes from the fuse box all of the way through the engine compartment. My repair book lists that as "bad." A good way of doing this is to get a radio fuse holder with the two wires sticking out of each end, and just use it that way. I would unhook the battery from the car, too.

I think todwic is right on the older ones having the fuse, and the newer ones not. I personally like having the fuse.

A multimeter is wayyy helpful any time you really own a car instead of just possessing it. My personal preference is a Fluke, and along those lines I have a model 87.
__________________
I am blessed/cursed with these cars:

BMW 318iS 1991
BMW 325iS 1988
Volvo 740 Turbo Wagon 1992

Quote of the week:

"This chemical is known to cause Birth Defects in California."

Poor Californians, they are always getting the short end of it, and now this?
Old 12-14-2002, 07:37 AM
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FINALLY A HORNY PORSCHE

Praise the Lord and pass the amunition.... My darn horn WORKS. Not much changed, I took out the battery to put in a battery mat and I put on new plug wires and VILOA horn honks. Whatever..

Also being lazy AND stupid I will now go get new plugs...Duh.. The wires alone will allow me to keep my fillings (teeth) intact, feels like I put in new motor mounts. Reduced engine vibration at startup about 90%. WOW.

Thanks for your good thoughts to the horn God, now I can move on to posts about my next item.....shifter bushing.
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1984 944 -- Silver
1984 944 -- Red

2002 Nissan Frontier 4 Door Truck
"Porsche parts retrievel vehicle"
Old 12-14-2002, 08:37 AM
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My horn works once in a while if I hit the horn pad a bunch. But it rarely works, any ideas before I dig in?
Thanks,
Ryan
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PORSCHE: NOTHING EVEN COMES CLOSE

Early 85 G-red 944na, S2 transmission, Ice Shark grounds, Cibie E-Code lights, turbo rear valance, 924S gauges, Turbo S full power seats, "Porsche" door handles, Enkei Wheels.
95 Infiniti G20 dark red metallic-for sale soon
87 BMW 325ic Bronzit, stock(for now)
Old 12-14-2002, 09:24 AM
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Your problem may be as simple as cleaning the contacts on the horn pad on the steering wheel.
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Old 12-14-2002, 09:59 AM
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I will go with Trevor, there.

It probably is something simple. Have you ever pulled the horn pad off and looked? It could definately be contacts in that section, or the wires being loose.

The biggest thing in troubleshooting the horn is to separate it into it's two sections: Relay side, and horn side.

Does the relay click when you hit the horn button, even if it doesn't go off? If so, then relay side is fine.

Also, no matter what happens, the relay there could be bad.
__________________
I am blessed/cursed with these cars:

BMW 318iS 1991
BMW 325iS 1988
Volvo 740 Turbo Wagon 1992

Quote of the week:

"This chemical is known to cause Birth Defects in California."

Poor Californians, they are always getting the short end of it, and now this?
Old 12-14-2002, 10:10 AM
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I suck, I don't even know where my fuse panel is.. (haven't looked) I need to replace a few.. Umm.. a little help?..


Frank B
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Old 12-14-2002, 10:25 PM
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driver's side footwell. this is my third post, the other two were HI-larious, but I've lost my sense of humor. Send me an email to this address and I'll send you the zip file I've prepared for you.
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 12-15-2002, 12:08 AM
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Frank's got an 86, I think the later models have the fuse panels under the hood on the drivers side close to the windshield, mine is an early car and it's in the drivers side footwell.
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PORSCHE: NOTHING EVEN COMES CLOSE

Early 85 G-red 944na, S2 transmission, Ice Shark grounds, Cibie E-Code lights, turbo rear valance, 924S gauges, Turbo S full power seats, "Porsche" door handles, Enkei Wheels.
95 Infiniti G20 dark red metallic-for sale soon
87 BMW 325ic Bronzit, stock(for now)
Old 12-15-2002, 11:05 AM
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1988 944 horn troubles

Can anyone help me with this?

What is the deal with my horn constantly sounding? When I bought the car the horn did not work, so I check the fuses and found out that the horns fuse was blown. I replaced the fuse then immediately I had to remove removed it, because the horn began constantly blowing (this freaked me out to say the least).

I pryed the horn pad from the steering column to take a look and all looked well. I unattached the black wire from the pad then reinstalled the fuse. To my surprise the horn still constantly sounds and won't shut up. What should I do next. It's a nice little 1988 and serious fun to drive.


Thanks
Old 12-21-2002, 08:44 AM
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I'd tap the actual horn with a hammer. I'm not joking.
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Old 12-21-2002, 09:26 AM
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Old 12-21-2002, 09:26 AM
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