No Horn or Cruise Control

[ledzilla]

Quite a long time ago, both my horn and cruise control stopped working at the same time. I thought there was a problem with the clockspring, so I replaced it, but the problem persisted. The horn relay is still fine, as I was able to test that (and foolishly, too, it gave me quite a jump). The switches in the steering wheel all tested fine, as well. I eventually discovered that it appears that the horn and cruise control have power feed to them through the same wire coming up the steering column. However, I can't seem to find the wiring diagram that I was referencing to make that discovery. Would anyone be able to verify this information for me, or be able to point me to an accurate wiring diagram I can use? I figure what I have to do now is find that wire where it connects under the dash and maybe repair the connection from the harness to the clockspring. It would seem that there's a problem with the connector on the harness side.

[fastblackmerc]

Get a Ford factory wiring manual for a 2003 CV & GM (Marauder -specific stuff is included).

[tbone]

Replace the cruise control servo with a used one from ebay or yard. That solved my issues after the clockspring was necessarily replaced due to no buttons working at all. I had 2 servos. One worked, one did not. It controls more than just the cruise. The power feeds through it.

[ledzilla]

That would affect both the horn AND the cruise control? Huh. At least I know the climate control and radio buttons on the steering wheel still work just fine. But I wouldn't think that the power feed for the horn and cruise control would run from the servo under the hood.

[Turbov6Bryan]

Wow. Great find! Will have to remember than one

[tbone]

That would affect both the horn AND the cruise control? Huh. At least I know the climate control and radio buttons on the steering wheel still work just fine. But I wouldn't think that the power feed for the horn and cruise control would run from the servo under the hood.

After I replaced the clockspring and still had nothing, I was pretty dismayed. So I plugged in my spare servo and everything worked. Plugged the old one back in just to be sure, nothing.

Like I said, the power for all of it runs through the wiring that connects to the servo.

[ledzilla]

Well, I guess I ought to hit up one of the local boneyards to see what they have. I checked on eBay and I only found one, and they wanted $400+ for it.

[tbone]

I paid around $65. Twice. And another one for my Town Car. 3x

[tbone]

Here ya go.

http://www.ebay.com/itm/FORD-CROWN-VIC-CRUISE-CONTROL-SERVO-MODULE-2003-2004-OEM-3W7F-9C734-AA-VICTORIA-/201529087199?hash=item2eec11d4 df:g:ebsAAOSwwE5WbgG5&vxp=mtr

http://www.ebay.com/itm/GRAND-MARQUIS-MARAUDER-CRUISE-CONTROL-SERVO-MODULE-w-CABLE-2003-2004-3W7F-9C734-/301728226356?hash=item4640675c 34:g:Nu0AAOSw~gRV5LFR&vxp=mtr

Don't search "Marauder" unless you hate money.

Hurry and order it up or I may order it for a spare.

[Bruce Wayne]

my daily driver has the same issue, Thanks for this! I love this site

[ledzilla]

With free shipping, both certainly beat the $75 the local boneyard wants. I'm gonna have to check back once my paycheck comes in a few days. Buy one of these when I order those coil covers from Jerry.

[GoldPanther]

It seems that you have everything figured out, but just for the heck of it, have you check on the fuses yet? IIRC the horn and the cruise control share the same fuse but I can't remember if under the bash panel or under the hood's fuse panel. Just a thought.

[ledzilla]

Yeah, the fuses were the very first things I checked, not a single one was burned out.

[chief455]

I'm not saying this is the issue, but, when I poked my horn contact pad (changing the airbag emblem) - it stopped the horn and cruise from working. Because the horn circuit was fubar, the cruise said bye-bye.
I changed my entire airbag - everything worked again.
Seems a few things can kill the same items.

[ledzilla]

I did a continuity test with a multimeter on it, and pressing the horn switch indicated continuity. So not certain the problem is there.

[tbone]

Test it for power where the harness plugs in to the servo as well if not done already.

[Turbov6Bryan]

I did a continuity test with a multimeter on it, and pressing the horn switch indicated continuity. So not certain the problem is there.

Try it with everything plugged in, check the voltage

This isn't your issue, but say you have a 18 gauge wire and all the tiny strands of wires are separated/ cut except 1. Continuity will show good but there isn't enough copper to support the load.

Food for thought, you also need to check voltage flow :)

[ledzilla]

Considering there should always be power going to the horn switch, regardless if the car is running, except if the battery is dead, there should at least be power running to the horn switch. So, if there's no power, chances are that it could be the cruise control servo. If there is, maybe there's a wiring problem somewhere. Is that what you're getting at?

[tbone]

Did you order up the servo yet? I see that the ones on the link I gave you are sold.

[ledzilla]

Yeah, I ordered one of them. I just received notice of it shipping a few minutes ago. Should be getting it Thursday.

[tbone]

I was seriously thinking of ordering it. I'll get one on the next round. Let us know how it turns out.

[ledzilla]

One of them was already gone by the time I bought the other. I'm crossing my fingers that this solves the problem. I'm not fond of the idea of tracing the wiring to find the problem.

[tbone]

It will work.

[Lowndex]

After I replaced the clockspring and still had nothing, I was pretty dismayed. So I plugged in my spare servo and everything worked. Plugged the old one back in just to be sure, nothing.

Like I said, the power for all of it runs through the wiring that connects to the servo.

On the Ford parts site, I cannot find the clock spring p/n.

[tbone]

http://www.ebay.com/itm/2001-2005-Ford-Crown-Victoria-Grand-Marquis-Air-Bag-Clockspring-Contact-OEM-NEW-/321930075769?fits=Year%3A2003% 7CMake%3AMercury%7CModel%3AMar auder&hash=item4af4871e79:g:uhcAAOSw bdpWVMTz&vxp=mtr

You can find a better price. Look around.

[ledzilla]

Well, it arrived amazingly fast. Plugged it in, but still no horn. Haven't been able to get it out on the road to see if it affected the cruise control, though, but somehow I doubt I'll see a positive change in function.

[justbob]

I'm not fond of the idea of tracing the wiring to find the problem.


Get a test light and an alldatadiy account and be done with it. Sorry, but that's how it gets done.

Last Thursday I literally spent ten minutes combing through wiring diagrams on a 2009 F450 and about six minutes later I found a corroded wire for the fuel pump along the frame rail.

This truck was misdiagnosed in the field by one of our shop guys and towed into our shop at a cost of $400. After the TWO shop kids spent a few hours replacing the pump to find it still not starting I simply shook my head and dove in.

Now count up that waste for something that could have been diagnosed on the side of the road.




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[ledzilla]

Yeah, I know. Was really hoping it wasn't going to be necessary, but it looks like I gotta dig into it. Didn't really want to. At all.

[tbone]

Well, see if the cruise works at least. If you want to make sure you don't have another bad cruise module, find one that you know 100% that it is operable, like mine, before you drive yourself nuts. I'm not that far from you. Stop by.

[ledzilla]

Can't do that until after I have the hub assemblies replaced. Every opportunity I've had to be able to start seriously taking things apart has gotten goofed up because of the weather. It either rains (I have to move stuff out of the garage for sufficient work space, and the stuff I need to move shouldn't be left in the rain) or the temperature drops like a rock and it's too cold. I was hoping to be able to get somewhere with this stuff on Friday night and/or Saturday, but I hear the temperature is going to drop way down again by the weekend. Getting awfully sick of this weather this year. If I can get the work done, get the servo swapped out, and then drive and see that the cruise control still doesn't work, I'll sell the servo I bought to anyone who wants it, because obviously the servo wasn't an issue.

But I guess we'll see once I can get those buggered front hub assemblies replaced.

[tbone]

In the meantime you could also check to make sure relay 201 for the horn is working. Switch it with another existing one.

I'll buy the servo from you if indeed it is not the issue. Or at least confirm that you got one that works. It will take all of about 10-12 seconds to test and see if the horn works.

[ledzilla]

Well, I installed the servo last night and tested it out on a beer run. Still no cruise control. Also, the servo I bought is not a direct fit. It's designed to connect to a different throttle body. I had to secure it into place with a zip tie. It was my first time out with the JLT installed, though. It sounded so awesome to open the throttle.

Guess I'll be checking other stuff now, and I'll get the servo ready for sale.

[ledzilla]

Just to make clear, it did connect to the throttle body just fine, but the sheath had to be zip tied so it wouldn't move.

[tbone]

I would think it a possibility you got a bad servo. My offer stands to try mine. If the servo isn't the issue, I will buy it from you.

[ledzilla]

Yeah, I'll poke at a few more things this afternoon once I get back from having the rear cat delete done. I'll see about testing that relay, but I'm sure it's more of a wiring issue if both the cruise and horn are out. Want to get it fixed before Marauderville.

[justbob]

Yeah, I'll poke at a few more things this afternoon once I get back from having the rear cat delete done. I'll see about testing that relay, but I'm sure it's more of a wiring issue if both the cruise and horn are out. Want to get it fixed before LOUISVILLE .


Fixed.

Also, don't drink the koolaid and pay over $40 for the cats removed! That's all I payed at Velasquez and sons. They have many locations.



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[ledzilla]

I've seen them along Rte 31 in Aurora. I had it done plus some patching for a few issues I hadn't noticed before. All done for $100. Works for me considering I paid $65 last year just to have a flange cut out and pipe welded in on my Buick.

And I'd like to hit up Louisville, but I won't be able to make it.

[tbone]

Yeah, I'll poke at a few more things this afternoon once I get back from having the rear cat delete done. I'll see about testing that relay, but I'm sure it's more of a wiring issue if both the cruise and horn are out. Want to get it fixed before Marauderville.

I bought a modded FPDM from RacerX. Worked great until suddenly the fuel pump stopped coming on. Contacted Bill (RacerX) who advised me to swap out the horn relay (201) for the fuel pump relay (203) and it fixed the issue. So yeah, those relays do fail. Funny thing is the old fuel pump relay still operated the horn. I dunno.....

Even if the servo is ok I would advise hoarding the part. It will most likely fail at some point in the future... If $$ is an issue, I will certainly buy it from you.

[tbone]

Did you ever get this fixed?

[Bruce Wayne]

yeah , so does the horn and cruise work now, and if so, what was the issue? unless I missed something.. Thanks

[ledzilla]

No, not yet. The weather around Chicago has completely sucked, and when it hasn't I didn't have the time.

[tbone]

No, not yet. The weather around Chicago has completely sucked, and when it hasn't I didn't have the time.

I've been driving mine a lot. Haven't seen a salt truck in a long time. Anyway, looking forward to seeing the results.

[ledzilla]

Been seeing too much snow, rain, and cold out around Aurora on days I've had the time. Today, though, I was able to get started on fixing the front lights, but all I've really done is pull the lamps off so I could clean and polish them before adding the tinted Xpel film I ordered.

[ledzilla]

Ok, so I found the wiring diagram I've been looking for, but this isn't as clear as I had hoped. I thought I had found one before that was easier to read. Anyway, this points out that the horn and cruise control have the same wire. It looks like it should be dark blue going in and dark green/orange going out.

http://uploads.tapatalk-cdn.com/20160426/f62b9e80c53ce80b427256eb4554bb ed.jpg

[Bruce Wayne]

Does anyone know the correct Ford part # number for this servo module ?

[ledzilla]

Well, on Tasca it says the servo part number is 3W7Z-9C735-AA. Is that not the part number you're looking for?