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1999 Ford F350 Diesel cruse control doesn't work, light

Customer Question
doesnt come on....
1999 Ford F350 Diesel cruse control doesn't work, light doesnt come on.
Submitted: 1 year ago.Category: Ford
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Answered in 4 minutes by:
6/8/2016
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago
Juan Crespo
Juan Crespo, Tech Trainer
Category: Ford
Satisfied Customers: 1,526
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Hi there.

The most common cause of the cruise not working is a bad clock-spring connector. Is the Air Bag warning light on? Does the horn work from the pad on the steering wheel?

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Customer reply replied 1 year ago
with engine running, horn honks from the pad on the steering wheel, there is no air bag warning light on....
Customer reply replied 1 year ago
are we done?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

That's good to hear. Now we know the problem is somewhere else.

You might already know this, but Ford issued a recall for the speed control deactivation switch. Has that repair been done to your truck? If yes, then you'll need to remove the driver's air bag module so we can start testing the circuit from the switches. If you'd like, I could upload the circuit diagram so we could both follow it along.

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Customer reply replied 1 year ago
No, this has not been done. I've checked for recalls and one has not come up for the cruise control. Should I check with the dealer?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Yes, you should. The recall I was referring to is NHTSA's 09V399000 (Ford's 09S09) and pertains, among other vehicles, to all Ford and Super Duty trucks from 1999 to 2003 - you can click here to read the actual recall notice.

I'd be more than glad to continue our diagnosis if necessary after the recall concern has been addressed.

Best Regards.

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Customer reply replied 1 year ago
I went to the Ford dealership and they provided a print out for my VIN which showed no recall for my truck. What now?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Well then I guess that means your VIN was not included in the recall.

Regarding the diagnostic procedures, first thing to do would be to remove the driver's air bag squib from the steering wheel so we could then gain access to the wiring going to the cruise switches. Is that something you're comfortable doing and have the tools to do it with?

Also, how about that wiring diagram, would you like me to upload it so we can follow along, or would you rather work off my instructions?

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Customer reply replied 1 year ago
I would be comfortable removing the air bag from the steering wheel, although I have no idea what a squib is! I would appreciate a wiring diagram so that I could work along with you....maybe tomorrow? I have the necessary tools....
Customer reply replied 1 year ago
What are we looking for?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

OK. The squib is what houses and contains all the things that will inflate the air bag. The air bag will come out of the squib when activated.

You will need basic hand tools and a good multimeter. I have attached the diagram in case you'd like to take a preliminary look at it.

I'm usually online weekdays from 2 to 8PM. Look forward to working with you.

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Customer reply replied 1 year ago
I'll be ready for you!
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Great!

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Customer reply replied 1 year ago
O.K., I have both negative battery cables disconnected and the lower cowling removed. Are there any fuses that I need to remove or check before proceeding? Do I need to remove the ignition switch? What's next? I have removed the turning indicator stem and have printed the circuit you provided. My sleeves are rolled up and I have my screwdriver and my hammer!
Customer reply replied 1 year ago
Are you gonna answer or do I need to find someone else?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

My apologies. We just had a massive power outage.

Next step would be to use your meter to test continuity on the cruise switches, or, as I would prefer, you could leave the airbag squib out and re-connect the battery so we could test actual voltages at the switches. How about it?

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Customer reply replied 1 year ago
Okay dokay.....I've been out in the yard....104º here! Let me catch my breath! what time zone are you in?
Customer reply replied 1 year ago
Do I need to remove the ignition switch?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

It's the Caribbean, so they call it Atlantic Standard Time.

The only thing you need to remove for now is the airbag squib. With that out of the way, the switches and wiring should be accessible for testing.

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Customer reply replied 1 year ago
Got the airbag out with no disasters! Ready for the next steps!
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

OK. Turn the ignition switch on and check to see if there is voltage at the Dark Blue wire coming to the part of the switch that turns it ON and OFF (right side of the diagram - same circuit feeds the horn switch). If there is power there, turn CC on and check for power at the Light Blue/Black wire (left side of the diagram - circuit goes to the powertrain control module (PCM). Are those circuits OK?

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Customer reply replied 1 year ago
power on the right side....horn honks! No power on the left side...light blue wire, black stripe....on off control. I assume that this unit is bad, right? Or not...?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

You assume correctly, my dear sir (sorry I was just talking to my neighbor from the UK... )

It's actually quite common for these switches to fail after a few years. You can find new switches online for less than $100.

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Customer reply replied 1 year ago
Replaced both switches....still doesn't work.....what next?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

OK. Does that mean there's now power at the Light Blue/Black wire (left side of the diagram) with the cruise switch turned on and still the cruise won't work? If so, then there is more than just a bad switch and we need to keep testing.

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Customer reply replied 1 year ago
No power on the left side. Cruise does not come on.
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

The diagram shows power coming into the switch from the right side via the Dark Blue wire. When the switch is turned ON, the circuit closes and sends power through to the left side (Light Blue/Black wire). That means that either the replacement switch is not good or the clock spring is bad. Can you remove and test the switch for continuity to confirm it is good?

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Customer reply replied 1 year ago
WilltKe it apart again and check....it will be awhile...
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

That's OK. I'm usually on weekdays from 2 to 8 PM EST.

The reason I asked to check the replacement switch is because it is very rare to see a clock spring that is OK for the horn and airbag circuits, but not for the cruise control - as a matter of fact, I've never seen one do that.

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Customer reply replied 1 year ago
O.K.....Before I tore it apart, again, I took it for a test drive on the freeway. At 60 mph, I hit the on button, then the set button....nothing happened. Then I held the set button, the cruise light came on, I hit the set button, and I was in cruise mode......until I had to hit the brakes! After that, nada, again. I was reminded that before it wouldn't work at all, it got to where it just wouldn't hold in cruise very long....should I still run all the tests again?
Customer reply replied 1 year ago
The replacement switch is a Motocraft.....which does not mean that it cannot be defective!
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

That's interesting. So it seems that the cruise did work after all, albeit just for that one time. That sounds like there is an intermittent open circuit somewhere between the switch and the PCM; however, the fact that the light did not come on when the switch was turned ON, tells me we still don't have sufficient data to rule out the switch or the clock spring as being the culprits.

I don't know how familiar you are diagnosing intermittent circuit faults, but it can be a major headache. Recognizing they had that kind of problem, Ford came out with what they call "wiggle tests"; meaning you grab a hold of the suspected wiring harness and connector and shake the heck out of it to see if the issue can be duplicated. Thing is we have several connectors involved in this circuit.

One thing that could make our task a lot easier would be if you could plug in a NGS or equivalent scan tool that would show the PIDs related to this issue. Is there anyway you could get your hands on one of those? If not, there's just those "wiggle tests"...

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Customer reply replied 1 year ago
Would the scan tool offered by one of the auto parts stores be able to diagnose the problem?
Customer reply replied 1 year ago
I mean the free test they offer.....not the tool itself...
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Not unless the check engine light is on and there a codes set. You see, the auto parts stores call those things "scan tools" for marketing purposes, but they're are nothing but code readers only good for retrieving and erasing codes. The NGS scan tool I'm talking about is what we used at the Ford dealer and would be the best option; however, there are aftermarket companies like SnapOn, OTC, Autel, and more that make scan tools that can almost duplicate NGS functionality.

You see, the way manufacturers have set things up, you need very expensive tools that require very expensive training to diagnose most of the computer-controlled systems on the vehicles they sell - they have used loop holes in the Clean Air Act to basically create a monopoly where you have to take your vehicle to them in order to get it fixed. It sucks...

Sorry for the rant, didn't mean to sound like Bernie Sanders ;-)

So it looks like its back to the wiggle...

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Customer reply replied 1 year ago
Do I leave the air bag out? Wiggle while I drive? Should the cruise light come on when I touch the button, or do I have to hold the button while I hit set? This is a process that I certainly understand, but that I'm not familiar with!
Customer reply replied 1 year ago
Or.....would I likely just solve the problem if I installed a new clockspring?
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Do I leave the air bag out? Yes

Wiggle while I drive? I wouldn't recommend doing that. The cruise should turn on with the engine running and the truck not moving, then set once the truck is moving at over 40 MPH

Should the cruise light come on when I touch the button, or do I have to hold the button while I hit set? The sequence should be; Turn switch on; reach desired speed; set cruise (light comes on)

Or.....would I likely just solve the problem if I installed a new clockspring? That's impossible to know at this point. The intermittent open could be anywhere in the circuit, the clockspring being just one part of that circuit.

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Customer reply replied 1 year ago
Well, twice now I've gotten cruise to come on, only to quit when I hit the brake (which it should), only after that I couldn't get it to come on again. It did it once yesterday and once today after I fiddled with the wiring on the brake peddle switch thing. Really confuseing. Couldn't duplicate the situation.
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

I understand. I wish there was something more I could contribute other than what I've already have. It all boils down to having the proper scan tool...

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Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

At this point, it looks like I have nothing else to contribute. I'll opt out and reopen your request to the field in case another expert wants to chime in. Please do not reply until another expert responds or the site will cycle the request back to me.

Best Regards.

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Ford Mechanic: Chris (aka- Moose), Technician replied 1 year ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 49,129
Experience: 16 years experience
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Welcome, I'm Chris (aka Moose).

Different tech here, would you like me to try and help?

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Customer reply replied 1 year ago
Absolutely!
Ford Mechanic: Chris (aka- Moose), Technician replied 1 year ago

Super, is this still the only issue we are addressing "1999 Ford F350 Diesel cruse control doesn't work, light doesnt come on."

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Customer reply replied 1 year ago
This is the only issue...no cruise control.....
Ford Mechanic: Chris (aka- Moose), Technician replied 1 year ago

Thanks, ***** ***** how Ford wants this concern diagnosed. https://dl.dropboxusercontent.com/u/90220402/speedcontrol..pdf

If you would prefer me go through step that needs to be done I can do that it will just take longer.

Please make sure to select a rating from the top of your screen prior to logging off so the post does not time out.

Thanks Moose.

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