Cruise control quit working on my truck. No big deal but handy on long trips. Checked fuses and all are good. When holding set button down and hitting the resume button the horn blows. Thinking short in steering column. What do you guys think? thank you

 

Yes, that's a bad clock spring.

 

Just Curious, Does yours have the pressure switch on the top/front of the master cylinder?
IF so, is it DRY/NOT leaking?
There was/Is a recall on MANY of these trucks, WITH this switch.

 

That's interesting. Many times the airbag system faults first and then other strange problems start when the clockspring starts to crack.

 

well I changed the clock spring And the relay. still no cruise control. what is next guys? thanks

 

Does the horn still blow as you described?

Do you have a digital multimeter? You can test the voltage by backprobing your servo connector. This is also a good way to test your steering wheel control buttons. I actually have a spare set somewhere around here.

Clutch or automatic transmission?

Try the instructions posted here: http://www.doityourself.com/forum/pi...procedure.html

 

Xsleeper, I did the test and it flashed twice. So that means it is the brake pedal position switch or otherwise known as the cruise control cutout sensor. thanks.

 

awesome! glad you figured it out. sorry about the clock spring comment... If I would have thought about it clearly, it's when the horn also doesn't work that it's the clock spring.

 

Interesting procedure, XSleeper...any idea what model years it covers? Newer vehicles use a drive-by-wire throttle--how does one know if the dynamic servo test is working if the pedal has no cable to move it?

Also @OP: What does Set/Resume normally do? I've never heard of any need to hold any buttons depressed in normal operation of the cruise control so maybe that initiates a different mystery test?

--Or do I misunderstand?

 

Well xsleeper that did not work. I did the test after putting the new part in and now I have 3 flashes. Which is the deactivation switch according to the chart. Isn't that the same thing?

 

There are several sensors that will override the cruise. You have a pressure switch on the master cylinder, the brake switch, and possibly a clutch switch.

If you'd test the voltage on the clutch servo connector that would help with the diagnosis.

Pin 9 should show 12V
Pin 7 should show 12V
Pin 5 should show around 8V at KOEO
Pin 5 should show 12V (as it should) when pushing the cruise ON button
Pin 5 should show 0V when pushing the cruise OFF button
Pin 5 should show around 3.5 V when pushing the SET/ACCEL button
Pin 5 should show around .9 V when pushing the COAST button
Pin 4 should show 12V while pushing the brake
Pin 4 should show 0V when not pushing the brake

I think I have heard that a burnt out brake light can affect the brake circuit. Remember that on the Ford onboard diagnostic test, 2 flashes can mean possibly 4 different things. You probably guessed wrong. Its better to figure this out electrically, since this is probably an electrical problem.

I'm not totally sure what years it covers, but probably 97-04, at a minimum.

 

Finally got it figured out. It was the inline fuse on the pressure switch. This was added in the recall in 2005. Thanks for helping out.

 

Nice job... good feeling once you get it fixed!