My cruise isn't working, won't even come (no light on dash).


I tried the self test where you turn the ign on with the E-brake on and try holding the cruise off button to enter some kind of diag mode but it didn't work. I found a video on youtube where a mechanic replaced some pressure switch on the master cyl but my master cyl doesn't have what the video showed. I read somewhere about the 3rd brake light having something to do with it. FWIW, my 3rd brake light does not work.

 

So have you tried replacing the bulb in the third brake light?

 

No have not replaced the bulb. Dumb question but how would a bulb kill the cruise lol?

 

https://www.ford-trucks.com/forums/1...l#post15386411

 

Thank you I'll give it try.

 

Bulb was blown, replaced it, still no cruise - won't even come on.

 

Did you replace it with an incandescent bulb and does it now work?

Does the bulb in the cluster come on during the initial power-on bulb prove-out of the cluster?

Is your '04 a Heritage (leftover '03, really) or the "new body style" (NBS for 04)?

If an 04 NBS, the deactivator switch was moved to the brake pedal mechanism under the dash. It still needs to be check as it can cause a completely dead cruise system if the switch is open.

 

Sorry should have better worded my response...


Third brake light bulb is working but cruise is not, new body style.

 

Any chance you found the cause? I just picked up an '04 Lariat myself that also has the same problem. Third brake light works, doesn't appear to be LED- brake lamps work as they should.

 

I remember a few years ago having this problem on mine and replacing the brake switch. But i was also having issues with the brake/shift interlock not releasing as well. But the brake switch sensor is easy to change and inexpensive.