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Most probably the cruise control cut off switch on the master cylinder which is what the recall related to.
if you order a new one it comes with a new fusible link as well as the switch. No need to drain the master cylinder to replace as very little drips out.
Quick way to check if it is that, unplug it and jam a mini blade fuse in the end of the lead. See if it works as usual. If it does, replace the switch. It's a secondary safety feature and there as a back up to disable cruise if the brake switch goes south.
Replaced master cylinder sensor and switches in steering wheel. Cruise still not working. No cruise related lights on dash. Tried test procedure to get dash lights to spit out error code but that did not work. All fuses look good. Now what?
Check 3rd brake light bulb first. Use incandescent bulb.
After doing this, you’ll need a scan tool. Many of us use FORscan Lite ($6 app) and a BAFX OBD2 BT dongle ($20). This does almost everything the dealer scan tool can do.
On MY L99 if I don't drive it for a month or more the cruise won't work at first - The first time it did this so I just kept pushing the buttons and it came on just fine.....may be the case here as well??
I'm thinking the contacts inside the switch may get "dirty" from non-use..
If parts throwing is not on your schedule of events, look closely at post #2, which I have quoted below. This is the method any competent shop that charges $100 per hour or more or Ford would resolve the issue.
Good luck and keep us updated.
Originally Posted by FordTruckNoob
The Tech Folder has the diagnostic procedure. Linked here for your convenience.
The PCM needs to see a ground (not open circuit) on the brake on/off (BOO) input for cruise to be enabled and 12v when the pedal is depressed. On a 99-up, that ground is supplied through the brake light switch and a dedicated ground - not any light filaments. The brake pressure applied (BPA) input needs to see 12v from the fire-starter switch on the master cylinder to enable cruise control and an open circuit with the brake depressed to cancel.
These two inputs are visible in ForScan and with a factory tool. If both of these are good, the inputs from the switches need to be verified. Again, ForScan has them I think....but I know for sure the Ford tool does.
For clarification sake, the 95-97 trucks get the BOO ground signal to the PCM through the brake light filaments (not JUST the center high mounted stop light - CHMSL). This is why LEDs often cause issues with them.
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