Try the diagnostics to narrow it down. Here's a video.
https://youtu.be/zB-x7d4bw_E
SOURCE: Cruise Control
My Answer:
I've only seen Cruise Controls have 1 or possibly 2 wiring problems by design.
Usually the Cruise Control Servo Unit itself if pretty darn dependable, and will outlast most everything else on the SUV/car.
The most common problem is usually a BAD GROUND wire at the CC Servo
Unit itself, which is located under the hood and usually where it's
mounted off to the drivers side at or near the engine firewall, or else
up front nearest the battery box.
The other wiring problem might be a bad connector or dirty connection
point from where the wiring harness is run into and under the steering
column. That connector can be seen from under the dash area and checked
pretty easily with a DVM for proper function.
With either an automatic transmission or clutch driven model there is
one other "safety disengage switch" located on either the clutch pedal
or else the brake pedal, and this switch (if it's not positioned
properly, or defective - as in OPEN) will kill the +12-volt battery
POWER going to the CC Servo Unit itself. The CC light may be ON, but
there still won't be any battery power to the CC Servo Unit, causing it
not to set.
On all newer generation CC units the vehicle "angle" or attitude
sensor, and drive shaft VCO pickup sensor design were dropped, and
instead the monitored engine speed is now taken directly from the
engine's Black Box computer and used as the VCO reference. If this VCO
signal is missing then the CC Servo Unit will not engage as well.
If the CC Servo Unit
uses a vacuum line feed you'll need to check that as well to make sure
the hose is intact and it's making a good snug connection.
If all these points show to be good - then the CC Servo Unit itself is
bad and needs to be replaced. Make sure you troubleshoot everything
else above first as the CC Servo Unit is no doubt pretty pricey in cost, and may not be bad at all.
Hope this solves your problem.
Frank
SOURCE: 2003 Ford Explorer Cruise Control
Check the speed control deactivation switch on the master cylinder. disconnect and use a jumper wire to connect the wires together. If the cruise works it's the switch.
SOURCE: cruise control no longer works. Cruise light comes
Make sure the cable from the cruise control motor to throtle is not broken or unattached.
SOURCE: check engine light, cruise control light flashing,
Take the car to Autozone or similar business for a free code read with a scanner. Depending on what turns up, they will be happy to sell you any needed parts.
SOURCE: check engine light, flashing cruise control light
if you put a scanner on it you'll prob get a code telling you what prob is.if you have a autozone or,pepboys they could put scanner on it and tell you what prob is the only way
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