Help me make a How To on Making Your Own Wiring Harness For Cruise Control (smart people with wiring diagrams apply within) - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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Old 01-20-2012, 04:11 PM   #1
jay-rod05
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Lightbulb Help me make a How To on Making Your Own Wiring Harness For Cruise Control (smart people with wiring diagrams apply within)

After installing my dealer kit for speed control I found that it uses a lot of existing wires and connections in the car so it shouldn't be that hard to remove the speed control servo with cable and install it in any other ford focus as long as it came from the same motor correct?

The way I see it, all ford foci have the studs in the fire wall for the speed control servo, so if you went down to your local pick a part you could just:
  • Unbolt and take the servo (3 bolts)
  • Cut and take the wiring harness from the servo (C831), about 5-6 inches of wire would be ideal
  • Unbolt and take the steering wheel with switches attached
  • Unclip and take the black thingy that the air bag and cruise switches plug into
  • Cut and take the 9 pin harness (C896) about 3-4 inches back that the black thingy gets plugged into it
  • Cut and take the Brake pedal position switch (C824) not to be confused with the stop lamp switch (C444) that all cars have

Then you would just need a lot of wire and you could just wire everything up from their sources.

I found a wiring diagram for a 2002 Ford Focus and traced all the connection and wires that go to the speed control servo but I want to make sure I get everything right.

EDIT: REMOVED PICTURE AS IT WAS WIRED WRONG



Last edited by jay-rod05; 01-22-2012 at 08:34 PM. Reason: Picture was wrong
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Old 01-20-2012, 04:15 PM   #2
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Crap, maybe this should be in the technical forum? Mods please move if you can.
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Old 01-22-2012, 08:33 PM   #3
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I went to pull-a-part today and found a couple foci that had cruise still on them so I pulled one off an SPI automatic.

I've got it all figured out (I think) except where to tap into the ignition power. Below is everything mocked up. Out of the 10 pins on the connector 8 are used (pins 2 and 8 are blank).

If someone wants to verify that this can work please let me know and I'll make a full write up with pics on how to pull everything too.

I know the pictures are huge but the images within the image are close ups that I shrank down to give a clearer picture of details. If you zoom in fully you'll be able to see all the little numbers on the connector pictures that were added into the image.









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Old 01-23-2012, 12:05 AM   #4
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Well for the 2000 to 2004, it is not so simple
For cars that came w/o cruise then later added on that wire harness[s] are different from a car that came with cruise control from the factory. So if one had a non cruise control car [e.g. 2004] and found a junker 2004 that came with cruise from the factory, it is not so simple to switch wire harness easily. [Time solves anything I guess]
The kits were only for 2000 to 2004
I don't know if 2005 was different [I suspect so]

Then your ECU needs to be programmed to enable cruise control.

You will be lucky indeed to find a Ford technician that knows this
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Old 01-23-2012, 07:17 AM   #5
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Quote:
Originally Posted by mikeeshaq View Post
Well for the 2000 to 2004, it is not so simple
For cars that came w/o cruise then later added on that wire harness[s] are different from a car that came with cruise control from the factory. So if one had a non cruise control car [e.g. 2004] and found a junker 2004 that came with cruise from the factory, it is not so simple to switch wire harness easily. [Time solves anything I guess]
The kits were only for 2000 to 2004
I don't know if 2005 was different [I suspect so]

Then your ECU needs to be programmed to enable cruise control.

You will be lucky indeed to find a Ford technician that knows this
I really don't think that is the case though. And the only differences that I saw when I was at the junk yard was the connectors are different per model year. The only thing that would really change is getting the correct clock spring to fit your car, or you cut off the clock spring connector that matches the one you took from a junk car and then splice in your 4 air bag/horn wires.

The ECU didn't come into play at all with the dealer add on kit and it. In fact the dealer add on kit just splices into one wire (PIN 28) which all that's only a vehicle speed sensor wire. Everything else this:

Pins and their functions from Speed Control Servo:
Pin 1: Signal out to gauge cluster to turn light on when cruise control is activated

Pin 2: Blank

Pin 3: Signal into servo to let it know how fast the vehicle is going (taps into wire from PIN 28 coming from PCM/ECU)

Pin 4: Are the brakes being applied? (Normally no voltage)

Pin 5: Signal from Cruise Control Switches

Pin 6: Signal from Cruise Control Switches

Pin 7: Power for Cruise Control SERVO unit

Pin 8: Blank

Pin 9: How fast/hard are the brakes being applied? (Normally no voltage)

Pin 10: Ground
That's all there is to it really. So the PCM/ECU doesn't have to be programed at all. The only difference you would have to take into account is do I have a Zetec or SPI and what kind of clock spring connector do I have?
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Old 01-23-2012, 07:24 AM   #6
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Here's the wiring diagram that I found for the 2002 Ford Focus:

http://www.scribd.com/doc/25981642/Focus-Wires

Go to page 238 and 239. That has the diagram for speed control on an automatic transmission.

You don't have to be technical to understand what is going on in it. Just follow the leads off the speed control module (they're numbered to the left of the wires).
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Old 01-23-2012, 08:10 AM   #7
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PM me your E mail address...
At the very least I can scan the 2000 Focus cruise control wiring, maybe if i can find it, the 2004 wiring and if I can find it the 2005 wiring

and you have the automatic

You are probably right for the 2000-2004 cruise control as the electronic module was added for the upgrade kit, in that the ECu need not be programmed
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Old 01-23-2012, 08:20 AM   #8
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Old 01-23-2012, 09:55 PM   #9
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Hi
I sent you three Emails ALL with attachments
If you are on dial up, I just sent enough data to tie your line up for the next three days

What year Focus do you have?
I wrongly thought that you had a 05 Focus that is why I sent you all the connector views
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Old 01-23-2012, 10:02 PM   #10
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Sweet! Thanks to mikeeshaq I can confirm that this method will work for all 2000-2007 Foci.

Still want to see why the modules are engine specific though, in the wiring there is nothing different. I think I'll go pull a Zetec module from one at the junk yard unless someone has one to donate? The only difference I saw when i was there was the cable connector to the throttle. But as far as the servo, it looked the same.

I'll be working on the full write up over the next few days. I would like to get a little more info on the clock spring connector situation. That seems to be the only PIA thing someone would have to deal with. I'll post up another thread to get people to take pictures of theirs so we can get an idea what the difference is between years and engines.

EDIT: I have an 02 focus, the 05 diagrams just confirmed that everything is the same :)
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