So after my 411 swap I have never been able to get the cruise control to work. I tried a new vacuum control module, and several buffer boxes. All the wiring checked out, and instead of spending 70 bucks on an Autozone refurbed buffer box I decided to go ahead and make the conversion to the LS style electronic cruise control. This new box consolidates the buffer box and the vacuum control module in one convenience package (cleans up engine bay). It also eliminates all vacuum lines. It reads the 4k signal directly from my 411 pcm (or any other LS pcm). You could also retrofit this into a thirdgen with the original ECM just would have a slower signal.

Off to my local picknpull where I pulled the cruise control box and the harness which I cut back as far as I could into the factory harness. I pulled it off a 01 Suburban, but I think all new LS trucks use the same cruise control box. On old hot rod forum I read stated get one without a “H” wire. This one was missing the h wire and just had a plug-in place. I was out the door spending $29 bucks.

The way I thought about this was, this box was basically going in place of the factory buffer box under the dash, so that’s where I decided to put it. The factory suburban cable was a little short, another foot would be perfect, but I was able to get it in behind the radio. I cut a hole in the firewall as high and to the right of the driver’s side (above and to the right of the gas pedal).

I originally had the box mounted in front of the lower heater vents but there was not enough room for the radio and the cc box. I then just pulled out the lower heater vents and slid it in place.

For wiring it up I used a couple of different places to find out ls and original cruise control. I cut the wires out of the original connector that went to the buffer box and spliced them into the new electric CC module.

It basically boils down to
-Three CC stalk wires (set/coast, run/accelerate, power on/off) which correlate with the LS CC module wires.
-Brake on 12v with pedal down (different than the factory thirdgen wiring, which is 12v pedal up), I tapped into the blue stop lamp wire running to the read stop lights.
- 4k input from 411 pm.
- 12v ignition on/off (2 of them)
-ground

First I will start with the wires that come from the original connector that hooked into the original buffer box.
Purpose...............Old wiring..........................LS cruise control module
Cruise on/off.............Pin A (grey).......................Pin A (grey)
Set/coast.................Pin L (dk blue)....................Pin B (dk blue)
Resume/accel...........Pin M (grey/blackstripe)......Pin C (green)
12 v ignition.............wherever...........................Pin D (brown/white)
Ground....................Pin J (black)......................Pin E (black/white)
12 v ignition..............Wherever..........................Pin F (brown)
Brake input...............spliced into blue to rear.......Pin G (lt blue)
4K VSS signal...........Pin D (brown) or from PCM...Pin K (dk green/whitestripe)

I haven’t come up with a solution for connecting the cable end to the throttle body. The original connector is too big to fit where the factory cable was. I have a zip tie tight holding it on now. It is holding but I would like to find a better solutions. Open to any suggestions.

 

cool project, nice work.

 

Thanks, I used it today, it works great!

 

Nice, didn't even think about the cruise with the 411

 

Getting ready to add this on my LS swap, where is the factory buffer box located? I've read the connector for the CC is in the passenger kick panel. Is the buff box black?

I appreciate you sharing.

 

Factory buffer box is behind the center of the passenger side dash. Two 7 mm bolts under the top part of the dash and 2 on the underside hold the metal bracket in.