LS factory cruise control hook up

[duwem]

Anyone have this for drive by wire throttle bodies with TAC modules? (example 2002 LQ9 engine)

[ls1nova71]

Originally Posted by duwem

Anyone have this for drive by wire throttle bodies with TAC modules? (example 2002 LQ9 engine)

It's even easier with DBW. It's 3 wires coming out of the TAC module and a power. I can post which wires later tonight if someone doesn't beat me to it.
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[duwem]

Do you know that from experience or is that info just from looking at the diagram?

Thats the thougth I had as well, but whether computer wise it actually works in real life or not I have not gotten answered.

This is a big part of my decision (if cruise works with DBW) to keep the DBW or put a cable throttle body on.

Thanks,

[ls1nova71]

Originally Posted by duwem

Do you know that from experience or is that info just from looking at the diagram?

Thats the thougth I had as well, but whether computer wise it actually works in real life or not I have not gotten answered.

This is a big part of my decision (if cruise works with DBW) to keep the DBW or put a cable throttle body on.

Thanks,

Yes, my blue truck (build thread in my sig) had DBW and the cruise worked perfectly. The key is to have the right switch. What column are you using?

On your 2002, the wires on the TAC you need are, connector C1 (the engine harness one, not the one going to the pedal) pin 4 dark blue wire is the set/coast, pin 5 gray/black wire is the resume/accel, and pin 14 gray wire is the on/off. You will need an ignition 12v source to power these through the switch. You also have to have the brake lights hooked up and the correct brake light switch for it to work, but that's really all there is to it.

[awhite4557]

My set up is from an 01 Suburban DBW. I used the control switch period correct for my column and followed Ackatack's wiring on his post and my cruise works great. Of course I had to use the relays for the LED lights and relays for his diagram to reverse the polarity of the switch to match the TAC. Here is a link to his post http://67-72chevytrucks.com/vboard/s...d.php?t=398006

[farmtrucks]

Please do a wiring diagram for DBW

[ls1nova71]

I'm out of town this weekend. Will get a diagram posted on monday.
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[ls1nova71]

Originally Posted by farmtrucks

Please do a wiring diagram for DBW

I really can't make a DBW schematic any easier than the factory service manual. If you already have the engine harness in the truck and it's running, you should be able to hook up the 3 wires from the TAC module to the cruise control lever switch along with a power and it will work. In this schematic, the wire on the far right where it comes out of the 'Fuse Block-I/P' and is labled 'VEH STOP fuse 15a' (f9 c1) this is the wire you would hook to the brake light switch, on the side that is hot (12v) when the brakes are applied. The TAC has to see a ground through the brake lights on this wire, so if you don't have any brake lights, it wont work. I fell for this myself before I put the bed on my blue truck, and then I remembered I needed brakelights!

If you have any questions, just ask and I'll try to walk you through any problems that you may have.