Cruise control on a reworked LS2 harness

[Magntik]

Has anybody had any luck getting the cruise control to work with on of these reworked factory DBW harnesses?

Mine is reworked by Speartech, I've tried to talk with him about it but he comes off pretty vague and not a lot of help, IMO.

I found a thread and link over on LS1tech, wired everything the way it suggested. Everything functions as it should according to the Post-er. But when I drive it...Nothing.

The ECU in the thread is an '04 from a Silverado with DBW.
Maybe that's my problem?

[Samckitt]

John told me that the cruise is controlled by the Body Control Module (BCM), not the Powertrain Control Module (PCM). He also said they are looking into an aftermarket controller for this.

[Magntik]

Think I'm calling him tomorrow, because he told me to get a GM stalk and it could be hooked up.
I have a total of 5 wires pulled and tagged for cruise.
I'd like to use them if possible.

And it would make Power Tour a little nicer.

[garys 68]

What trans are you using?

[Chad-1stGen]

Subscribing. I've always wondered about having cruise on a pull out LS motor.

[Magntik]

My engine/trans is out of an '06 TBSS. LS2/4L70E

[garys 68]

Unlike the 06 vett or GTO, the TBSS does not use the BCM for CC. It should work if wired properly. Do you have the TBSS schematic and compared it to your harness. The 04 silverado is a different ecu and pinouts compared to the TBSS.

[Samckitt]

Hmmm, my setup is from the TBSS too, and told John that & he still said different controller.

[Taylor1969]

I am pretty sure that cruise is controlled on the E67 ECM. I have a TBSS engine and computer and will see if I can get the cruise working. I'll give feedback here if I do (should be in the next 3 weeks or so)

[Magntik]

got to talk briefly with John at Speartech and he told me that as long as I was using a GM stalk, hook the wires right to it.
I forgot to ask him the difference between a GM and Dakota Digital's stalk

[Samckitt]

got to talk briefly with John at Speartech and he told me that as long as I was using a GM stalk, hook the wires right to it.
I forgot to ask him the difference between a GM and Dakota Digital's stalk

Wonder Why did he tell me it can't be done?

[73z-6sp]

tgyhbnjmk

[Magntik]

Then it should work! Have you used a voltmeter on each wire from relay/switch to make sure they are each doing what they should be in each position of the switch? Its gotta be in the wiring somehow. Did you specifically ask about your silverado ECM?

Hi, Aaron,
No I have a TBSS ECU, the Silverado ECU is what there were using in the thread you emailed to me. I think that's the problem. They are too different.
And according to the thread we were talking about, yes the wires do exactly what the thread says they should do for each position of the switch.

I haven't gotten a chance to send you the email with the wiring diagram I had gotten from IDIDIT, but I did find it printed out. Just no time to try it. That one uses just one relay.

[Magntik]

Wonder Why did he tell me it can't be done?

I don't mean any disrespect to the guy, but I personally haven't been overly impressed with my dealings with him. BUT that's me, other guys here and on LS1Tech sing his praises.

[73z-6sp]

gbhnjmk

[garys 68]

The Dakota Digital colum has normally closed switches (Ford style). The GM controls are normally open. You can use the DD stalk by changing some wire positions, but you'll only have on/off and the cruise button function.


got to talk briefly with John at Speartech and he told me that as long as I was using a GM stalk, hook the wires right to it.
I forgot to ask him the difference between a GM and Dakota Digital's stalk

[Taylor1969]

I don't mean any disrespect to the guy, but I personally haven't been overly impressed with my dealings with him. BUT that's me, other guys here and on LS1Tech sing his praises.

Me either - I called a few times to ask questions and he always seemed too busy to talk... He said that he would remove VATS and emissions from my PCM and put a base tune on it for free..... but I saw a $200 charge on my invoice for that along with a $50 higher charge on the harness than we had discussed. As long as everything works 100% fine I'll take that as a lesson learned to get everything in writing from now on. If I do have issues I am going to raise a big stink - as I was charged 25% higher than I was quoted.

I went with him because of his reputation, but if I ever buy a harness again I'll use one of the cheaper guys for sure. I would have saved enough money in this deal to get a dyno tune locally and spend the extra time working on any issues that may (but probably wouldn't) come up with one of the cheaper guys.

[Samckitt]

Anyone know where to get a wiring diagram of the Trailblazer PCM input/outputs?

[Speartech]

Has anybody had any luck getting the cruise control to work with on of these reworked factory DBW harnesses?

Mine is reworked by Speartech, I've tried to talk with him about it but he comes off pretty vague and not a lot of help, IMO.

I found a thread and link over on LS1tech, wired everything the way it suggested. Everything functions as it should according to the Post-er. But when I drive it...Nothing.

The ECU in the thread is an '04 from a Silverado with DBW.
Maybe that's my problem?

I can only assume your setup is an LS2/4L70E using the TBSS operating system (E67 ECM/T42 ECM).

We've done several of those and the cruise works perfect!

The main things that will cause the cruise to NOT work are:

1. Improper brake switch hookup (you have to follow the instructions exactly).

2. Stalk switch not compatible or does NOT emulate the GM method.

3. LED brake lights. The cruise brake switch relies on a light bulb filament to transition the signal low. LED bulbs can't do that. If you have LED lights, you can add a pull-down resistor to the circuit to simulate the bulb filament.

John

[Speartech]

Wonder Why did he tell me it can't be done?

You're over-generalizing the whole thing.

He's running a TBSS LS2/4L70E setup (I think). You're wanting to run an E67 LS2/T56. That's not the same operating system at all, and the cruise control works entirely different. You can thank GM for that, not me. We are working on an aftermarket cruise control that should work with ANY of these setups, but there is little time right now to finish the development of it.

John

[Speartech]

I wii second that he isn't the easiest person to talk to nor is he overly eager to offer help. He says the minimum required in my experience.

I'll even third it! I didn't get into this stuff for a personality contest. Some will like me, some won't. I try to provide FACTUAL information in as few of words as I can. Why? Because the next phone call is waiting. Gone are the chit-chat days when I could sit and discuss everyone's projects with them. I try to get to the details quickly and tell people what works and what doesn't.

We have 10 fully set up and running engine/transmission combinations and 2 vehicles in here for testing and R&D so that our products deliver as advertised. That's the main thing I'm after.

I think you're the guy wanting to use the M/C pedal with your TBSS setup and I told you it wouldn't work and that you needed to use the TBSS pedal. That's all I told you. Whether you believe it or not is up to you. Try the M/C pedal if you want and see if you can get it to work.

John

[Speartech]

Me either - I called a few times to ask questions and he always seemed too busy to talk... He said that he would remove VATS and emissions from my PCM and put a base tune on it for free..... but I saw a $200 charge on my invoice for that along with a $50 higher charge on the harness than we had discussed. As long as everything works 100% fine I'll take that as a lesson learned to get everything in writing from now on. If I do have issues I am going to raise a big stink - as I was charged 25% higher than I was quoted.

I went with him because of his reputation, but if I ever buy a harness again I'll use one of the cheaper guys for sure. I would have saved enough money in this deal to get a dyno tune locally and spend the extra time working on any issues that may (but probably wouldn't) come up with one of the cheaper guys.

Ripping people off is NOT part of my business plan.

Send me your name so I can look up the records and if I quoted you something different than what you were charged, you will be refunded immediately.

John

[Samckitt]

You're over-generalizing the whole thing.

He's running a TBSS LS2/4L70E setup (I think). You're wanting to run an E67 LS2/T56. That's not the same operating system at all, and the cruise control works entirely different. You can thank GM for that, not me. We are working on an aftermarket cruise control that should work with ANY of these setups, but there is little time right now to finish the development of it.

John

Ah I see. Thanks John for clearing it up. Is the computer for the LS3 any different? Cruise built into the PCM, work with the T56? I am debating going that route on a 6.0L with LS3 heads/intake.
Thanks

[Magntik]

I can honestly say I have no gripes about what I was charged or the quality of the work done.
I paid to have the harness "thinned" out and the ECU program changed to work for me.
And that is exactly what John did for me. And he even had it to me real close to the time frame he quoted.

I did end up taking my care to the dyno for what I thought may be tune issues but it turned out to be a faulty (brand new aftermarket) Mass Air Flow sensor.
So while the car was there I talked with the guy about checking everything over, program wise. He made some pulls on the dyno and said it was as close as someone could get it without having the car. He tweaked a couple things based on our talk, to pick up a couple horses. Ended up getting like 24 more horses.

John did and charged exactly what he said he was gonna do. And everything worked flawlessly.

I think my issue with the cruise is more a GM thing, me just not understanding the whole thing and John being a busy guy.



But I'm gonna keep working on it because I really want the cruise to work.


I really don't think I'd risk my stuff with one of the "cheaper" guys. You get what you pay for most times. I think trying to replace a ECU and a harness, or the frustration over it not working would be a pain in the a$$.

If/when I do another one, I'd send my stuff back to John.

[Magntik]

I can only assume your setup is an LS2/4L70E using the TBSS operating system (E67 ECM/T42 ECM).

We've done several of those and the cruise works perfect!

The main things that will cause the cruise to NOT work are:

1. Improper brake switch hookup (you have to follow the instructions exactly). Your instructions say a switch with zero volts when brakes are applied, that's what I have, contacts are normally closed

2. Stalk switch not compatible or does NOT emulate the GM method.It's a Dakota Digital stalk, found on the 'net about using relay to switch functions, works according to those instructions. This may be my problem.

3. LED brake lights. The cruise brake switch relies on a light bulb filament to transition the signal low. LED bulbs can't do that. If you have LED lights, you can add a pull-down resistor to the circuit to simulate the bulb filament. Nope, standard taillight bulbs

John

John do you have any input on relays to change the Dakota Digital stalk to work like a GM? Because I'm not clear on what vehicle to get the proper stalk out of.

Thanks

[73z-6sp]

sfdgh

[garys 68]

Magntik
1. you need both the NO (brake lights) and NC brake switch wired to the ecu. In addition, if the ecu is set up for a manual trans, you need a clutch pedal position switch. Also note 98-02 f body CPP switch grounds, vette, DBW trucks apply 12 V.
2. The DD stalk is NC (except for on/off). You can reverse the functions with relays. However, there's a momentary closing of the "accel" circuit when you hit "set" on the DD stalk that I dont think the GM stalk does. Not sure of the effect on the CC. You can use that to wire the accel wires to the set pins on the ecu. You'll have on/off and set functions, but not accel.
Check out this link too.
http://www.ls1tech.com/forums/conversions-hybrids/1365002-dbw-cruise-control-lever.html

[Speartech]

John do you have any input on relays to change the Dakota Digital stalk to work like a GM? Because I'm not clear on what vehicle to get the proper stalk out of.

Thanks

You can use relays to reverse the operation (NO to NC, or NC to NO) but I don't know for sure if that will fix the DD stalk. It seems like it should though. You can also set up the exact GM cruise switch orientation using 3 toggle switches (1 normal off/on and 2 momentary on). That's all the GM stalk switch is really doing anyway. We have wired up separate switches like that mounted in the console before.

John

[Speartech]

Ah I see. Thanks John for clearing it up. Is the computer for the LS3 any different? Cruise built into the PCM, work with the T56? I am debating going that route on a 6.0L with LS3 heads/intake.
Thanks

No, the TBSS is the only 58X application that does it that way, unfortunately.

John