Re: LS factory cruise control hook up
 

just hooked up all the wires again and with the key on im still getting a reading of 7v at the wire for pin G where it connects to the brake lamps. this is causing not only a noticeable draw on the battery via my voltmeter but also causing a very faint brake light to be on all the time.

still with key on and taking readings at the module with the connector plugged into it im getting these readings

a- 0v (toggle switch is in the off position)
b- 0v
c- 0v
d- 12v
e- 0v
f- 12v
g- 10v
h- n/a
j- 0v
k- 9v

Re: LS factory cruise control hook up
 

also id like to test the VSS output wire. mine is a black wire but its the only wire on either connectors at pin 50. my truck does have a custom harness on it but I would think the PCM still needs the wires in the factory position.

anyway since I cant find an answer via google...what should the VSS output wire read with the key on? should it read differently with the engine actually running? I understand it will send a pulse signal *while driving* but im not sure if there should be any voltage on this wire otherwise.

Re: LS factory cruise control hook up
 

I don't think you'll get any voltage on the VSS wire with the key on or just idling, pretty sure you need to be moving and it will be an AC voltage. This evening I will unplug my cruise module on my truck and test them to see what they are supposed to be and then we can compare the readings.

Re: LS factory cruise control hook up
 

thanks man

this has really stumped me

and again I only get these strange power bleeds when the connector is plugged into the cruise module itself with key on which is why I was questioning if its actually working correctly. the seller claimed it was working good prior to removal?

Re: LS factory cruise control hook up
 

Ok, I just checked two of my cars and they are both the same as yours. I get 9.8v on the VSS wire, so that must be normal. I also get 9.5v on the G wire with the module plugged in and that wire not hooked up. I checked it by unplugging the module then plugging in another pigtail and running the wires from it to the original plug, that way I didn't have to cut anything. Pay no attention to the colors, the second plug is actually a TAC module plug as they're the same plug and it's all I had.

You say you are getting very faint brake lights? Are you using LEDs?

Re: LS factory cruise control hook up
 

not using LED's but I do notice faint brake lights and also notice a draw on my voltmeter when I hook the g-wire up to the brake switch.

Re: LS factory cruise control hook up
 

I mean thinking about this it would make sense that my brake lights are illuminating because im sending 9-10v to that wire which should only become hot with 12v (turning on the lights) when the pedal is depressed.

would adding a relay here help cure this? similar to what people have to do with LED tails?

Re: LS factory cruise control hook up
 

Nova What's your voltage reading where the G wire ties into the brake switch wire? Do you also show 9/10v there?
Posted via Mobile Device

Re: LS factory cruise control hook up
 

I don't know why it does this, but mine do it too. I'm a mechanic, not an electrical engineer by any stretch. I can usually get things to work the way they are designed to work, but don't always know why they work the way they do.

You would think my brake lights would be on too, but they aren't. I do know modules can do some weird things, but if you were sending 9-10v to the brake lights, you'd see more than a faint glow, they would be obvious that they were on. I would think even 7v would be pretty obvious. Adding a relay won't do a thing for it.

I only measured it where I had the extra pigtail hooked to the original one, but since that wire only goes straight to the switch, it has to have 9.5v there since there's pretty much no way you'll get very much voltage drop from a 6 foot long wire.

What is this going in? And how are you testing it? Actually driving it?

Re: LS factory cruise control hook up
 

the basics from my swap are

L33 5.3
earlier 2wd 4L60e
99-02 PCM
99-02 Cable TB
prevatt harness
dakota digital speedo drive
dakota digital tach signal converter
old air a/c

http://img.photobucket.com/albums/v2...shzrbaltd.jpeg

http://41.media.tumblr.com/af52da8aa...hxno1_1280.jpg



the truck drives just fine.

im testing it every which way i can with a multimeter.
i tested all the leads with the key on and the key off
im testing voltage at the connector when its unplugged from the cruise module
im testing voltage at the connector when its plugged into the cruise module
im testing the wire tie in points with the connector plugged in and unplugged
etc etc.

i think im going borderline insane because i cant figure this out...:fry:

Re: LS factory cruise control hook up
 

Nice looking truck! What I meant though, was are you checking the function of the cruise by driving it? Or is it in a garage on jack stands?

Re: LS factory cruise control hook up
 

well i take it for a spin around the block and get up to 40mph then try to engage the cruise.

i turn on the power toggle then hit the momentary for the set function but it doesnt engage -____-

Re: LS factory cruise control hook up
 

Did you try hitting the resume side of the switch just in case you have them backwards?

Re: LS factory cruise control hook up
 

yeah tried both ways.

even tried with the power toggle in on and off positions

Re: LS factory cruise control hook up
 

Ok, just wanted to check. So you are using a GM brake light switch with the two sets of contacts, correct? What you might try now is adjusting the brake light switch in a little bit. Sometimes the two sets of contacts in them will be off a bit and although the brake lights may not be on with the pedal released, the other two contacts may not be closed. Adjusting it in so you have to press the pedal a little farther to make the brake lights come on might help.

Re: LS factory cruise control hook up
 

If that doesn't help, then unplug the connector and test pins E and D. Put the ground probe of the multimeter on pin E and the positive on pin D and make sure there's 12v. If you do have 12v, then while still checking those two pins, have someone press the brake pedal and see if it goes to 0v.

Re: LS factory cruise control hook up
 

so when i was going through the whole initial freak out about the extra voltage at the g and k wires i completely disconnected them and then took readings at all 4 leads coming off the brake light switch (and yes the GM one) the brake light switch is currently functioning great.

(key on)
first set of contacts:
lead 1= constant 12v [this is tied into pin F]
lead 2= 12v until the pedal is pressed then it cuts voltage to 0v [this is where pin D is plugged into]

second set of contacts: (which runs the brake lights)
lead 1= constant 12v
lead 2= 0v until the pedal is pressed then it reads 12v [this is where pin G is connected]

Re: LS factory cruise control hook up
 

youre saying test E and D on the connector side where it plugs into the module?

ill even try to test it with someone stepping on the pedal to make sure voltage cuts with pedal pressed.

Re: LS factory cruise control hook up
 

also if i havent mentioned it before im VERY grateful that youre helping me troubleshoot this

Re: LS factory cruise control hook up
 

Yes, on the plug it's self, not the module.

Re: LS factory cruise control hook up
 

ok standby.

Re: LS factory cruise control hook up
 

No problem. Just to be sure though, everything is connected up now, right?

Everything is wired up as it should be currently

Here is the test with key on at points D and E

Posted via Mobile Device

Re: LS factory cruise control hook up
 

Also here is a pic of the faint brake light symptom

http://img.photobucket.com/albums/v2...pszh5ibfgn.jpg

Re: LS factory cruise control hook up
 

So you have 12v between E and D, that rules out it not being grounded. Did it drop to 0v when the pedal was pressed? As for the brake lights, that's just odd, never seen that before, but do they go out when you unplug the module? Do they go out when you turn off the on/off switch?

Re: LS factory cruise control hook up
 

yes it drops to 0v when pedal is pressed

and if i unplug the connector from the cruise module that faint hint of brake light disappears

Re: LS factory cruise control hook up
 

I have to leave for work now, but will check in the morning to see if mine glow any at all, but don't think they do. I'm leaning towards something being messed up in the module since the wiring seems to be correct and unplugging it makes it go away. I'll let you know what I find in the morning.

Re: LS factory cruise control hook up
 

thanks man!

Re: LS factory cruise control hook up
 

so a friend of mine gave me the idea of running a diode off the g wire to the junction at the brake light wire.

http://frys.com/product/1799257?site...H:MAIN_RSLT_PG


this would essentially make that 9/10v stay only on the G wire and not impact the brake light wire. this way the faint brake light illumination would stop but when I press the brake pedal and it sends 12v to the brake lights it would also send 12v to the G wire back to the cruise module.

so that I think would solve the brake light issue but still doesn't help figure out why the cruise control wont work

Re: LS factory cruise control hook up
 

I checked my cars today and the brake lights do not glow at all, but yet I still get that 9v on that wire. Its really strange. After all the tests you have done and seeing that it appears to be wired right, I think I wuld try another module. If you dont have a junk yard near you I can probably find one but not sure what it would cost to ship it.

Re: LS factory cruise control hook up
 

ill try and source out another module this weekend/next week and in the meantime ill have to draw an electrical diagram of how i have everything currently hooked up just to be 100% positive its correct

Re: LS factory cruise control hook up
 

Did you tell us your tail lights were LED ?

Re: LS factory cruise control hook up
 

Yeah, post up a diagram of the wiring so we can make sure it's absolutely right, and if it is I would try another module. If you can't find one just let me know and I know I can get one. I could also slap it on my truck and test it just to be sure.
He said no LEDs.

Re: LS factory cruise control hook up
 

I have 2 questions on this.

1. I have all LED's but with the relay mod it should be fine correct?
I also have the grounded flashers in place will this possibly make it work?

2. I don't have speedometer cable, mine is a GPS speedometer. Their is no cable attached to the trans at all. Will I need the cable to be hooked up?


I want and try to have cruise for the 2016 HRPT since I didn't have it for the 2014 run.:chevy:

Re: LS factory cruise control hook up
 

Found a 4 wire replacement handle.
$44.99. I think a junkyard will be a lot cheaper! ;)


http://www.classicindustries.com/pro.../dd100102.html

Re: LS factory cruise control hook up
 

ls1nova71, will the stalk listed by Andy work for my dbw cruise ? Thanks !

Re: LS factory cruise control hook up
 

1 I'm not familiar with the relay mod? How is it wired?
2 You won't need a speedo cable, just a VSS wire coming out of the PCM.
3 That switch will work, but it will require several relays to reverse the switches inside of it.

Re: LS factory cruise control hook up
 

It will, but there are several relays required to change the normally closed switches inside of it to normally open like a GM switch.

Re: LS factory cruise control hook up
 

I was talking about the relay posted earlier in this thread. On the ground wire.:chevy:

So here is my crude wiring diagram

Hopefully we can figure this out. It would make my weekly 250 mile round trip drive a lot nicer.
Posted via Mobile Device