LS factory cruise control hook up

[XwalkerX]

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]

[XwalkerX]

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.

[ls1nova71]

Originally Posted by XwalkerX

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

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

[XwalkerX]

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

[ls1nova71]

Originally Posted by XwalkerX

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

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

[XwalkerX]

Originally Posted by ls1nova71

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

[XwalkerX]

ok standby.

[XwalkerX]

Also here is a pic of the faint brake light symptom

[ls1nova71]

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?

[XwalkerX]

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

[ls1nova71]

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.

[XwalkerX]

thanks man!

[XwalkerX]

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

[ls1nova71]

Originally Posted by XwalkerX

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

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.

[XwalkerX]

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

[solidaxel]

Did you tell us your tail lights were LED ?

[ls1nova71]

Originally Posted by XwalkerX

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

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.

Originally Posted by solidaxel

Did you tell us your tail lights were LED ?

He said no LEDs.

[Andy4639]

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.

[Andy4639]

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


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

[ls1nova71]

Originally Posted by Andy4639

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.

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.

[Andy4639]

Originally Posted by ls1nova71

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.

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

[doublebeetx]

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

[ls1nova71]

Originally Posted by doublebeetx

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

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

[XwalkerX]

with the 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


also I forgot to include that I have an inline fuse wired in to the power wire right before the bottom split on my diagram

I also picked up a 12v zenner diode this weekend that I have yet to wire into the G wire to get rid of that voltage going to the brake lights until the pedal is pressed.

[XwalkerX]

so just wired in the zener diode to the G wire so my brake lights are not affected by the 10v being sent from the cruise unit.

just re-tested to confirm everything is in complete working order

key on, engine running, connector unplugged to test leads:

A- off position - 0v
A- on position - 12v
B- (with A still "on") 0v resting; 12v momentary toggle down pressed
C- (with A still "on") 0v resting; 12v momentary toggle up pressed
D- 12v resting; 0v brake pedal pressed
E- 0v (ground)
F- 12v regardless of toggle A position
G- 12v brake pedal pressed
H- n/a
J- n/a
K- 11.6v