Cruise control help

[sman]

Never put a cruise on my car since the swap, and since my v6 was drive by wire there was no cruise control box. I have since acquired one and mounted it. The problem is the wiring....

Long post, my appologies....

Coppied from ls1tech....

1) I personally used a 1999-up F-body cruise control module. I have a 98 ls1 setup and the 99 uses the same throttle body so the 99 cable worked perfectly!
If I had a 2000 f-body setup I would have needed the 2000-up cable however the cruise control module is the same.

2) from what I have been told the 4.3 s-10 module will work as well. I have not tried this but I don't see why it would not if the cable fits the ls1 throttle linkage and is correctly spaced for tention on the cruise cable. this should hold true for any of the later GM cruise control modules and cables. But be careful! many of the cables connect to the cruise control module in a differant fashion (3 seperate ways that I can think of from the top of my head) making it hard to just swap cables around. some of the truck 4.3 ones look like they attach just like the ls1 f-body cable so... this may work???

now lets get to the wiring!!

as you may have guessed by now all of the GM cruise modules of the later desighs look to have been wired up the same. (I have looked at alot and this seems like a standard however you will need to double check to make sure befor cooking I mean hooking up your module )

so here we go,

Pin. Use

A ........ Cruise "ON/OFF" input from switch
B ........ Set/Coast input from switch
C ........ Resume/Accel input from switch
D ........ Normally Hot 12v from brake/clutch switch
E ........ Ground
F ........ Hot in run 12v
G ........ Normally 0v brake input (needs 12v from brake applied only!)
H ........ Cruise inhibit signal pcm control (needed depending on year make and model! 99-up f-body needs this to work unless you use a differant year cruise control)
J ......... Cruise engaged status to pcm (not needed!)
K ........ VSS from pcm/feed to cluster

right from the service manual.......

"Battery voltage is applied to terminal F of the cruise control module when the ignition switch is in the RUN position. When the slider switch is moved to the ON position, battery voltage is applied to terminal A of the cruise control module. The cruise control module needs to receive brake input voltage at one of the following terminals once each ignition cycle before allowing cruise to operate:
Terminal D
Terminal G
The brake input voltage is received at the cruise control module through the following components:

The A/C CRUISE Fuse 12
The cruise control release brake switch
The cruise control clutch switch on vehicles equipped with a manual transmission
The voltage to the cruise control module terminal D is interrupted if either of the above switches is open. Terminal G must see a ground path through the CHMSL bulb in order for the cruise to operate properly. If the brake pedal is depressed, battery voltage is present at the module terminal G. When the slider switch is moved to the RESUME/ACCEL position, battery voltage is applied to terminal C of the module. With the set switch depressed, battery voltage is present at cruise module terminal B. Cruise module connector terminal K is the speed signal terminal. During operation the voltage will oscillate between the following levels:

A high of 4 to 5 volts
A low of near ground
The cruise module ground is at module terminal E."

I have all the terminals figured out except for D and G.

It looks like pin 33 on the blue ls1 pcm has 12v to it unless the brake is applied, so that takes care of pin D.

But what wire can I tap into to get me 12v when the brakes are applied.

Terminals D and G are direct opposites, why? I have no freaking clue, ive been working on this for months and just cant figure these 2 out.....

I have a 45min drive to work everyday and would desperately like to get this sorted out.

PLEASE HELP!

[meissen]

Meh, the easiest answer to that would be to tap into the wire that supplies 12v to the brake light when the brakes are on... but that's a lot of wire running.

[sman]

You have got to be kidding me... B, Ive been trying to figure this out for months and it took you 3 min to get it. Sigh... That is a long wire run though. Ill consider it my standby option.

Anyone else?

[meissen]

Always takes another set of eyes to solve the hardest problems.

[meissen]

Also - not sure if this is good or not but Pin 33 on the Blue connection to the PCM is TCC Brake Switch.. might have some sort of power or reaction when the brake is pressed unless I'm not understanding it correctly.

You could also check the wiring that goes to the automatic shifter assembly - there's a solenoid in there that doesn't allow you to take the car out of park unless you're pressing the brake. Chances are there's 12v or a grounded circuit when the brake is pressed that triggers the solenoid to allow the shifter out of park.

[meissen]

Alright - I just confirmed via LS1Tech that the TCC Brake switch is 12v and 0v. Whether it's 12v when the brake is pressed or 0v when the brake is pressed - not sure... but I'm sure with a relay you could make that pin work.

Edit: Guess I should have read your whole post.

[sman]

You could also check the wiring that goes to the automatic shifter assembly - there's a solenoid in there that doesn't allow you to take the car out of park unless you're pressing the brake. Chances are there's 12v or a grounded circuit when the brake is pressed that triggers the solenoid to allow the shifter out of park.

Sweet, ill try this. Thanks B.

[Transamsfast]

dont run all the way to rear of car for 12v for brakes.... figure out color and rip a rocker panel off. all wires run on drivers side

[meissen]

Good point, Derek!