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  #1  
Old 10-21-2010, 12:53 PM
sheltonfilms sheltonfilms is offline
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Default What does the ON switch do for Cruise Control

So I was sitting around looking at my wiring diagram book and I'm stumped on what exactly the ON switch does for cruise control. It looks as if it doesn't do anything. It doesn't ground out it just connects to a 1k resistor and thats it. It seems as if it doesn't complete a circuit. Anyone have any input on this?
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  #2  
Old 10-21-2010, 12:55 PM
01_ranger_4x4 01_ranger_4x4 is offline
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Default Re: What does the ON switch do for Cruise Control

it turns on your cruise control.
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Old 10-21-2010, 01:10 PM
azgilamonster azgilamonster is offline
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Default Re: What does the ON switch do for Cruise Control

it is also tied into ground
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Old 10-21-2010, 01:24 PM
turbo turbo is offline
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Default Re: What does the ON switch do for Cruise Control

Quote:
Originally Posted by sheltonfilms View Post
So I was sitting around looking at my wiring diagram book and I'm stumped on what exactly the ON switch does for cruise control. It looks as if it doesn't do anything. It doesn't ground out it just connects to a 1k resistor and thats it. It seems as if it doesn't complete a circuit. Anyone have any input on this?
These sorts of circuits are created like this in order to provide a lower manufacturing cost as well as ease of repair. Each 'switch' provides a distinct resistance (and, correspondingly, a distinct voltage drop), so the "other end" can simply measure the voltage to determine which switch was pressed. Once that (momentary) signal is received by the Cruise Control module, the "on" function is latched, the module becomes activated, and the other switches become functional.

Another place where you'll see similar engineering is in automotive steering wheel-mounted controls for audio/navigation/etc systems. ...instead of having two wires for each individual switch, you need only run two wires total, with a different resistance added into the network by each switch. ...much easier (and cheaper) than routing all those wires down the steering column clockspring, and it's actually a more maintenance-free option, as well!
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Old 10-21-2010, 02:34 PM
sheltonfilms sheltonfilms is offline
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Default Re: What does the ON switch do for Cruise Control

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Originally Posted by turbo View Post
These sorts of circuits are created like this in order to provide a lower manufacturing cost as well as ease of repair. Each 'switch' provides a distinct resistance (and, correspondingly, a distinct voltage drop), so the "other end" can simply measure the voltage to determine which switch was pressed. Once that (momentary) signal is received by the Cruise Control module, the "on" function is latched, the module becomes activated, and the other switches become functional.

Another place where you'll see similar engineering is in automotive steering wheel-mounted controls for audio/navigation/etc systems. ...instead of having two wires for each individual switch, you need only run two wires total, with a different resistance added into the network by each switch. ...much easier (and cheaper) than routing all those wires down the steering column clockspring, and it's actually a more maintenance-free option, as well!

Yeah I figured all that. But looking at the ON part of the circuit, when pressed it switches over to the 1000 ohm resistor and stops there.....unless the horn is pressed. The servo never "sees" anything when the ON button is pressed.

Now if the wire went from the resistor to the "cruise control ground", that would make perfect sense. 1000k -ON, 2200-RESUME, 680-SET/ACCEL, 120-CANCEL, and 0-OFF. Is this just some sort of "typo"?
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Old 10-21-2010, 02:54 PM
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Default Re: What does the ON switch do for Cruise Control

Quote:
Originally Posted by sheltonfilms View Post
Yeah I figured all that. But looking at the ON part of the circuit, when pressed it switches over to the 1000 ohm resistor and stops there.....unless the horn is pressed. The servo never "sees" anything when the ON button is pressed.
it's two different circuits. the "ON" button will momentarily place a resistance between two of the 'clockspring' connections, (the LB/BK and YE/LG wires) which will signal the Cruise Control module to turn on. Once that module is on, the rest of the switches (on the other circuit) become active (or, more correctly, become actively monitored in order to signal the Cruise Control module).

Quote:
Originally Posted by sheltonfilms View Post
Now if the wire went from the resistor to the "cruise control ground", that would make perfect sense. 1000k -ON, 2200-RESUME, 680-SET/ACCEL, 120-CANCEL, and 0-OFF. Is this just some sort of "typo"?
You are misreading or misunderstanding the functionality. Those are all momentary switches, not on/off switches. The CCM (I'm tired of writing out Cruise Control Module, haha) monitors the voltage on that control line, and when it senses a (momentary) change, invokes the appropriate function.
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Last edited by turbo; 10-21-2010 at 02:59 PM.
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  #7  
Old 10-21-2010, 07:03 PM
sheltonfilms sheltonfilms is offline
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Default Re: What does the ON switch do for Cruise Control

Still not making sense. How does the servo/module sense the resistance of the ON switch? The two wires that this resistor bridges is a Hot wire for the horns and the CC signal wire. If there is current flowing through the YE/LG wire, then the horn would sound, because of the flow of current through the relay.
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  #8  
Old 10-21-2010, 07:07 PM
sgtsandman sgtsandman is offline
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Default Re: What does the ON switch do for Cruise Control

I think he is saying the CCM is always on, the switch just "wakes" it up.
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Old 10-21-2010, 08:07 PM
rwenzing rwenzing is offline
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Default Re: What does the ON switch do for Cruise Control

Quote:
Originally Posted by sheltonfilms View Post
If there is current flowing through the YE/LG wire, then the horn would sound, because of the flow of current through the relay.
Because of the 1000 ohm resistor in series with the stepping resistor in the Speed Control Servo/Amplifier, the current through the horn relay from fuse 11 is not sufficient to pull the relay contacts and sound the horn.
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  #10  
Old 10-21-2010, 08:47 PM
sheltonfilms sheltonfilms is offline
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Default Re: What does the ON switch do for Cruise Control

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Originally Posted by rwenzing View Post
Because of the 1000 ohm resistor in series with the stepping resistor in the Speed Control Servo/Amplifier, the current through the horn relay from fuse 11 is not sufficient to pull the relay contacts and sound the horn.
Ahhhh.....with just the 1k resistor the current would be 12mA (less with internal resistance of the servo, like you said). I've heard that most 12V relays need around 30mA to power the coil, so what you're saying makes sense.

Just seems like a weird way of wiring the system up.
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  #11  
Old 10-21-2010, 09:53 PM
vapiper vapiper is offline
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Default Re: What does the ON switch do for Cruise Control

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Originally Posted by 01_ranger_4x4 View Post
it turns on your cruise control.


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  #12  
Old 10-22-2010, 04:22 AM
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Default Re: What does the ON switch do for Cruise Control

^^ lol
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  #13  
Old 10-22-2010, 06:41 AM
rwenzing rwenzing is offline
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Default Re: What does the ON switch do for Cruise Control

Quote:
Originally Posted by sheltonfilms View Post
Just seems like a weird way of wiring the system up.
Weird but clever. It's all about minimizing the number of conductor traces on the clockspring ribbon. By doing it this way, one trace serves two functions.
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  #14  
Old 10-22-2010, 11:14 AM
sheltonfilms sheltonfilms is offline
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Default Re: What does the ON switch do for Cruise Control

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Originally Posted by rwenzing View Post
Weird but clever. It's all about minimizing the number of conductor traces on the clockspring ribbon. By doing it this way, one trace serves two functions.
Why wouldn't they just use the same wires for the ON switch as the other switches? Each switch has a different resistance. Even the OFF button uses the other wires.
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  #15  
Old 10-22-2010, 11:19 AM
dixie_boysles dixie_boysles is offline
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Default Re: What does the ON switch do for Cruise Control

i dont understand, who sits and thinks of this stuff!? its a cruise control switch, it does what it is supposed to do, as long as it works, its fine...lol
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