Cruise control

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90hurst/oldsguy

Greasemonkey
Jan 31, 2013
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So I finally have gotten chance to hook up my cruise control to my bbo and have grounded the speed sensor. I still do not have any luck with the cruise. Does anyone have an idea of what I coulf be going on? Yes I have the vacuum lines ran and hooked up but nothing happens
 

ELCAM

Royal Smart Person
Jun 19, 2021
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How much vacuum do you have?

Resume or non resume transducer?

What color is the Transducer? Was it a diesel or Vacuum pump equipped car? Are all the terminals on the transducer vertical or is one horizontal and the rest vertical?

Did you check the fuse and see if there is +12V at the cruise switch?

RESUME PG 05.jpg


Cruise NR pg14.jpg
 
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90hurst/oldsguy

Greasemonkey
Jan 31, 2013
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It's a non transducer car it has the k34 option and it has plenty on vacuum . I'm running power brake .yes there is 12v at the cruise switch
 

69hurstolds

Geezer
Supporting Member
Jan 2, 2006
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K34 is 84-up. It always helps to know what year and make/model you're working on. MOST of the time, it's either the switch in the stalk, or the actuator (servo) itself gets toasted and nothing works. It also could be a misadjusted/leaky vacuum release switch under the dash as well. DOUBTFUL it's the speed buffer or cruise control module under the dash, as those are pretty hearty units, but never say never.

Couple of years ago I posted a GM K34 Cruise Control "Service Manual" dated 8/83 of sorts. It has troubleshooting tips in there. Download it here:


Here's a schematic page from it that's applicable to G-body-

1672584724964.png
 
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90hurst/oldsguy

Greasemonkey
Jan 31, 2013
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It's the 84 Hurst Olds! It's almost like my servo plug doesn't have any power to it . I have tested with multimeter and have nothing . I have never seen a fuse for the cruise on this car
 

MrSony

Geezer
Nov 15, 2014
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Des Moines, Iowa
I grounded a black/white wire that went to the computer and hooked everything back up as it was. I've got an 85 regal with originally the 231/th200c. Mine works fine.
 

69hurstolds

Geezer
Supporting Member
Jan 2, 2006
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Cruise connector (and power trunk release if equipped) comes from the IGN3 circuit plug on the fusebox. It gets its power from the A/C 25A fuse. If you're A/C and heater and junk work, then that likely won't be a fuse issue. Feeds the blue wire to the switch. If you're getting power there, the fuse is good. If the cruise switch is ON, then you should be getting 12v out of the green wire which goes to the brake switch, which turns into a gray wire where the switch plug attaches. Another gray wire taps off of that and powers up the cruise module at pin input A. Out of the brake switch it's a brown/white stripe wire to the cruise module to pin input G. With the brake off, you should be getting 12v out of the brown/white stripe wire too. If not, the switch could be misadjusted or faulty.

On the servo, disconnec the plug, measure ohms resistance across pins E and C, and A and C. Those should be 30-50 ohms each. Across terminal B and D, you should have between 15-50 ohms. Anything outside of that, then your solenoids inside the servo are probably hosed.

Do you have an electrical service manual? That will give you some insight on the cruise control.
 
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90hurst/oldsguy

Greasemonkey
Jan 31, 2013
145
6
18
Cruise connector (and power trunk release if equipped) comes from the IGN3 circuit plug on the fusebox. It gets its power from the A/C 25A fuse. If you're A/C and heater and junk work, then that likely won't be a fuse issue. Feeds the blue wire to the switch. If you're getting power there, the fuse is good. If the cruise switch is ON, then you should be getting 12v out of the green wire which goes to the brake switch, which turns into a gray wire where the switch plug attaches. Another gray wire taps off of that and powers up the cruise module at pin input A. Out of the brake switch it's a brown/white stripe wire to the cruise module to pin input G. With the brake off, you should be getting 12v out of the brown/white stripe wire too. If not, the switch could be misadjusted or faulty.

On the servo, disconnec the plug, measure ohms resistance across pins E and C, and A and C. Those should be 30-50 ohms each. Across terminal B and D, you should have between 15-50 ohms. Anything outside of that, then your solenoids inside the servo are probably hosed.

Do you have an electrical service manual? That will give you some insight on the cruise control.
I have tested the servo and no resistance across terminal b and d. I have voltage to all the 12v wires just don't have any power to the servo plug. I'm baffled at this point on the servo plug
 
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