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#1 |
Registered User
Join Date: Feb 2003
Location: Paragould, Ar
Posts: 571
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DBW Cruise Issue
I installed a cruise control setup today on my 70 gmc and it will not activate.
I used the parts and method in this post by ACKATTACK. http://67-72chevytrucks.com/vboard/s...d.php?t=398006 I checked all the relays and they are working as shown in the above thread. I double checked my wiring from the TAC module as well. It will not turn on (I can hear the relays though) or respond in any way. Any ideas for what I need to look for?
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1970 Gmc Grande Sierra Swb 2wd LSX (LQ4/4L80e) 1990 K1500 Daily ![]() |
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#2 |
Registered User
Join Date: Feb 2003
Location: Paragould, Ar
Posts: 571
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Re: DBW Cruise Issue
Also, I am using a GPS speedo, if this has anything to do with the issue.
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1970 Gmc Grande Sierra Swb 2wd LSX (LQ4/4L80e) 1990 K1500 Daily ![]() |
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#3 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: DBW Cruise Issue
Have you verified that you are getting a constant 12v at the 'on/' wire pin 14 on the TAC? Orher than that, make sure you have the brake switch adjusted properly.Also, make sure pin 6 is hooked to the brake light switch that is hot when the brakes are applied. You dont have LED tail lights do you?
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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#4 |
Registered User
Join Date: Feb 2003
Location: Paragould, Ar
Posts: 571
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Re: DBW Cruise Issue
Yes I do have Led Tail lights.
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1970 Gmc Grande Sierra Swb 2wd LSX (LQ4/4L80e) 1990 K1500 Daily ![]() |
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#5 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: DBW Cruise Issue
Try swapping them out for a pair of 1157's and see if it works. The cruise needs to see ground through the brake lights and LED's won't do it so it usually won't work. If that fixes it, you can add an extra 'artificial' load to the circuit to allow you to run the LED's.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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#6 | |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: DBW Cruise Issue
Quote:
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING ![]() |
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#7 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: DBW Cruise Issue
I think for all intensive purposes, the engine and computer don't care if the truck is in cruise, at least with GenIII engines. Its possible GENIV is different because of DOD's use in cruise, but other than that...its not like there's "cruise" setting or anything.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING ![]() |
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#8 |
Registered User
Join Date: Nov 2011
Location: Idaho
Posts: 857
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Re: DBW Cruise Issue
Double check the adjustment on that brake switch, I was stumped with mine and slowly backed the switch away from where it bottoms out and started working. Worth a try.
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#9 |
Registered User
Join Date: Aug 2013
Location: Tecumseh
Posts: 355
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Re: DBW Cruise Issue
Stop guessing without real data. You guys are funny. You throw suggestions out like popcorn. What's next, replace the gas cap?
OP, go find someone who has HP tuners, datalog what the inputs and outputs are doing and troubleshoot it logically with real data. Otherwise you are just guessing. In hpt, the satus bits will tell you if the switches are commanding cruise, brake pedal status to the PCM and it will also tell you if the output is enabled among other things.
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Current project 1959 Willys = GEZR TRUK Geezer is a Latin compound word made up of two roots. Gee meaning Urine Stain and Zer meaning your pants are open! FMCDH GBU and GBA http://www.youtube.com/user/aknovaman/videos |
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#10 |
Registered User
Join Date: Aug 2013
Location: Tecumseh
Posts: 355
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Re: DBW Cruise Issue
If you really want this thing to work, pm me your phone number and I can talk you through troubleshooting it over the phone with a simple voltmeter.
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Current project 1959 Willys = GEZR TRUK Geezer is a Latin compound word made up of two roots. Gee meaning Urine Stain and Zer meaning your pants are open! FMCDH GBU and GBA http://www.youtube.com/user/aknovaman/videos |
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#11 |
Registered User
Join Date: Feb 2003
Location: Paragould, Ar
Posts: 571
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Re: DBW Cruise Issue
I am going to drop by and have my tuner take a look at it with HP tuners.
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1970 Gmc Grande Sierra Swb 2wd LSX (LQ4/4L80e) 1990 K1500 Daily ![]() |
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#12 |
*************
![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Re: DBW Cruise Issue
Did you ever find a solution to this? Please post. TIA.
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#13 |
Addicted to Rust
![]() Join Date: Dec 2009
Location: Abbeville SC
Posts: 1,030
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Re: DBW Cruise Issue
I've always used a relay with LEDs and cruise.
LED Tail Lights Note The use of LED tail lights requires a five-function automotive relay to bypass the brake system. LED tail lights do not let the violet wire (cold side of the brake switch) see ground through the brake lights, themselves. Wiring in a relay is as follows: http://www.rostra.com/manuals/250-4382_Form5260.pdf
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Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public. |
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#14 | |
*************
![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Re: DBW Cruise Issue
Quote:
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#15 |
Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,750
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Re: DBW Cruise Issue
Following, maybe I will learn something!
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#16 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: DBW Cruise Issue
Make sure when you adjust the brake light switch that the tcc wire has power in and out without the brakes applied.
I had a problem.with the cruise not working. Turned out I had to push the pin in further. Into the barrel of the switch to make contact. Doing that I now have to push the brake pedal down further for the brake lights to come on
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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cruise, cruise control, dbw, lq4 |
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