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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Also, I am using a GPS speedo, if this has anything to do with the issue.
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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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Yes I do have Led Tail lights.
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These guys are probably right about the LED tail lights. I'll add that the GM PCMs are not quite as picky about low resistance and don't have to have the resistor packs.
Stop at your local Radio Shack and pick up a pack of 1K ohm 1/2 watt resistors. There will be 5 of them in the pack, but you just need 1. I find it easiest to place it at the tail light but you can place it near the brake switch if you prefer. It just needs to be connected from the ground wire to the brake signal wire. The resistor is not polarized, so which lead is which doesn't matter. The 1K ohm resistor won't even pull 1/4 watt, so it'll be cool to the touch unlike a spare bulb or resistor pack. |
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I will give it a shot hopefully this afternoon.
Thanks for the info guys. |
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I am not going to be able to swap out the 1157 due to my led tail lights being wired in to my harness. (Repop taillight buckets)
I have some resistors left over from my swap. I used them for my tach to cut out some electrical noise. http://lt1swap.com/lsx_tach.htm Would they work? Also does this need to be one side or both tail lights? |
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Got the resistor in today. Put it on and am still not getting any response from my cruise.
I can hear my relays working when I move the switch. So I do not think my issue is there. Does the cruise need to be turned on in the tune? |
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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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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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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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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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I am going to drop by and have my tuner take a look at it with HP tuners.
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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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LED flasher wont help.
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If not, what size of resistor should I wire inline with the LEDs then? |
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http://www.the12volt.com/installbay/...asp?tid=130800 |
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You don't need to wire up the relay to act as a relay. You can use just the coil side of it wired to the cold side of the brake light switch and ground, the cruise will see it's ground through the coil and allow it to work. This is how I do mine and they work perfectly. I use micro relays, solder the wires to the terminals and tape it up in the harness. You can see a pic in my build thread post #122
http://ls1tech.com/forums/conversion...-c-10-a-7.html It's doing the same thing as a resistor, but they don't get as hot as a resistor can get. |
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