yep...bingo.
Poor (or disconnected) grounds can do some VERY peculiar/unexpected things in modern computerized vehicles. Many times they can even cause issues whose symptoms would point to a totally different source of the problem...
LBZ swap into LB7, now no door switches
- Thread starter Dudgy
- Start date
yep...bingo.
Poor (or disconnected) grounds can do some VERY peculiar/unexpected things in modern computerized vehicles. Many times they can even cause issues whose symptoms would point to a totally different source of the problem...
I had an 03 Tahoe that had a bad ground. Anytime you use the left turn signal the rear wiper would turn on and the Fog light indicator would flash :roflmao:
All is good now, windows fly up and down, doorlocks work, heated and memory seats work, mirrors work. Whoa i couldn't believe it, i would've never ever found the problem if i didn't plug the flashscan in to check codes. This is nuts, a freakin OBD2 ground like what the heck! Crazy electronics haha but i'm glad everything is working now.:thumb:
yep...bingo.
Poor (or disconnected) grounds can do some VERY peculiar/unexpected things in modern computerized vehicles. Many times they can even cause issues whose symptoms would point to a totally different source of the problem...
Ya like what does the OBD2 port have to do with the freakin doors, like seriously, whoever invented this electrical system in GM's was on crack lol:roflmao:
Actually its not a stupid setup/system at all........ It makes for a much more efficient electrical system, cuts down on the amount of wiring needed, reduces potential failure/trouble spots, and when you do have a problem, it makes it 10x easier to diagnose.....IF you have the proper tools such as a Tech 2, which is essential....and maybe why some people think its "stupid".
everything electrical in the truck is interconnected/networked on a common data bus. (like a computer network, the windows talk to the radio, HVAC, door modules, etc etc etc)
I cant remember the exact number of individual modules that all communicate with eachother on the databus in 03+ GM trucks/SUV's, but its somewhere around 15-20.
Think about it. If you had an electrical short or electrical problem with a "old style" non-integrated vehicle, where the hell do you start? You get out your multimeter and you spend HOURS tracing hundreds of wires, decoding schematics, blowing fuses, dealing with test lights, probing connectors, ripping apart harnesses only to have to re-wrap them with tape later, etc etc etc.
What do you do when you have an electrical problem in a 2003+ GM truck/SUV?? Plug in the Tech 2, check for codes in the affected module/zone, and then see what live data that module is reading out. That takes like 2 minutes tops. It literally makes it idiot proof and can narrow down the amount of wires that you have to manually trace down to 1 or 2.
the whole vehicle can be more efficient as a whole also. Because there really arent any more "key-on/ignition hot" power wires used anymore, (all of the modules just get constant battery + power, and then are told to 'wake up' and 'go to sleep' with a data message), that literally cuts out half the required +12volt wiring right there. And when individual modules arent needed, they can be discretely powered down without effecting any other modules in the truck...which takes load off the alternator and ultimately saves fuel.
Another example is the doors. You might have power windows, mirrors, locks, courtesy lights, heated seat controls, turn signals in the mirrors, power fold mirrors...........ok thats a lot of stuff to control. With just basic electrical power/ground circuits like older vehicles...that could easily be 30+ wires that all have to go from the body of the truck into the doors.
With a computer-networked electrical architecture, you literally need JUST THREE WIRES going from the body to the door to do all that above-mentioned crap. Power wire, ground wire, and data wire (which is the wire that carries the computer messages to/from the door to activate the mirrors, window, etc). Three wires!!!!
Ill take the "complicated" networked/computer-driven electrical system any day.
ben
How did you end up finding this? Did you get a code the V2 found or what? Curious how you ended up determining this without a Tech2.
I've got a full Denali interior for my standard cab, but kind of concerned at what problems I'm going to have swapping it over (2 less doors, no rear climate control, etc). I don't have a Tech2 and I'm wondering if I should buy one to add to my collection of tools.
I figured it out by accident lol. Plugged my flashscan in to clear codes and when I plugged that in it must've grounded thru the flashscan cuz then it worked. Unplug flashscan and it was screwed again. So I found wire diagram for obd2 port and put a wire on the chassis ground plug and grounded it and everything worked :thumb: