Thanks.
Bcm,ecm,pcm??????
Burning Brakes
Joined: Jan 2006
Posts: 1,226
Likes: 45
From: Castleton VA
Cruise-In VIII Veteran
FWIW, I recall the number was something like 17 computers -- but that's a fuzzy memory. During my Museum Delivery tour at the factory, several folks referred to the C6 as a computer on wheels. It's really more of a portable local area network!
Last edited by mneblett; Nov 17, 2007 at 10:08 PM.
Drifting
Joined: Jun 2005
Posts: 1,837
Likes: 4
Pretty much everything.
Most of the controls are really connected to the effectors (motors, etc) indirectly through the BCM. That sounds like a bass-akwards way of doing things, but there are some real advantages. By using small wire to carry signals (bigger, heavier wire is required to carry power) they save weight - probably around 100 lbs on the C6. Because the computer can check the inputs against the outputs, it spots problems early. And because it can report on problems there's a self-diagnostic capability, making it quicker (and cheaper) to fix a problem (most of the time).
But a network on wheels is a pretty good description. The ECM, TCM, BCM, CCM, and various terminals all communicate through the on-board networks.
The part that annoys me is that they do so little with it. There are almost unlimited possibilities available at almost no cost, because everything is under software control. Adding a few lines of code and some options is cheap, reliable and easy. What's lacking is the documentation to support this sort of stuff.
Most of the controls are really connected to the effectors (motors, etc) indirectly through the BCM. That sounds like a bass-akwards way of doing things, but there are some real advantages. By using small wire to carry signals (bigger, heavier wire is required to carry power) they save weight - probably around 100 lbs on the C6. Because the computer can check the inputs against the outputs, it spots problems early. And because it can report on problems there's a self-diagnostic capability, making it quicker (and cheaper) to fix a problem (most of the time).
But a network on wheels is a pretty good description. The ECM, TCM, BCM, CCM, and various terminals all communicate through the on-board networks.
The part that annoys me is that they do so little with it. There are almost unlimited possibilities available at almost no cost, because everything is under software control. Adding a few lines of code and some options is cheap, reliable and easy. What's lacking is the documentation to support this sort of stuff.
Thread Starter
Team Owner
Joined: Dec 2003
Posts: 57,408
Likes: 164
From: queensbury ny
Pretty much everything.
Most of the controls are really connected to the effectors (motors, etc) indirectly through the BCM. That sounds like a bass-akwards way of doing things, but there are some real advantages. By using small wire to carry signals (bigger, heavier wire is required to carry power) they save weight - probably around 100 lbs on the C6. Because the computer can check the inputs against the outputs, it spots problems early. And because it can report on problems there's a self-diagnostic capability, making it quicker (and cheaper) to fix a problem (most of the time).
But a network on wheels is a pretty good description. The ECM, TCM, BCM, CCM, and various terminals all communicate through the on-board networks.
The part that annoys me is that they do so little with it. There are almost unlimited possibilities available at almost no cost, because everything is under software control. Adding a few lines of code and some options is cheap, reliable and easy. What's lacking is the documentation to support this sort of stuff.
Most of the controls are really connected to the effectors (motors, etc) indirectly through the BCM. That sounds like a bass-akwards way of doing things, but there are some real advantages. By using small wire to carry signals (bigger, heavier wire is required to carry power) they save weight - probably around 100 lbs on the C6. Because the computer can check the inputs against the outputs, it spots problems early. And because it can report on problems there's a self-diagnostic capability, making it quicker (and cheaper) to fix a problem (most of the time).
But a network on wheels is a pretty good description. The ECM, TCM, BCM, CCM, and various terminals all communicate through the on-board networks.
The part that annoys me is that they do so little with it. There are almost unlimited possibilities available at almost no cost, because everything is under software control. Adding a few lines of code and some options is cheap, reliable and easy. What's lacking is the documentation to support this sort of stuff.
Pro
Joined: Mar 2006
Posts: 658
Likes: 0
From: Pa
Pretty much everything.
Most of the controls are really connected to the effectors (motors, etc) indirectly through the BCM. That sounds like a bass-akwards way of doing things, but there are some real advantages. By using small wire to carry signals (bigger, heavier wire is required to carry power) they save weight - probably around 100 lbs on the C6. Because the computer can check the inputs against the outputs, it spots problems early. And because it can report on problems there's a self-diagnostic capability, making it quicker (and cheaper) to fix a problem (most of the time).
But a network on wheels is a pretty good description. The ECM, TCM, BCM, CCM, and various terminals all communicate through the on-board networks.
The part that annoys me is that they do so little with it. There are almost unlimited possibilities available at almost no cost, because everything is under software control. Adding a few lines of code and some options is cheap, reliable and easy. What's lacking is the documentation to support this sort of stuff.
Most of the controls are really connected to the effectors (motors, etc) indirectly through the BCM. That sounds like a bass-akwards way of doing things, but there are some real advantages. By using small wire to carry signals (bigger, heavier wire is required to carry power) they save weight - probably around 100 lbs on the C6. Because the computer can check the inputs against the outputs, it spots problems early. And because it can report on problems there's a self-diagnostic capability, making it quicker (and cheaper) to fix a problem (most of the time).
But a network on wheels is a pretty good description. The ECM, TCM, BCM, CCM, and various terminals all communicate through the on-board networks.
The part that annoys me is that they do so little with it. There are almost unlimited possibilities available at almost no cost, because everything is under software control. Adding a few lines of code and some options is cheap, reliable and easy. What's lacking is the documentation to support this sort of stuff.
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Cruising
Joined: Jun 2007
Posts: 12
Likes: 0
From: Centreville VA
my CC also quit
have a 6-month old C6/A6/Z51 w/4800miles. when the CC quit, i took it into MY dealer, asking for an accompanying road ride to confirm it was not working. dealer said to bring it back next bus. day if still not working. brought it in next bus. day as requested. they said they wanted to take it in for a bench ck, to be foll. by the road test, and did not inquire as to whether it was working when i drove it in. i stupidly agreed to let them ck it in the garage before a road test; guess what: after they did their bench magic, they took me out on the road, showed me the CC was working fine, and was wondering if i had "forgotten to wait until it had achieved min. speed [30mph!!??]" or some other stupid point. so basically, they "got away with one" and i have to wait for it to happen again to try to get confirmation and more serious response from Mr. goodrench. so, if the condition is waiting to happen again, i have wound up with time wasted and my intelligence insulted, to boot.
Cruising
Joined: Jun 2007
Posts: 12
Likes: 0
From: Centreville VA
in addition to cc, other gremlins have appeared
after leaving the dealer with my cc working, next day i take it out on the road and the DIC starts hitting me w/strange messages, i.e.,
"check gas filler cap"
"check windshield washer fluid"
then later that day, the lites in the mirror-map/footwell came on by themselves; then later the dashboard instrument lites came on at full brightness.
the only thing like that before was a couple mos. ago, when the dash suddenly went dark. i am just logging everything for now, i called detroit/chevy and asked them to open a trouble ticket, which they did. i told them i intend to keep a running log of these electrical/'puter problems and will get back to them soon [i got their direct phone number and the open trouble ticket number].
one of my club's gearheads said it might be a dirty electrical junction part, or an EEPROM. apparently the wire control junction parts are cheap and can get dirty electrical connections, even at the factory.
stay tuned.
"check gas filler cap"
"check windshield washer fluid"
then later that day, the lites in the mirror-map/footwell came on by themselves; then later the dashboard instrument lites came on at full brightness.
the only thing like that before was a couple mos. ago, when the dash suddenly went dark. i am just logging everything for now, i called detroit/chevy and asked them to open a trouble ticket, which they did. i told them i intend to keep a running log of these electrical/'puter problems and will get back to them soon [i got their direct phone number and the open trouble ticket number].
one of my club's gearheads said it might be a dirty electrical junction part, or an EEPROM. apparently the wire control junction parts are cheap and can get dirty electrical connections, even at the factory.
stay tuned.
