poughkeepsie

I went to take my 05 base to a car show this morning. I tried to put up the driver window but it wouldn't move. I could hear a click in the door and it would only move like a 1/4" and stop. I could go back and forth that 1/4" but no more than that. Almost as if it learned the index at the bottom. Played with it for a few more mins and still nothing. Disconnected and reconnected battery and still no change. Disconnected battery again and touched terminals together. All was working right again after that. Just a heads up if anyone else runs into this issue

CadVette

Think of it as the same thing as rebooting your computer. Your Vette is uses computer controlled modules and they need to communicate properly with the PCM/BCM. If the signal is locked up disconnecting the battery and touching the cables reboots the system.

LMB-Z

You can't just disconnect, then re-connect the battery cables. You need to let it sit for several minutes with no power. Why? I don't have a clue. There are many, many threads on this. Some say 5 minutes, some say 1 minute, some say 30 minutes. I personally have used the 5 minute method and has worked for me. I guess maybe things need time to power down. Anyway, glad it worked for you.

Not So Fast

Same thing I was told with electronics.\, DVD player, cable box ect. except the guy said to push or turn on the "power button" and hold it for a few seconds, like 10-15 after unplugging it from power, why I asked, don't know but he said to do it. Maybe it releases stored energy Worked
NSF

Bruze

1) I had always wondered about rebooting your modem: You're supposed to shut it off and wait 10 seconds before turning it back on. But . . .

If the speed of electricity approaches the speed of light (186,000 miles per second) how long should it take to go from the "Off" switch on the modem to all the components, inches away? A zillionth of a trillionth of a second? Certainly not ten seconds.

Then someone told me that the capacitors (condensers) have to discharge. Okay, sounds reasonable.

2) This thread is the first time I've ever heard anyone mentioning touching the two battery leads together.

poughkeepsie

Touching the leads together discharges any capacitors.

Bruze

Aha, so someone could discharge them instantly instead of waiting a while.

jft69z

It's typically called a 'global reset' by techs. Used it a number of times on vehicles over the years to fix flaky behavior, not just GM either. It's always worth a shot before replacing modules, or where scan tool data doesn't reveal anything solid. Can't beat the cost

FortMorganAl

That because disconnecting the battery has nothing to do with "rebooting" modules. All modules are reset either by the BCM or through timers. While you are connecting and disconnecting and shorting and eating carrots, the timers are running. Suddenly eating that last carrot caused the module to reset.

Yes, many electronic devices have capacitors to solve issues with voltage fluctuations and they will continue to supply enough power to keep a device running through short power interruptions. The C6 is not one of these. It has a 12V battery and permanent memory that needs no power to pick up where it left off if the battery is disconnected. Ever notice that you can't reset codes in a C6 by disconnecting the battery? Ever wonder why?

Bruze

I've heard you say that before, and trust your opinions.

- So why does disconnecting the battery reset the radio presets (and a few other things?) as happened to me a couple of years ago?

- What's the deal about touching both battery leads together after they are free from the battery? (as mentioned by the OP) Does it accomplish anything?

ruxvette

What's the speed of dark?

wayback

Not fast enough......you have had your photo taken.

EVRose

I've had my battery disconnected several times and have never lost any memory presets. Not even the clock. Only thing I've ever had to do is reset the windows.

Bruze

Me neither.

I should have 'splained my point better.

Two years ago when I took mine out of storage (stays on maintainer continuously) the radio presents were in total chaos. Maybe a few other things too, don't remember. I asked here, and someone (maybe Al? or Dano?) said to disconnect the battery, which I did, and they were okay after that and have remained fine since.

(Ha, but this spring the mirror presets were off the wall, so I just did the reset with button #1 on the door thingy.)

ByByBMW

Maybe the presets aren't supposed to get lost but they have on my C6's when I've disconnected the battery. It's why some folks use the battery in the lighter tool when they fuss with the battery.

FortMorganAl

That's something Dano would say, not me. The only memory on the car that isn't permanent is the window full up position. Yes, if you disconnect that battery long enough the clock may eventually stop. I'm not sure what powers the clock with no battery. Sounds more like you had a power surge sometime over the winter.

I have an issue with the nav on my car. If I drive past this one particular hospital under navigation and also listening to an MP3 CD at the same time, the nav stops updating. The CD still plays but the map never changes again and no more directions. I suppose I could disconnect the battery to reset it but that would mean stopping the car and getting out to do it. The solution is to stop the car and open the driver's door. When I close the door and restart everything is back to normal because it was the BCM removing power when the door was opened in RAP mode that actually solved the problem. If I had not opened the door power would have been removed in 20 minutes anyway. But if I had gone through the effort of disconnecting the battery, not knowing how it worked, I might say that disconnecting solved the issue. This is very similar to the misinformation that the car unlocks when the FOB gets close and locks when the FOB moves far enough away. Makes sense but it totally wrong.

And the reason I keep harping on the issue is that every time you disconnect and reconnect the battery you put power surges into the electronics. Sure the system is designed to not fail with every surge but you are playing Russian Roulette with your computers. And if you don't need to...