Disconnecting Battery
Thread Starter
Drifting
Joined: May 1999
Posts: 1,795
Likes: 1
From: Chicago IL
Disconnecting Battery
I wanted to clear out my pcm and I disconnected the "B+" connection next to the fuse box. Does this remove power to the PCM? OR should I disconnect directly from the battery terminal? I noticed no power when I just disconnected from the fuse box. However, I noticed all my radio settings are still there....
THNKS
THNKS
Race Director
Joined: Jun 1999
Posts: 10,753
Likes: 0
From: Dallas TX
Elite Member
Cruise-In I Veteran
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Re: Disconnecting Battery (sbkim)
Take off the negative battery cable carefully and let sit to put all computers to 'sleep'.:)
RG
RG
Thread Starter
Drifting
Joined: May 1999
Posts: 1,795
Likes: 1
From: Chicago IL
Re: Disconnecting Battery (RG in Dallas)
RG,
Thanks. Looks like taking off just the B+ terminal may do the trick. I did the idle relearn and etc. and I am now noticing a noticeable difference in power. I just recently had my PL reprogrammed and for the last few days, my car wasn't running too hot. So, I decided to reset the PCM. Now, my car is running very strong. Some may be pschological but you can't negate the rubber burning performance.
Thanks. Looks like taking off just the B+ terminal may do the trick. I did the idle relearn and etc. and I am now noticing a noticeable difference in power. I just recently had my PL reprogrammed and for the last few days, my car wasn't running too hot. So, I decided to reset the PCM. Now, my car is running very strong. Some may be pschological but you can't negate the rubber burning performance.
Racer
Joined: Feb 2001
Posts: 298
Likes: 1
From: San Antonio Texas
Re: Disconnecting Battery (sbkim)
According to my dealer, the best way to "clear" the computers is to disconnect both battery cables, then touch the ends together for about 15 seconds. Then, you can reinstall the cables and off you go. It sounds wierd and I was very skeptical when I was told this:rolleyes:
Apparently, they(dealer) had problems clearing things out fully (fobs not working right, etc.) and GM Tech told them to do this. It actually worked on my car.
Apparently, they(dealer) had problems clearing things out fully (fobs not working right, etc.) and GM Tech told them to do this. It actually worked on my car.
Racer
Joined: Feb 2001
Posts: 298
Likes: 1
From: San Antonio Texas
Re: Disconnecting Battery (sbkim)
Both cables are disconnected from the battery; there is no battery power going anywhere so fuses, etc. are safe. The only thing I can think of that this would do is clear out the charges in any capacitors in the electronics. Maybe this is what makes the difference.
I can report that it has been done on my car twice with no ill effects.
I can report that it has been done on my car twice with no ill effects.
Thread Starter
Drifting
Joined: May 1999
Posts: 1,795
Likes: 1
From: Chicago IL
Re: Disconnecting Battery (fairway)
fairway,
I sent you an email about a week ago re. headers. Did you get my email. Drop me an email at sbkim@yahoo.com I may be meeting up with another C5 owner this Friday. I think he will be dynoing his car with LS6 intake. I will let you know.
I sent you an email about a week ago re. headers. Did you get my email. Drop me an email at sbkim@yahoo.com I may be meeting up with another C5 owner this Friday. I think he will be dynoing his car with LS6 intake. I will let you know.
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Drifting
Joined: Dec 2000
Posts: 1,296
Likes: 0
From: Warminster PA
Cruise-In IV Veteran
St. Jude Donor '03-'06-'08-'10-'11
Re: Disconnecting Battery (sbkim)
If you are shorting the 2 battery connectors together to clear out capacitors, do so at your own risk. When you work on an electrical outlet in your home, do you stick a coat hanger in the 2 prongs to pop the breaker also? This is basically what you're doing to these capacitors and creating a quick current rush.
I would disconnect the negative battery terminal and wait. If you need capacitors storing memory functions to discharge, you should wait it out.
I would disconnect the negative battery terminal and wait. If you need capacitors storing memory functions to discharge, you should wait it out.
Instructor
Joined: Oct 2001
Posts: 144
Likes: 0
From: Montreal Quebec
Re: Disconnecting Battery (sbkim)
Shorting the ground and B+ cables together should solve the problem. There is no danger in doing this, trust me. We are experts in the field of vehicle wiring. We do that for a living. In fact, when you need to do a Passlock reset on some pre 97 GM vehicles, this is usually one of the tricks you would use. No way is there any potential for a short to occur there, capacitors or not. Just make sure that you don't have any aftermarket security system with a backup battery attached, that could be a problem. The other thing you can try is to disconnect ground ffrom the battery and turn the ignition key to cranck for 10 seconds, reconnect and it should be fine. But hey, don't trust me, go visit our site to check out our credentials. http://www.wiremagic.com
[Modified by Straightpipes 1HD, 11:21 PM 10/16/2001] :smash: :smash:
[Modified by Straightpipes 1HD, 11:25 PM 10/16/2001]
[Modified by Straightpipes 1HD, 11:21 PM 10/16/2001] :smash: :smash:
[Modified by Straightpipes 1HD, 11:25 PM 10/16/2001]
Burning Brakes
Joined: Nov 2000
Posts: 832
Likes: 0
From: Joplin Mo
Re: Disconnecting Battery (Straightpipes 1HD)
I agree. Having worked in the electronics field for years, I can assure you that touching battery cables together without them hooked to the battery will do no harm. You're just speeding up the process of the caps in the electronic circuits to drain much quicker. Its like working on a TV. The flyback circuit has a high voltage capacitor that you have to short out before you can work on the TV. When you short it out, it creates one hell of an arc! Even with this arc, it doesn't affect any of the sensitive electronics in the TV. In a car, you're only dealing with low voltage stuff. Actually, I can't believe I didn't think of this myself (shorting out the terminal wires) to clear the computers. Makes perfect sense. :yesnod:
