Reply With Quoteabout 20 minutes-30 min. neg so it dont send a surge to all the electronic componants.
Major Contributor
Resetting by disconnecting
In resetting the ECU by disconnecting the battery, how long do I really need to wait? Some say 5 mins, some say 40 mins. And, do I really need to disconnect the negative connector? What if I just disconnect the positive connector? By logic it should be the same, no circuit no current to memory.
1994 520i with M50 engine, manual transmission and air conditioner.
VIN: GG45422
Green Beret Special Ops
about 20 minutes-30 min. neg so it dont send a surge to all the electronic componants.
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
Grand Master
Plus, you can disconnect the negative without lifting the back seat out.
www.KaRealtySF.com
Build Date: 05-1995 /Engine: m50tu /Automatic Transmission /ABS /NO ASC /Open Differential /EAT Chip
Major Contributor
Well actually it is easier to disconnect the positive, at least in my car. It is closer to the door. I have to lift the seat anyway.
Why disconnecting a negative would not cause a surge while disconnecting a positive might cause a surge?
1994 520i with M50 engine, manual transmission and air conditioner.
VIN: GG45422
Major Contributor
uhhh...are you aware that there is a negative battery cable quick-disconnect location where you don't have to lift the seat? The negative battery cable disconnect wire is located under the plastic thingy right in front of the battery on the riser that the rear seat sits on. See attached images below...you remove the outer cover 1st, then the inner protective cover, then the disconnect wire:
(outer cover...inner cover...negative quick-disconnect cable)
Last edited by Qsilver7; 06-28-2006 at 09:45 AM.
Q
95 525iT / 97 740iL
4 Grand Master
I've seen that cover many times on many cars and never thought about it.
I'm embarrassed to admit how many times I've removed the rear seat cushions on old 750s to disc. the battery so it wouldn't go flat while sitting for long periods.
I should have known there was a better way.
"The gas pedal wouldn't go to the floor if it weren't meant to be there"
3 Grand Master
Very good to know! Thanks for that tidbit.
Originally Posted by Qsilver7
uhhh...are you aware that there is a negative battery cable quick-disconnect location where you don't have to lift the seat? The negative battery cable disconnect wire is located under the plastic thingy right in front of the battery on the riser that the rear seat sits on. See attached images below...you remove the outer cover 1st, then the inner protective cover, then the disconnect wire:
(outer cover...inner cover...negative quick-disconnect cable)
Major Contributor
same here. Had no idea there was another way of doing that! Thanks.
1994 520i with M50 engine, manual transmission and air conditioner.
VIN: GG45422
Grand Master
i just pop open the E-box, and yank the ECU out!
Big, Big Time Poster
Wow so that is why I blew my obc's lights when i hooked up my radio. I wish I would have known about the plate and the neg first
Corey Horton
1992 BMW 535i
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