my_galaxy

guys i need your help
iF I DISCONNECT ECU AND RECONNECT IT ON 2006 BMW 530I. would it resett whole car other than milage/.? is there any negative side effect to it?
thanks

acuteperformance

it's safe, you'll lose your radio stations, time settings, trip counter, but not your odometer

pauliehcfr

The ecu memory will not be erased. I forget what kind of memory it has, but it is similar to your home computer. If you unplug it, it doesn't lose all your data.

andyp

sometimes after this operation car will not start
bmw use two keys between cas and ecu. constant 2 bytes ID,
and rolling code (4 bytes). rolling codes are changed on
every run.

but you can simple repair it with inpa

my_galaxy

thanks guys after your help i am thinking of scanning it and resett the codes

BimmerJay

I see where you're going with this question. Every once and a while I do this trick to my Jeep.

Disconnect the battery by removing the positive battery cable. Ground the positive cable to the negative cable for 30 seconds to erase the electric charge in the capacitors. Reconnect the positive cable to the battery. Then some tricks with turning on and off the lights.

Sounds like the BMW's have a battery backup so the ECU never loses certain information. The nice thing about the Jeep is it forgets all driving habits. The Jeep remains in learning mode for the next 500 miles...

-Jay

jund

How do you reset the ecu? And what benefit would you get from doing this and what are the disadvantages if any? Thanks, I am just having problem with my central locking and maybe this may solve it.

Greenberg

isnt the same trick as the transmission reset! 25 seconds trick??? I dont know if it works I've tried it on my 525i Sport I see no diff Im a heavy footer...