change ecu, ews and key chip

[bloomers76]

Hi there i've got a problem i need to change my ecu and ews unit on my 318is and i'm not sure were to locate both units and do i have to disconnect the battery first?

Any help would bb great, thanks.

[96_323]

ECU is in the engine bay behind the sound deadner on the fire wall. Just follow the big bundle of cables to it. I can't really remember but i think its on the drivers side.
EWS is stuffed somewhere in behind the steering wheel. Again, just follow the wires from the ignition back. There will be a good few wires but only 2 of them will lead back to a box located near the steering wheel.
Do you have a new ECU or are you having it remapped?

[bloomers76]

thanks for your help,
i'm replacing my ecu with another one from a breakers because i have a running problem and was told by an auto electrician that it is the ecu at fault and i thought it would be easier and cheaper (£40 plus vat) to replace all the units rather than getting just the ecu and getting it recoded for my existing ews unit.