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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 02-07-2011, 05:40 PM   #1 (permalink)
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Battery Disconnect Procedure

Hi to all, I would like to know if there is a step-by-step procedure when disconnecting the battery (negative terminal). Here's why I need to know. A 320i E90 owner complained that his vehicle would just die down after starting, or just would not start at all (key on, start button pressed). A technician from the local BMW dealership asked him if the "correct procedure" for disconnecting the battery was followed when service/repair was done on the vehicle. The technician claimed that if the key was left inserted when the battery was disconnected, this problem will sometimes happen and will manifest itself after several starts and runs. Is there any truth to this or is this technician taking him for a ride?
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