Battery replacement

Post Mon Jan 30, 2006 9:34 pm

Right im fairly sure i know the answer to this but i thought i'd check, looks like the cold snap has killed my battery so whilst at work today i thought i'd look up a new battery.

in the notes section, it states "vehicles with on board computer will need system reset by bmw for vehicle to start"

Is this whats commonly know as bo**ocks?

Post Mon Jan 30, 2006 9:42 pm

never heard of that mate

Post Mon Jan 30, 2006 9:44 pm

yeah i thought the same mate. best to check before i rip the old one off!

i have heard of it on newer 5/7 series but not e30's

Post Sun Feb 05, 2006 8:27 am

not bollocks - what they mean is if you have the code function enabled on the OBC, if you disconnect/reconnect the battery (like a thief might) the OBC might decide that it is being stolen, and stop the fuel pump from working.

If you don't have the code function set, it shouldn't be a problem...

ps IMHO Bosch Silver is the battery of Kings

Post Sun Feb 05, 2006 10:48 am

I've seen OBCs (and other computer typr equipment) become thouroughly confused by the pulsing low voltage when trying to start a car with a duff battery, but nothing that can't be sorted by dissconnecting the battery for a short while.

Post Sun Feb 05, 2006 11:04 am

cheers people. i changed the battery last week and it was fine. i dont have an obc so maybe thats why i had no problems.

Thought it was best to check, rather than coming back here saying "i have just replaced my battery and now it wont start!"

Thanks again