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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 11-02-2005, 08:55 AM   #1 (permalink)
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ECU sleep mode

Hi all,

Newbie here. I have a 2002 330D and am having problems with the battery - wondered if anyone here could help. I'm not sure whether the battery has a problem or something is draining it, but the ECU sleep mode is making it difficult to tell if there is a drain or not.
When I meter the battery load, with the doors closed, car locket etc. it starts at 2.5A for about 30 secs, then goes down to 1.6A then down to a steady 0.8A after another 30 secs. Fairly sure the first loads are to do with the ECU performing checks but what about the 0.8A. I think this is too high but should I wait longer for the ECU to finish it's activity before trusting the reading a pulling fuses to see if anything is drawing excess current?

Thanks for any help,
Keith
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Old 11-02-2005, 12:01 PM   #2 (permalink)
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0.8 a is about 10watts. i think too much for electronic devices when car is shut off, but this is out of my league....
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Old 11-02-2005, 11:58 PM   #3 (permalink)
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If your car is the same as US spec car then 16 mins is the time limit for all of the busses to go to sleep. Wait 20 mins to be on the safe side then see what you have. 40mA is the spec, anything above that is excessive.
Good luck,
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