Question about BMW 335

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May have fried bmw computer chip, how do I know?

Someone got a jump off me the other day and convinced me that it is ok to us the positive terminal only for my vehicle to power his (the one that is in the engine section not near the battery). A few days later dash warnings for ABS and Steering and Check engine began flashing erratically and then the car died (also the radio goes off). It has happened the last few times I have attempted to drive the car. It makes the car stall. I have checked all the connections, the fuses, wires for exposed parts, and I have disconnected the battery for an hour only to find now it doesn't even crank only all the lights continue to work.

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Some BMW's have a chip in the battery cable that can go kaput. I've never had to replace one but I'm told they cost around $800 coconuts. When we see jumper cables in BMW's we tell the owner to never use them. These cars are like little rolling space shuttles. The very least you will probably need is a computer relearn/flash/coding/regeristering. Even when changing battries use a BMW batt white case or black which ever came out, Then get it "registered" or you're car'll be confused. I wouldn't ever recommend aftermarket electronics either unless the installer is trained to install units in BMW's.

Posted on Mar 29, 2010

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I would have the battery tested.... and the charging system as well

Posted on Jan 12, 2009

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second,
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then o the other end where there is a good battery, start the car , now put the black clip to the negative terminal of the battery and then put the red clip to the positive terminal.
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let it be for about 15-20 mins. you can rev up the running cars from time to time.

then after 2- min, you can start your car.

you will only fry your computer if there is a wrong lead on a wrong terminal so be very careful in choosing which terminal is positive and which is negative.

the positive terminal is marked with a plus sign "+ "
the negative terminal is marked with a minus sign " - "

tnx 4 using fixya,

drcool

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