Question about BMW 335

2 Answers

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.

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

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

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 5,158 Answers

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

Posted on Jan 12, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do you give a jump start to someone using a 2007 Dodge Charger?

The underhood connections can work by themselves...POS to POS, and NEG to NEG...sometimes dirty/weak connections do not allow the power to transfer fully from the underhood connections...if this is the case then you need to connect directly to the battery in trunk for full power charge...again POS to POS, and NEG to NEG...hope this helps

Jun 09, 2015 | 2007 Dodge Charger SE

1 Answer

Jump startejump started but leads wrong way round!! Now starts then cuts out in 2 seconds! ANY ideas??

could be the immobilisor but not a lot of idea here sorry ,the positive terminal is always to the right and its the largest terminal ,well 99% of cars are positive to the right with terminals closest to you even if the battery is mounted with terminals away from you ,Anyway ave a funny feeling that you may need to find a car in the scrapyard and remove the computer with the transponder and the chip from the key .although you may be able to get the computer repaired cheap enough

Jan 06, 2013 | 1995 Audi A4 1.8

1 Answer

There is a bar holding my gas gauge down

the little black pin is to stop the needle going back dont think a jump start would cause that but if when you jump start and terminals are reversed polarity if could fry the battery cels

Aug 13, 2012 | 2006 Infiniti G35

1 Answer

How can I jump start my 535 diesel? The battery is in the back but I see there is a ve connection in the engine compartment. I don't know where to connect the negative lead and am scared of shorting...

You can jump to the battery or alternator or starter. All have a hot lead. Usual method is positive clamp to the battery "+" terminal and negative cable to a good ground point. This could be the "-" battery terminal, a place on the frame, or a ground point on the engine.

Aug 29, 2010 | 2008 BMW 535i Sedan

1 Answer

2001 bmw x5 when I try to start it the light flicker and makes a clicking noise. Is it just the battery

First check the battery terminals are clean and firmly attached- if terminals are ok the battery may be either discharged or faulty.
Get the engine started by jumping from another battery- then check battery running terminal voltage is approx 14.5 volts with load such as headlights or heater fan on.
If voltage ok and battery still doesn't hold charge, the battery is probably faulty - replacement required.

Oct 26, 2009 | 2002 BMW 5 Series

1 Answer

Jump Start Topside terminal Location735IL

There is a positive jumping point underneath the hood on the passenger side.

Feb 26, 2009 | 1988 BMW 7 Series

1 Answer

On board cmputer not working

sounds like a fried circuit board, did you bump anything with the positive clamp and did you put the ground clamp on first before the positive - if not you could have fried the board $$$$$$$$$$$$$$

Feb 05, 2009 | 2005 BMW X5

2 Answers


try replacing the alternator.

Nov 25, 2008 | 2001 Chrysler 300M

1 Answer

How do I get my battery to recharge?

two things.

you can remove your battery and have it charge somewhere else if you dont have a home charger or if you have a home charger, you can just hook up the red cable to the positive terminal of the battery and the black cable to the negative terminal.

if you have a jumper cable, these cables have a pair of black and red alligator clips, use them to connect another car's battery in parallel to yours.

use a pair in your battery, put the red one in your positive terminal and put the black one in the negative terminal. be careful that the other pair on the other end dose not touch with each other. somebody should be holding them apart.

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.
there should be a spark as you put the last red clip so be careful.

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,


Sep 13, 2008 | 2006 Chevrolet HHR

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

592 people viewed this question

Ask a Question

Usually answered in minutes!

Top BMW Experts

Anthony Jones
Anthony Jones

Level 2 Expert

128 Answers

Frankie B

Level 2 Expert

65 Answers


Level 2 Expert

254 Answers

Are you a BMW Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides