Question about BMW 525

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Battery 2003 BMW 525i

I changed the battery and still wont hold a charge then the whole car starts to shut down. First the DSC then ABS then brake light on then airbags then i get a transmission failsafe then an engine failsafe then whole CPU of car dies.

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Have the alternator checked by a shop that is qualified to work on your car.

Posted on Oct 06, 2009

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Put a scan tool on it and pull the codes. That is where you syart. Sounds like water got into the ecm.

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theres a problem with the abs, when the abs has a problem the brake and abs light come on, also dsc light does too, because it uses the abs to control the system so when abs doesnt work it shuts down the dsc and turns the light on, you will need to have the abs system scanned for codes these codes will give an idea of whats not working and it can be diagnosed why.

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Bmw 2003 325ci coupe... i have just replaced the battery and the battery light is still on is this another fault or a faulty battery. Also every now and then the Yellow warning light on the dash for the...


Hi Stuart, the battery light indicates that the alternator is not charging. The alternator needs to be repaired or replaced in the case where the alternator is the problem. Before replacing the alternator you might want to check your fuses. It might be that one of the main fuses blew, causing the alternator not to charge. The traction control light will come on if it detects a problem with the supply voltage to the control unit caused by the alternator not charging.

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BMW warning lights: BRAKE, ABS and DSC


i need anyone one to help me with this problem, i have a BMW328ci and i tried tyo get out of my house this morning and all roads were frozen and the car started sliping and i activated the dcs button and car was still slipering and then brake, ABS, CBC & DSC lights turned on and i need to know how i can reset these lights so they can come off

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2003 BMW 525i--could an improper jump start blow a fuse?


new altenator,sounds like you put the cables on the wrong way round

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Abs and dsc are related and with the light on these won't work. It is possible that you need to go back to where the work was done to look this over.

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It's not the fuse. You need to jump start the diagnostic cable. First you need a battery of 9v and short the + and - terminal to the diagnostic cable. Then you will see smoke. After that it should work fine.

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1 Answer

2003 bmw 525i


If the brake lights are really on (?) this represents about a 4-5 ampere drain that would drag down most batteries in less than a day. (Could be over 100 ampere/hours.)
I don't know your car but brake lights can be controlled by a switch operated by the pedal suspension or a pressure switch that monitors hydraulic pressure in the braking circuit.

If your brake lights are on, the switch that controls them has failed or a relay that is operated by the switch.

If the car seems sluggish or pulls when driven, it could be a failure in the ABS circuit since that is a high-demand (normally intermittant) load.

The best way to locate the problem would be to monitor the current drain with a meter in series from the battery (engine off, monitor the ground side) and pull and replace fuses one-by-one to see which circuit is the culprit.

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