Turn the key and i get NOTHING, no sound no lights no motor click. my batt is full please help
Not a BMW expert but had this same problem, it has to be very near the battery, best advice is follow the 12 volts out and look first for a bad cable (positive is more common but neg can do it) that is broken inside, In my case it was right where the Pos cable came off the battery, 2 inches away at T junction where the cable splits and there were two cables ---voltage the battery and not four inches to the left of it.
A volt meter will save a lot of time.
SOURCE: diagram for serpentine belt for 2002 BMW 525i
An image of a serpentine belt, hope this will help you,
Eitan.
SOURCE: 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.
SOURCE: 2003 BMW 325i - Car won't start. It will crank the (rrr rrr rrr)
Get a DTC scanner and see what it says...in the meantime, check that fuel pump relay and fuel pump. The humming sound is probably the heater blower motor or part of the HVAC system winding down after disconnecting from power.
SOURCE: My 2004 BMW 525i won't start (no clicking, slight humm)
starter motor solenoid problem by the sounds of it, check the connections are clean and secure, give it a tap with a soft head mallet or hammer handle. If it doesn't spring back into life it will need replacing.
SOURCE: 1995 BMW 325I WONT START NO CLICK NOTHING ONLY
in not the batery and starter the securyty sistem activad is not signal to the stater from ews ii to starter
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