Question about 2002 BMW Z3

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Something is draining the battery on our 2002 bmw z3.the battery and alternator checks out good,what is draining the battery??

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Claude Kayser

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HELP 2000 Z3 Battery Drain - Bimmerfest - BMW Forums

www.bimmerfest.com > ... > Z Series > E36/7 Z3 (1996-2002)

Feb 18, 2007 - 7 posts - ‎6 authors
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More results from www.bimmerfest.com

Posted on Jan 18, 2016

  • chuck kanuupke May 07, 2020

    You may have phantom power draw. Also known as parasite power emitting from fuses. I tried numerous times to assess with fuse amp test unit. Finally bought trickle charger. Use it. Eliminates problem. BMW dealer told me there was no problem. Blamed bad battery.

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2 Answers

Something is draining the battery on our 2002 bmw z 3. The battery and alternator checks out good. What could be the problem??


The problem is that an electrical component in the BMW that should be dormant when the vehicle is shut down is actively drawing power.
The only way to track it down is to have tests run to see which circuit is drawing excessive power because there are numerous components that might be the cause.

You can learn more here...........
Solving Automotive Electrical Problems

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Jan 18, 2016 | BMW Cars & Trucks

2 Answers

Battery keeps going dead. Put new one in.


You have a Drain on your Battery. The Nominal drain during the night is 50mA. Anything more than that and you have a issue.

Put a Multi-Meter on your Battery (Between your Battery and your One Terminal's and then one on the Wire itself (Disconnect the NEGATIVE Clamp). MEasure the AMPERAGE DRAW...

Then disconnect one fuse at a time and if the number does not go down. When you get the DRAMATIC DROP, then you have found what system has the draw (test all just for a Piece of mind).

Then once you discovered which system, then you need to dig into that system to define it down to the problem and fix it and then you will have your issue resolved.

Good Luck

Apr 14, 2013 | 1998 BMW Z3 Roadster

1 Answer

1998 bmw z3...put a new battery in..asked for code..managed to obtain code but cant turn the volume up..seems muted yet shows the radio stations (display is very faint)


I hate to say this, but I doubt the radio or battery has much to do with it.
This is just a wild guess, but I would suggest you get a voltmeter and check the alternator output.
It should be 12.5 at idle, but over 13.5 when reved up.
If the radio is weak output, it seems to me it is getting less then 12 volts input, or else it had blown internals.
Another possibility is that a door speaker wire may be shorting and draining radio power.
Hard to guess.

May 17, 2010 | 1998 BMW Z3 Roadster

1 Answer

My bmw 2002 z3 reverse lights wont come on. Its not the bulbs. What could it be?


There is nominally a fuse, relay, and a switch associated with your reverse lights. Possible repair listed from 'easy to hard' by escalation

easy:
disconnect your negative battery cable, check the fuse block. It should be a 20A fuse(#F203). Some models use a 10A fuse(#F26). Replace as needed
Reconnect the battery, test.
if that doesn't work...

moderate.
have already checked the fuse, check to see if you have a "reversing light relay" (K6325) (My 2001 z3 does not) If present, disconnect negative battery cable and replace the entire relay. It is not worth trying to refurbish them.
Reconnect the battery, test.
if that doesn't work...

hard...
If both the fuse and relay are in good order, it is likely a fault in your wiring or the "reversing light switch"(S8511)

On the manual transmission:
The switch is located on the left of the gertrag transmission
The switch is located on the right of the ZF transmission

unscrew the switch from the transmission
install the new switch, tighten to 15 ft-lbs torque

On the automatic transmission:
If replacing the fuse and relay did not work there is an issue with your transmission range switch, various shift solenoids, shift linkage, etc. I highly recommend a dealer or qualified facility's examination.


I hope this helped!

Mar 17, 2010 | 2002 BMW Z3

1 Answer

I have a bmw 2001 330ci convertible which had the alternator replaced twice in a month and half.the mechanic is claiming that there is an electrical problem and he cannot figure it out and to go to the bmw...


it seems like something is draining your battery while the car sits overnight. causing the battery to get weaker and weaker putting stress on the alternator making it fail prematurely. the dealership will do a paracidic drain test where they'll find out what is draining your battery while your car sits overnight. it could be a bad module somewhere that's staying on when it shouldn't be.

Feb 17, 2010 | 2002 BMW 5 Series

1 Answer

My z3 starting problem


i would say its a dead (flat) battery. if its more than 4 or 5 years old, it might be time to replace it.

try jumping it with another vehicle. if it jump starts, then replace the battery.

if its a newer battery (less than 4 years old), then something is draining the battery or the alternator is not recharging it.

Mar 11, 2009 | 1999 BMW Z3

1 Answer

Yes i have a 99 bmw z3 coupe will not start been 2 the bmw dealer they replaced the computer but stil couldnt fix the problem, it started with i let car sit up for a month covered , went too go start it...


hi,i have bmw z3 coupe 1999,2,8.i was having same problemes,and it` cost me money by mecanic by geusing(starter,altermateur) like 1200$,belive me the probleme was the battery, get a new battery,and make sure the+ i mean the red line in the battery is good and try to move it to make sure good luck..

Jan 11, 2009 | 2002 BMW Z3

1 Answer

Mysterios drain on battery 1996 BMW Z3 1.9


look at the dome light switch on the drivers side for corrosion etc. make sure it isnt pulling the circuit down

Dec 08, 2008 | 1996 BMW Z3 Roadster

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