2003 Z4 Electrical Issues

Discuss problems you have had or are having with your Z4
Post Reply
Rick891
Newbie
Newbie
Posts: 3
Joined: Mon Jul 09, 2018 6:21 pm

2003 Z4 Electrical Issues

Post by Rick891 » Mon Jul 09, 2018 6:26 pm

Help! I have a 2003 Z4 3.0 that has 89,000 kilometres on it. I have had no problems with the vehicle except one that is causing me nothing but grief. I am looking for suggestions or others who have had similar problems. My issue is if I do not drive the vehicle for a couple of days, the car will not start. I have had the battery replaced, everything checked to determine where a draw may be, but nothing has been found and the problem has not been rectified. On occasion, if I put the key in the ignition and wait a minute, it will start but it sounds like the battery is almost dead. Driving it regularly, there are no problems. The alternator, solenoid and starter are all fine apparently. Has anyone had a similar issue and if so, what was the problem. I have taken it to a BMW dealer and an electrical mechanic and they cannot determine what the problem may be. Thanking anyone in advance.

User avatar
dans6490
Member
Member
Posts: 865
Joined: Mon Apr 14, 2014 10:28 am

2003 Z4 Electrical Issues

Post by dans6490 » Mon Jul 09, 2018 6:57 pm

I have the same issue but thankfully it is a slower drain. With the nice weather, I’m driving it more regularly, which seems to top the battery up sufficiently and avoid non-starting.

However, any more than a week and mine is dead.

Replaced battery, checked alternator etc etc

Haven’t solved it yet but I do plan on investigating further at some stage.
Black - 2003 -e85 - 2.5i. 19'' BBS "twist". Facelift bumpers, facelift front and rear lights. M steering wheel. ZHP. Ram air scoop. Red seats. Stance coilovers. DLV back box.

Previous 2003 Silver e85

Rick891
Newbie
Newbie
Posts: 3
Joined: Mon Jul 09, 2018 6:21 pm

2003 Z4 Electrical Issues

Post by Rick891 » Mon Jul 09, 2018 7:36 pm

Thank you.....let me know if the issue is resolved and I will do the same......

User avatar
ph001
Senior Member
Senior Member
Posts: 1810
Joined: Mon Oct 31, 2016 5:53 pm
Location: N. Yorkshire.

2003 Z4 Electrical Issues

Post by ph001 » Mon Jul 09, 2018 8:41 pm

If you really do have a new fully charged battery being drained in 2 days thats about a 2A current draw... a bit low for the water pump but a bit high for things like an interior light (the drop down centre console is a favourite), cd player, aftermarket module etc. Buy this current clamp meter off amazon for a start and confirm how much current is being drained... TACKLIFE Multimeter, CM01A Clamp Meter Auto-ranging NCV Digital Tester, 4000 Counts AC/DC Volt and Amp Electric Meters, Ohmmeter, Continuity Detector, Capacitance, Frequency, Diode Measurement Tools https://www.amazon.co.uk/dp/B01N014CTB/ ... qBb4FK7WEW
2007 E85 Z4 3.0Si manual :driving:
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby

2004 E46 M3 coupe manual.

AC5L4T3R
Member
Member
Posts: 68
Joined: Thu Oct 05, 2017 10:00 am

2003 Z4 Electrical Issues

Post by AC5L4T3R » Tue Jul 10, 2018 9:35 am

Check the light inside the compartment between the seats. Mine was staying on and killing the battery. Disconnected it and problem went away.
2003 Sterling Grey 2.5i - RHD car living in a LHD country.

Rlove2201
Newbie
Newbie
Posts: 10
Joined: Thu Jul 19, 2018 8:35 pm

2003 Z4 Electrical Issues

Post by Rlove2201 » Thu Aug 09, 2018 8:15 pm

My 2003 Z4 had 89,892 miles when the problem occurred. Everything worked fine until a few days ago when I could not start it. When I turn the key the panel lights up but all I hear is a buzzing sound from under the hood. If I try to turn the key off and on a few times the panel goes dark. If I use a bypass to the solenoid it sparks and stops the buzzing as long as the clip is touching the solenoid but still no turning over? I checked the battery and it shows good. Anyone have any ideas?
The way I checked the battery was by hooking up my trickle charger and after about 5 minutes of indicating it was taking a charge it switched to showing it was fully charged. THE EVOLUTION CONTINUES:
. Just a couple of hours ago I got no lights anywhere when I turned the key. Just now I get an even stranger reaction; a clicking sound comes out of the center console (sounds like it anyway) and the P on the shifter is flashing in rhythm with the clicks? HELP
Last edited by Rlove2201 on Fri Aug 10, 2018 1:19 am, edited 1 time in total.

User avatar
ph001
Senior Member
Senior Member
Posts: 1810
Joined: Mon Oct 31, 2016 5:53 pm
Location: N. Yorkshire.

2003 Z4 Electrical Issues

Post by ph001 » Thu Aug 09, 2018 11:29 pm

How did you check the battery exactly? Sounds like a new one required to me.
2007 E85 Z4 3.0Si manual :driving:
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby

2004 E46 M3 coupe manual.

Rick891
Newbie
Newbie
Posts: 3
Joined: Mon Jul 09, 2018 6:21 pm

2003 Z4 Electrical Issues

Post by Rick891 » Fri Aug 10, 2018 12:46 am

I was able to resolve the issue through a second mechanic, not from the BMW dealership. The guy I went to specializes in European vehicles and electrical problems. He went through every possible electrical area of the vehicle and at the end of the day determined it was a faulty battery. Apparently one cell was faulty. I went back to BMW and advised them what the second mechanic found and they said he was wrong, but ultimately replaced the battery. Since then I have had no problems. BMW said they had to cause the battery to fail so it would be covered under warranty. I am a little suspicious of the dealership to say the least. Nevertheless, my problem was resolved and I found a fantastic mechanic. Thanks for everyone's suggestions and help.

User avatar
ph001
Senior Member
Senior Member
Posts: 1810
Joined: Mon Oct 31, 2016 5:53 pm
Location: N. Yorkshire.

2003 Z4 Electrical Issues

Post by ph001 » Fri Aug 10, 2018 7:50 pm

:thumbsup:
2007 E85 Z4 3.0Si manual :driving:
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby

2004 E46 M3 coupe manual.

Post Reply