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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-23-2016, 08:17 PM
SpeedyGonzalez SpeedyGonzalez is offline
Registered User
Location: Aloha, Oregon
Join Date: Apr 2016
Posts: 1
Mein Auto: BMW 525i 2003
Electrical Issues

Hello Everyone,

I am currently having some electrical issues with my BMW 525i 2003. My window wipers, locking system, tail gate, and radio are not functioning. It started when I left my lights on and it killed my battery. Thus I had to charge the battery and that's when all these problems started happening. I have changed my wiper relay hoping I would at least resolve my window wipers issues but it hasn't. I have checked all my fuses and they all seem fine. Any ideas of what could be the issue or what relay I should be looking into? Please help.
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Old 04-23-2016, 11:26 PM
edjack edjack is offline
Officially Welcomed to the 'Fest
Location: San Jose, CA
Join Date: May 2007
Posts: 12,128
Mein Auto: '97 540i 6 speed
Battery slowly dying and weird results.

There is some anecdotal evidence that suggests that, when the battery slowly dies, the various electronic modules enter an undefined state.

Wake the car up (open the boot) and let it go to sleep (16 min). Disconnect the negative terminal of the battery and let the car set for some minutes (15?). Reconnect, and observe the results.

Report back.

Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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Old 04-24-2016, 01:27 AM
Sroor9001 Sroor9001 is offline
Location: Bahrain
Join Date: May 2014
Posts: 752
Mein Auto: Bmw 525i 2002
Yep just be sure that batter is ok and not in it's way to die cause non healthy battery is the main source of electrical problems even thermostat ,aux fan will suffer while working
Good luck
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Old 04-24-2016, 07:49 PM
u.nanimous u.nanimous is offline
Certifiable BMW Whackjob!
Location: SE Michigan
Join Date: Oct 2014
Posts: 1,842
Mein Auto: 1999 740iS, 2001 330xi
I'd suggest going 1 step further than what Edjack has posted...remove both battery cable and clamp them together for 10-15 minutes. Actually, if you have a second vehicle that would be a good time to take the battery up to the store for a load test.

After...(this may take a few years, it's my DD and I have bigger projects)

2005 Venture Extended LT - what else you gonna drive when you have 6 kids, cargo and still want better than 10MPG
2000 Impala LS - because you need something to beat the snot out of in a Michigan winter
1999 BMW 740i - why do I have Chevy's again?
2001 BMW 330xi - father/son project time!
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