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Thread: Passenger Side Headlight Not Working After Battery Drainage

  1. #1
    Join Date
    Jul 2010
    Location
    Irvine, CA
    Posts
    81
    My Cars
    1995 BMW M3

    Passenger Side Headlight Not Working After Battery Drainage

    Recently, I had a body shop repair my car and over the time they had the car, the battery got drained for some reason and I experienced a few electrical issues afterwards (outside temp not reading, trunk not opening, etc). Now everything is solved but the passenger side low beam.
    First I thought it was the bulb but I swapped the bulbs side to side today and the result is the same.
    Where do I start? I would love to fix it but just not sure where to start looking,
    Could it be just a bad battery?

    Thanks,

  2. #2
    Join Date
    Feb 2015
    Location
    Atlanta, GA United States
    Posts
    12
    My Cars
    1994 740iL, 2004 645Ci,
    I am having a similar issue. My passenger-side headlight is out. Not just the actual forward projecting Xenon, but the entire unit. Halo Eyes, high-beams and low-beams are out and the whole corner of the car is dark at night minus the right blinker should I activate the turn signal switch motioning a right turn. The fog lights operate normally. Very first time I have seen condensation inside of the the headlight assembly too. I am sure it's related but not sure why or how. I have disconnected my negative post for a while to clear the computers, but maybe not for long enough. Got a car wash with undercarriage jet-spray done almost 2 weeks ago but this started yesterday so I don't think that's the reason. Would my alternator be able to short my headlight assembly control unit? If so, would simply replacing the control unit resolve the issue?

    2004 645Ci 6 Speed Manual

    Could it be the need of an alternator and/or battery replacement? The lights worked perfectly until I had a power glitch while driving on a long downhill behind a slow driving Smartphone user who felt it ever so amusing to continuously tap her brakes or purely ride them all together. These big-boy cars don't like SLOW. Coasting now dims my digital display as well... Any suggestions are greatly appreciated ahead of time. Any Indie-Shop here in the Atlanta Metro with a quick-fix... HELP!!!

  3. #3
    Join Date
    Nov 2009
    Location
    czech republic
    Posts
    43
    My Cars
    E 34, E39
    Quote Originally Posted by wutanec View Post
    Recently, I had a body shop repair my car and over the time they had the car, the battery got drained for some reason and I experienced a few electrical issues afterwards (outside temp not reading, trunk not opening, etc). Now everything is solved but the passenger side low beam.
    First I thought it was the bulb but I swapped the bulbs side to side today and the result is the same.
    Where do I start? I would love to fix it but just not sure where to start looking,
    Could it be just a bad battery?

    Thanks,
    check it before charge, most probably yes, weak battery, just use votometer before cranking and after.t o test the charging system,

    Sent from my SLA-L22 using Tapatalk

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