Odd headlight dimming
04-22-2009, 07:18 AM
#1
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Join Date: Apr 2009
Location: Montreal, Canada
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My Ride: 2006 525i
Model Year: 2006
Hello All,
New member here. Just acquired a 2006 CPO 525i with 45,000 km. I'm loving the car so far, but I've encountered a strange issue. My car is a Canadian-spec model equipped with daytime running lights: the inner halogen bulb of the headlight cluster is on whenever the main Xenons (outer lights) are off (i.e. during the daytime). When idling and parked against a wall, I can see the halogens dimming very slightly every few seconds, as if they're momentarily getting less power. If I rev the engine above idle, the problem goes away. Also, the Xenon lights are always fine (rock solid beam), even at idle.
Should I be concerned about this? The dimming only happens at idle, and it's very slight. Other people wouldn't even notice it - I just pay attention to such things... The car otherwise runs perfectly, with no errors or warnings.
Thanks,
cinergi
New member here. Just acquired a 2006 CPO 525i with 45,000 km. I'm loving the car so far, but I've encountered a strange issue. My car is a Canadian-spec model equipped with daytime running lights: the inner halogen bulb of the headlight cluster is on whenever the main Xenons (outer lights) are off (i.e. during the daytime). When idling and parked against a wall, I can see the halogens dimming very slightly every few seconds, as if they're momentarily getting less power. If I rev the engine above idle, the problem goes away. Also, the Xenon lights are always fine (rock solid beam), even at idle.
Should I be concerned about this? The dimming only happens at idle, and it's very slight. Other people wouldn't even notice it - I just pay attention to such things... The car otherwise runs perfectly, with no errors or warnings.
Thanks,
cinergi
04-22-2009, 07:43 AM
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My Ride: E60 530d M-Sport
Alternator/Generator, its pretty normal...........basically as your RPM drops the amount of charge going to the battery drops a little, the dimming should only be very slight however as you have indicated already.
Oh, and welcome btw
Oh, and welcome btw
04-22-2009, 08:20 AM
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Location: Thousand Oaks, California
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My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
Retired Rides - 1989 325i convertible, 1995 M3, 2002 X5, 2005 545i, 2008 X5 (Lemon)
Congrats on the new (to you) car and enjoy the forums!! 
BTW, slight dimming of the lights is normal, just keep an eye on it, or as it's a CPO take it to the dealer and let them check out the alternator etc.! 
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