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Old 09-28-2019, 08:15 PM   #1
lrbraner
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2002 L-Series 3.0L Sedan
2003 L-Series 3.0L Wagon
Default 2002 L300 LED DRL solutions ?

Has anyone been successful in finding a 9005 (High Beam ) LED that also works properly as a DRL ?

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Old 10-08-2019, 07:30 AM   #2
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Default Re: 2002 L300 LED DRL solutions ?

None. The way I read the wiring diagram in the Haynes book, the DRL are powered backward from the regular lights.
There isn’t an LED that will run both ways.

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Old 10-08-2019, 05:33 PM   #3
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Default Re: 2002 L300 LED DRL solutions ?

If I'm not mistaken, headlight wiring (regardless of drl wiring or not) remains as it always was, a 12v DC system. There's no such thing as backward powered headlights. Direct current means voltage has polarity. And to dispel assumptions of electrical flow, electron flow is from negative to positive. Any debates against this will have to explain why alternators have a fusible link wire, sized to carry no more than around 25 amps while the alternators are rated anywhere from 85-250+ amps. No large battery (positive) cable connected to it. HINT#1; guess why engine and chassis grounds are used and battery negative connects to chassis first with a second cable connecting chassis to engine block? And explain why starters and alternators use their cases as ground. The starter is the only direct battery connection requiring the only large gauge battery cable. If an alternator can generate 80 amps plus, the fusible link wire surely cannot handle more than twice it's rated current. HINT#2; the fusible link wire is a fuse to prevent more amperage from damaging the electrical system if the primary circuit of alternators short circuit to damage the battery. The alternator secondary circuit creating power does not flow thru the fusible link wire. Remember, electron flow is negative to positive. Basic electricity.


GM, in their varied wisdom decided on several drl circuits; low beam, high beam, series and parallel wired DRLs. Unless one has a basic understanding of series and parallel wiring circuits, understanding daytime running lights may be confusing many with assumptions. Some GM vehicles use series wiring where headlights are series wired to reduce current for drl use. In daytime, headlights using halogen lamps appear bright but are running at less than normal current. Halogen headlights do not dim at all if run in series wired configurations. When auto headlights switch from drl to nighttime lighting, the series wired headlights are switched back to conventional parallel wiring so both headlights receive full power. Another drl circuit uses a resistor to reduce current to headlights without wiring them in series. Again, halogen headlights do not dim with reduced current and allows longer life to halogen lamps. Drl circuits switching high beams may use series or parallel wiring. Series wiring to prolong lamp life, parallel wiring because high beams are used less in general compared to low beams. Using high beams for DRLs allows prolonging low beam life. If anyone notices, no discussion of polarity or electron/current flow is mentioned. There is no reverse current flow or backwards powered circuits. GM cleverly made use of electrical circuit design to use halogen lamps to avoid adapting to high intensity discharge lights, HIDs. Halogen lights are not prone to dimming when current is reduced. Older incandescent lights dim when corroded wiring occurs. Incandescent headlights cannot be wired in series. The results are dimmed headlights and useless for drl use. GM cleverly avoided hid lights in the American market for awhile until marketing forces pushed them to incorporate hids as hid costs came down.

Anyone remember when the first cars imported to America were the first to use hid headlights? As word spread how bright they were, thieves began stealing them to resell in the 'midnight auto market'. Hid lights were valued around $1500 a pair...... fast forward and hid kits are as low as $50. Led headlights are the new thing in lighting.

To answer the question of whether or not led headlights can work on '02 L300 high beams in drl mode presumes high beams are used in drl mode. What isn't brought up is how high beams are wired in drl mode. A wiring diagram is needed to determine if drl mode is wired as a series circuit, uses a resistor to reduce power or...... There may be a wiring diagram in these forums but caution is needed. With various wiring configurations, only the correct diagram for '02 L300 is necessary to determine if led high beams can work or not. If high beams are series wired in drl mode, the reduced current may not let both led high beams turn on. Remember, normal headlight wiring (regardless of whether low or high beams) are always wired in parallel. GMs drl mode presents unusual wiring schemes to avoid hid lamps and the requisite projector light housings (the bullet style small headlights) to keeps overall vehicle manufacturing costs down until hid light costs dropped. About ten years before hid lights became standardized in the American market.

And to appreciate if led high beams can work, yes they can if mods are made to existing wiring. This requires advanced wiring skills along with above average knowledge of electricity.

Last edited by fdryer; 10-08-2019 at 05:38 PM..

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Old 10-09-2019, 10:42 PM   #4
Chaz9496
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2001 L-Series 2.2L Sedan
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Default Re: 2002 L300 LED DRL solutions ?

Does anyone remember: 1992 was the first HID headlight system on the BMW. The first HID light was introduced 314 years ago.

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Old 10-09-2019, 10:51 PM   #5
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Default Re: 2002 L300 LED DRL solutions ?

I recently saw an S Series with LED running lights. I believe certain years used the High and Low beam as the same bulb is why.

Last edited by Chaz9496; 10-09-2019 at 10:54 PM.. Reason: Added Comment

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