Headlight DRL's run on a reduced voltage to lower the brightness of the incandescent bulbs in DRL mode. May not be enough voltage to fire up the LED's.
DRL lights not working.
- Thread starter mojoe
- Start date
yeah 6-9v not enough to fire up the LED drivers.
This car runs the bulbs in series for DRL, so each bulb gets 6 volts. Also the polarity of one of the bulbs reverses between DRL and high beam modes.
Resistors will not help here. Load resistors are for turn signals and brake lights so the lower current of the LED will not trigger the car's burned out bulb detection. Wasting current with a resistor in parallel with the LED replacement increases the total circuit current back to what is normal for an incandescent bulb.
Resistors will not help here. Load resistors are for turn signals and brake lights so the lower current of the LED will not trigger the car's burned out bulb detection. Wasting current with a resistor in parallel with the LED replacement increases the total circuit current back to what is normal for an incandescent bulb.
in this situation yes
My 2006 tundra had a grey-silver box on the LH side of the bay, mild heat fins on it. It was a resistor that made DRL happen by running the main beams through the resistor, (power limiter), which provided the hibeam filaments at basically reduced voltage. LEDS may or may not work with that.
Consider an HIR conversion if you can, google it. Halogen lamp, same filament placement. Less glare into traffic.
Consider an HIR conversion if you can, google it. Halogen lamp, same filament placement. Less glare into traffic.
Okay - problem solved! I received these yesterday, installed them in 2 minutes, and they work perfectly. Thanks to everyone for your advice!
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- Sep 17, 2025
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- 351
I just switched back to my original 9003 halogen headlight bulbs after using the newer led bulbs.
I just wanted to restore the DLR that I had originally , that was lost when upgrading to the led's.
Anyways, Saturday I had a family birthday party to attend, drove there at 5pm in the bright sunshine.
We left at 10:45 pm and this was my first time observing the re-installed halogens.
Whoa!....I forgot just how dull, slightly yellow my old halogens bulbs were!
But it could also be that my original halogen bulbs ( I bought the vehicle in 2015/installed the leds maybe 2018) were already nearing their life cycle and I just needed new headlight bulbs , either halogen or led...as long as something new.
So now i'm considering buying a pair of new average /basic halogen 9003 bulbs that are rated at 1,100 hours and 1000 LM .
The lifespan seems excellent, the 1000 lumens is apparently average vehicle headlight output rated at very good for city driving/ could be brighter for darker unlit highway driving.
Too be honest, i'm age 58 and I find myself doing less and less night time driving. I have aftermarket led driving lights mounted below in my front bumper (lower then the front license plate/adjustable so I can angle them down to the street/not bother oncoming drivers) and I also installed a pair of 7.5 watts leds amber lights where my factory installed fog lights should be, if the previous owner had checked off the factory accessory box when new.
I can always reinstall my LEDs back in late Fall......mid November (Nov.16th) is 5:30pm Sunset time.
2026 is the first year here in my part of western Canada that we will have no more daytime savings time resetting of clocks.
So, with trying to buy a reasonable priced/reliable halogen bulb...I think I go with the Sylvania 9003 Basic Halogen bulbs
I just wanted to restore the DLR that I had originally , that was lost when upgrading to the led's.
Anyways, Saturday I had a family birthday party to attend, drove there at 5pm in the bright sunshine.
We left at 10:45 pm and this was my first time observing the re-installed halogens.
Whoa!....I forgot just how dull, slightly yellow my old halogens bulbs were!
But it could also be that my original halogen bulbs ( I bought the vehicle in 2015/installed the leds maybe 2018) were already nearing their life cycle and I just needed new headlight bulbs , either halogen or led...as long as something new.
So now i'm considering buying a pair of new average /basic halogen 9003 bulbs that are rated at 1,100 hours and 1000 LM .
The lifespan seems excellent, the 1000 lumens is apparently average vehicle headlight output rated at very good for city driving/ could be brighter for darker unlit highway driving.
Too be honest, i'm age 58 and I find myself doing less and less night time driving. I have aftermarket led driving lights mounted below in my front bumper (lower then the front license plate/adjustable so I can angle them down to the street/not bother oncoming drivers) and I also installed a pair of 7.5 watts leds amber lights where my factory installed fog lights should be, if the previous owner had checked off the factory accessory box when new.
I can always reinstall my LEDs back in late Fall......mid November (Nov.16th) is 5:30pm Sunset time.
2026 is the first year here in my part of western Canada that we will have no more daytime savings time resetting of clocks.
So, with trying to buy a reasonable priced/reliable halogen bulb...I think I go with the Sylvania 9003 Basic Halogen bulbs
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