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LED Replacement for DRL Turn Signals in Cadillac XLR - No Resistors - Replace or modify relay instead?


Active Member
Feb 1, 2021
Jacksonville, FL
My XLR/V(s)
2006 XLR
Hi everyone.

So, over the past 6 weeks, I spent a lot of time trying various LED replacement bulbs for the DRL's/Turn Signals. (Mind you, that my car is a 2006, and the headlamps are in near new condition, no burnt lenses). I did this, to be proactive to prevent any future damage. To my dissapointment, NONE of the canbus/error free ones work. They all failed, and they are all VERY HOT, if not hotter than the halogens. So, I decided to try the external load resistor with standard LED bulbs. They worked, perfectly, but, I think it's pure stupidity to have that much heat dissapating from resistors. Very inneficient. So, I pulled it all out and put the halogen bulbs back in, and will drive with my DRL's off until I can find (what I feel to be) an acceptable solution. Which leads me to this question: Does anyone know if the relay(s) in the XLR can be modified to prevent the hyperflash situation so as to not have to install the hot resistors? I found an article for someone who modified their relay in an Acura TL, and there seems to be some relays on the market that do this as well. Is this possible in the XLR? I'm not so savy to figure it out on my own, but there's got to be a better way. There just has to be. Here's the article I found in regards to the TL:

G-109: DIY-Eliminate LED Bulb Induced Hyper flashing WITHOUT LOAD RESISTORS - AcuraZine - Acura Enthusiast Community


Seasoned Member
Dec 29, 2017
My XLR/V(s)
2006 XLR Light Platinum
I have the LEDs installed with the load resisters and have has no issues for 2 1/2 years the resistor heat is not a problem but at least my DRLs are cool.

James Landi

Seasoned Member
May 21, 2017
Camden, Maine, and Melbourne, Fl.
My XLR/V(s)
2007 (red) with wire grrile
An interesting "side note." I just purchased a used Ford suv in which the last owner replaced halogen with LED bulbs--- He left me with the packaging and instructions for the new LED bulbs. Incredulous as it seems, the LED replacements have built in "mini cooling electric fans" as part of each bulb assembly. For decades, I made the general ASSUMPTION that LED lights ran cool, used much less power to produce light, and were long lasting.... Apparently, the "dropping resistance" in these LED assemblies suggests that, aside from more brightness, resistive heat calls into question the efficacy for replacing the halogens. THoughts? James

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