Alternative LED Turn signal hyper-flash fix.
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2004-2007 Cadillac CTS-V Appearance Mods Discussion, Alternative LED Turn signal hyper-flash fix. in Cadillac CTS-V Series Forum - 2004 - 2007; I did this alternative fix recently, and upon doing some searching (not very deep, I'll admit) I can't find that ...
  1. #1
    VincentT is offline Cadillac Owners Member
    Automobile(s): 2004 CTS-V
    Join Date
    Oct 2012
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    Alternative LED Turn signal hyper-flash fix.

    I did this alternative fix recently, and upon doing some searching (not very deep, I'll admit) I can't find that anyone else has mentioned it. It's essentially putting the load resistor on the rear turn signal circuit rather than the front.

    Anyone who has done minimal research on LED conversions for our DRL/TS knows that hyper flash must be addressed. This has typically (to my knowledge) been addressed in one of two ways. One less used way is to crack open the flasher module itself and disable the hyper flash. The second is to attach load resistors to the circuit between the module and the new bulb.

    Load resistors are a much easier option, but have the drawback of getting hot. This has required the load resistors to be mounted on a metal fixture (preferably in a place with air flow and away from anything you value). This is because our cars use the same bulb filaments for TS and DRL, and that means current is almost always going through the resistor, making it hot. But since the hyper flash is essentially "seeing" the resistance in the entire flasher circuit, it really doesn't matter where in the circuit the extra current flows. As such, I put the load resistors on the rear turn signals. I still mounted them on a metal surface to be sure though.

    This fixes the hyper flash and, in theory, the hot resistor problem. Since the only time the load resistor has current passing through it is when the bulb for the turn signal is on (which is not very much of the time) it does not get hot. I suppose technically it would warm up if one sat with the turn signal on for an extended period of time or had to have hazards on for a while. I was concerned that the resistor (providing what is essentially a current shunt) may make the rear signal look sickly, but it does not.

    I've had the car like this for a while now and it works perfectly.

    Has anyone else done it this way?

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  3. #2
    fweasel's Avatar
    fweasel is offline Cadillac Owners Fanatic
    Automobile(s): 2007 CTS-V
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    Re: Alternative LED Turn signal hyper-flash fix.

    So a single set of load resistors installed on the rear turn signals are sufficient to eliminate the hyper flash when LED's are used on front and rear turn signals?

  4. #3
    VincentT is offline Cadillac Owners Member
    Automobile(s): 2004 CTS-V
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    Re: Alternative LED Turn signal hyper-flash fix.

    I can't vouch for when LEDs are used on the rear. I may invest in a rear set to see. Regardless, two sets on the rear would likely work unless they shunted too much current from the LED.

  5. #4
    LS6-Cts is offline Cadillac Owners Member
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    What kind of resistors did you use ...im actually having that problem and would like to go about it the same way and where can I get them .....thanks

  6. #5
    Bio248 is offline Cadillac Owners Member
    Automobile(s): '05 CTS-V
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    Re: Alternative LED Turn signal hyper-flash fix.

    there isn't an LED flasher replacement for our vehicles or is the flasher part of the BCM?

    edit: nevermind, you have to modify the DRL PCB to remove a load resistor. easy enough, but outside of what most are capable of doing.

  7. #6
    WesH8398's Avatar
    WesH8398 is offline Cadillac Owners Enthusiast
    Automobile(s): 2006 CTS-V
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    Re: Alternative LED Turn signal hyper-flash fix.

    Does this mean that if you already have your resistors installed up front, you wont need more resistors for the rear?

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