Morimoto Headlights - Fast Turn Signal, Turn Signal Error

tp503 · March 10, 2021

I just installed Morimoto XB Headlights (LF544) into my 2018 GMC Sierra 1500 SLT. Everything works great (DRLs, high beam, low beam, hazards) except the turn signals. I tried sequential and regular, both have the problem. Turning on either turn signal starts normal for a few clicks and then speeds up 2x and kicks out an error "Left/Right Turn Indicator Failure" (rear turn signals go in tandem with the speed). I called my local GMC dealer to see if they can reset the BCM in case the Morimoto LEDs are sending something to the BCM it doesn't like, but the guy in service I talked to said he doesn't think resetting would help. Any ideas here? They sure are beautiful headlights, but I can't keep them if they are always going to kick out an error message when I use a turn signal. Thank you!

xSHIFTxNASTYx · March 13, 2021

I'm not familiar with the Morimoto package and you didn't mention touching your turn signals, but I also had this problem going from halogen bulbs to LED bulbs. I had to add resistors to the turn signals in order to keep them from hyper flashing.

tp503 · March 14, 2021

I spoke with The Retrofit Company (parent company of Morimoto) who said they have experienced this from one other customer and already has this escalated with Morimoto to find the fix. My original thought was a resistor but the support agent said that won't do it. Will keep this thread updated once I have more info in case others experience the same.