Duramax Diesels Forum Truck of the Week
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Old 02-28-2016, 01:33 PM
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Default LMM turn signal hyper flash with LED bulbs

I put a set of LED bulbs in an 08 for a friend of mine last night and of course it was hyper flashing. I had hoped we could fix it by reflashing the bcm, but we couldn't find a calibration or option in TIS2Web to take care of it. I built some resistor packs last night to simulate the load of the 3157 bulbs, and it worked perfect all night. This morning he called me and said it started hyper flashing again. He brought it back over, and I redid some of the connections. Once I got it all back together they were working right again, but he called me not even five minutes after he left and said it was doing it again. Anyone else ever had this happen or have any idea what is going on?
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Old 02-28-2016, 01:44 PM
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Couldn't tell you what's happening there but I installed this on my truck- http://www.amazon.com/Novita-LM487-F.../dp/B001KS6GIG
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Old 02-28-2016, 01:59 PM
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Originally Posted by Max Attitude View Post
Couldn't tell you what's happening there but I installed this on my truck- http://www.amazon.com/Novita-LM487-F.../dp/B001KS6GIG
That won't work on an LMM. Unless the research I've done is wrong, LMMs don't have a flasher module; the turn signals are controlled by the BCM.
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Old 02-28-2016, 02:16 PM
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You need to call in to techline and get a VCI number for the BCM programming I believe. Factory calibration detects 2 bulbs per side, you need the LED compatible programming that detects none.
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Old 02-28-2016, 02:27 PM
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Quote:
Originally Posted by elliottw View Post
You need to call in to techline and get a VCI number for the BCM programming I believe. Factory calibration detects 2 bulbs per side, you need the LED compatible programming that detects none.
That's what I was finding on the internet. I can't do that though because I'm not a dealership and don't have the dealer code to give them.
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Old 02-28-2016, 02:29 PM
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Quote:
Originally Posted by JoshH View Post
That's what I was finding on the internet. I can't do that though because I'm not a dealership and don't have the dealer code to give them.
Have him take it to the shop of a dealer and give a mechanic $5 and he'll probably do it
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Old 02-28-2016, 02:35 PM
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Quote:
Originally Posted by elliottw View Post
Have him take it to the shop of a dealer and give a mechanic $5 and he'll probably do it
I just texted him and told him to take it to his dealer. Thanks.
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Old 02-28-2016, 06:25 PM
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And now he texted me back saying they're working again...
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Old 02-28-2016, 08:29 PM
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Since I put on my fab fours bumper with extra turn signals, I have th me same problem. Comes and goes. I never bothered to get it reprogrammed.
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Old 02-29-2016, 05:17 AM
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Also interested mine does same thing after doing switch backs should I just wire resistors or get bcm flashed and how would I got about getting bcm flashed just tell dealer I put LEDs in


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Old 02-29-2016, 10:04 AM
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I wonder if your resistors are getting hot? The resistors I got with my LED bulbs have ceramic heatsinks built in and they get HOT in a hurry.
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Old 02-29-2016, 11:25 AM
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Quote:
Originally Posted by trashygasman View Post
I wonder if your resistors are getting hot? The resistors I got with my LED bulbs have ceramic heatsinks built in and they get HOT in a hurry.
As intermittent as it is, I don't think so. The first time it acted up was as soon as he started the truck to leave the driveway. The next time was after he had been driving.
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Old 02-29-2016, 07:05 PM
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Quote:
Originally Posted by JoshH View Post
As intermittent as it is, I don't think so. The first time it acted up was as soon as he started the truck to leave the driveway. The next time was after he had been driving.
Must be installer error then...
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Old 02-29-2016, 07:51 PM
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Someone has posted the module here before it's $80 or so through Napa
http://www.napaonline.com/p/NF_LM487
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Old 02-29-2016, 09:20 PM
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Quote:
Originally Posted by trashygasman View Post
Must be installer error then...
You're probably right...
Quote:
Originally Posted by malibu795 View Post
Someone has posted the module here before it's $80 or so through Napa
http://www.napaonline.com/p/NF_LM487
Does not work on an LMM. There is no flasher module on an LMM. The turn signals are controlled by the BCM.
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