led turnsignals..lamp out

[rod from md]

i know...there are a bunch of threads about this but im not sure if my issue is different . my truck is not a daily driver so this issue just reared its ugly head 2014 big horn quad originally no leds anywhere

i put syneticusa led in the taillights a few weeks ago (these have resistor cans installed )
everything seemed fine. i then installed leds in the tag light(supposed to be canbus safe). again, everything seemed fine

i will qualify that and say the bulbs worked fine in the driveway w a visual check, but i hadnt driven the truck

yesterday, i was driving home and , when headlight were on, everytime i hit the brakes or turn signal, i get a lamp out message and a "ding"

today, i broke out OBDMX and alfa and changed all the settings for the rear bulbs to LED ( i will say i did the changes to LED for them all at once, so maybe thats it?) i have since checked the settings again w alfa, as i did the first changes about 4 hours ago, walked away for a bit , drove truck, walked away again


i thought the turn signal leds would be fine without changing settings ( as far as what i read here from others)

but no joy...ill leave it alone for the rest of the day and check later tonight or tommorrow

any ideas as to what ive done wrong??

 

[NJMOPAR]

Try swapping the halogen license plate bulbs back in and see if the tails work again. If so, get different ones. I have Philips 194 LEDs in my 2010 plate lights without problems.
Also check your 3rd brake light bulbs, they'll throw a turn signal message if they're out.

 

[Quick_Shifter]

i know...there are a bunch of threads about this but im not sure if my issue is different . my truck is not a daily driver so this issue just reared its ugly head 2014 big horn quad originally no leds anywhere

i put syneticusa led in the taillights a few weeks ago (these have resistor cans installed )
everything seemed fine. i then installed leds in the tag light(supposed to be canbus safe). again, everything seemed fine

i will qualify that and say the bulbs worked fine in the driveway w a visual check, but i hadnt driven the truck

yesterday, i was driving home and , when headlight were on, everytime i hit the brakes or turn signal, i get a lamp out message and a "ding"

today, i broke out OBDMX and alfa and changed all the settings for the rear bulbs to LED ( i will say i did the changes to LED for them all at once, so maybe thats it?) i have since checked the settings again w alfa, as i did the first changes about 4 hours ago, walked away for a bit , drove truck, walked away again


i thought the turn signal leds would be fine without changing settings ( as far as what i read here from others)

but no joy...ill leave it alone for the rest of the day and check later tonight or tommorrow

any ideas as to what ive done wrong??

Built in resistor failed or you have a third brake light out. It’s a process of elimination. Are you getting a hyper flash when using your turn signal?

 

[rod from md]

thanks

ill do that

also forgot to add that i cleared faults multiple times in alfa w no change

 

[rod from md]

the actual light seem to be perfect, flash normally and both run and turn work

turns work fine , brakes fine from the outside
ill try the original tag lights and , while i didnt touch the third brake light ( still halogen ) i will check again as well

 

[Quick_Shifter]

Tag light bulbs is a good place to start

 

[rod from md]

put the originals back in the tag light..no joy

gotta run back to work

because i did a bunch of changes to led all at once ( one session) im wondering if that messed things up. i know some say it takes time for the chnages to "take"...they are all still set as LED after multiple checks w alfa

 

[rod from md]

to be clear in case it matters, its a "park light out " message but happens when headlights on and either turn or brake used

 

[Quick_Shifter]

put the originals back in the tag light..no joy

gotta run back to work

because i did a bunch of changes to led all at once ( one session) im wondering if that messed things up. i know some say it takes time for the chnages to "take"...they are all still set as LED after multiple checks w alfa

I’ve never had an issue with it taking time

 

[Quick_Shifter]

The majority of the bulbs I use is from Danny @Underground Lighting

 

[NJMOPAR]

Maybe setting Alfa to LED and having CANBUS resistors is a conflict. Try resetting everything back to stock. The Syneticusa bulbs worked in my 2010, no Alfa.

 

[rod from md]

clearly im gonna have to back out to stock bulbs and figure from there.
i added the rear leds w the resistors and was "fine" ..but i hadnt driven it and/or had the headlights on /turn signal while i was inside until i drove it yesterday

sooo.. i tried it the way it should have gone...then i tried to use alfa to set to led..

ill update when i get back to it.. next step is insatll the original bulbs back

correct me if im wrong, but when setting a given bulb to LED w alfa, isnt the only change is the BCM no longer monitored the current for that bulb and thus wont give a bulb out message . .MY point would be that putting incadescents in w LED setting should work w no errors as well

 

[lpennock]

to be clear in case it matters, its a "park light out " message but happens when headlights on and either turn or brake used

It's the bulb design. Some 3157 bulbs will completely shut off the park/taillight side when the brake/turn side activate. This causes the current on the park side to go to zero which the computer detects as bulb out. Load resistors or different bulb brand are the only fixes.

Had same problem with switchback bulbs in my front. Wound up building a test fixture to see what was happening

Sent from my SM-T500 using Tapatalk

 

[rod from md]

It's the bulb design. Some 3157 bulbs will completely shut off the park/taillight side when the brake/turn side activate. This causes the current on the park side to go to zero which the computer detects as bulb out. Load resistors or different bulb brand are the only fixes.

Had same problem with switchback bulbs in my front. Wound up building a test fixture to see what was happening

Sent from my SM-T500 using Tapatalk

even when using alfa to change to led? im suspecting something like you said OR maybe a resistor is needed for both turn and tail?
current bulb only has one, which i suspect is turn to ground in parallel

 

[hunterdan]

Make sure your rear turns and brake lights are all set to led. I can't remember of there's a separate setting for rear turn or parking light, but change all settings to led. It may take 5-10 minutes for the settings to take after you change them. Might also be worthwhile to change the front settings to led as well.

 

[rod from md]

i have put the original bulbs back in.. of course, all is normal

for whatever reason, the led settings dont solve this issue, and i believe that maybe IPENNDOK may have discovered the problem

i took apart one of the bulbs, and the resistor "pack"
on these syneticuse bulbs are simply a 50w 6 ohm resistor inside a metal case and tied to the turn signal wires

for an experiment, im going to add a resistor to the running light wires and see how that effects the operation and whether it solves the parking light out issue...if it does, then ill see how much heat is built up w the park lights on and then decide whether its worth the risk...the good thing is i can test this on one light and go from there

there isnt alot of gain for the rears lightwise, but maybe the fronts might be worth the extra effort

 

[RedSRT4Me]

i have put the original bulbs back in.. of course, all is normal

for whatever reason, the led settings dont solve this issue, and i believe that maybe IPENNDOK may have discovered the problem

i took apart one of the bulbs, and the resistor "pack"
on these syneticuse bulbs are simply a 50w 6 ohm resistor inside a metal case and tied to the turn signal wires

for an experiment, im going to add a resistor to the running light wires and see how that effects the operation and whether it solves the parking light out issue...if it does, then ill see how much heat is built up w the park lights on and then decide whether its worth the risk...the good thing is i can test this on one light and go from there

there isnt alot of gain for the rears lightwise, but maybe the fronts might be worth the extra effort

They can get hot. The longer the turn signal blinks the more heat generated. They do the trick though to cancel hyperflash.

 

[Brian2081]

make sure you change the bulbs in the 3rd brake light to leds, those incandescent get HOT when used for long periods and have the tendency to warp that light fixture and cause it to leak water into the cab. TIP, fill the top gap between the light and cab with a good quality silicone, like permatex.

 

[rod from md]

make sure you change the bulbs in the 3rd brake light to leds, those incandescent get HOT when used for long periods and have the tendency to warp that light fixture and cause it to leak water into the cab. TIP, fill the top gap between the light and cab with a good quality silicone, like permatex.

yep thats on my list have what appears to be good canbus 194s but i changed everything to LED already in alfa when i was screwing around two days ago...like so many, weather and cold hinder progress

 

[Brian2081]

funny how a little thing like freezing temps tends to slow things down. lol