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Old 10-12-2017, 12:07 PM   #1
99scooby
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Join Date: Jun 2005
Default LED help

Hey Everyone,
Hoping you guys can shed some light/experience on a concern I have. I picked up my 2017 Impreza Sport about a month ago. Being a Canadian car, the Sport comes with LED headlights wih LED DRLs wrapped around them and the halogen foglights. I basically adore the LED headlights and they were a major factor on my decision to go with this model over the touring. The problem is, they do make all the other lights look dim and a little cheap in comparison especially the foglight. I plan to replace them eventually with these as they seem to be the right choice and a direct fit.

https://www.amazon.ca/Philips-X-trem...s=2017+impreza

In the meantime, I've been looking into changing out the other bulbs to get rid of the dim yellow light that these cars come with. I know that most modern cars now seem to use canbus and that simply putting in an LED will cause the car to freak out. Sylvania makes LEDs that are compatible with most bulb outage detection circuits. The local Canadian Tire and Walmart seemed to have a few on clearance so I picked up a pair of 194s and a 3175 for the dome light. After installing them I got no error codes or freak outs by the car that I could see and the nice white and white/blue lighting that really starts to make the car look sharp.

Spurred on by this, I picked up a 10 pack of canbus compatible 194 bulbs for the front/rear side markers, cargo light, and tail lights. I also grabbed a 2 pack of canbus compatible 3175 led bulbs for the map lights. Both seemed to have good reviews. All were bought on amazon with links below. I took my time installing them and making sure they lit properly and buttoned everything up nicely leaving me with the majority of the lights on my car now being bright white LED!

Now the horror story part, on getting home from this work and starting to look into if they make canbus turn and reverse lights to possibly bypass the dreaded hyper flash, I start reading about at least some older Imprezas going the same route and canbus led bulbs literally melting harnesses/housings on bulbs that are always on (ie: just about every 194 I put in) or ruining the BIU. Is this the reality of it? Should I be going back tonight and pulling them all back out? I haven't done anything with lights on cars since my 99 Impreza way before this canbus stuff and leds with resistors built in.

Thanks in advance

194
https://www.amazon.ca/dp/B01CON7ZE4/...394800_TE_dp_1

3175
https://www.amazon.ca/dp/B01LZG6S3G/...394800_TE_dp_2
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Old 10-12-2017, 12:48 PM   #2
CRAZYHAWK
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Chapter/Region: Tri-State
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I'm using Sylvania Cool White LEDs in my 2016 Crosstrek without any problems. They draw less current than the original bulbs. If everything seems OK it probably is.
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Old 10-12-2017, 01:35 PM   #3
Mulder
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If the LED's have built-in resistors to increase the current draw, the resistors will create significant heat. If this heat isn't properly dissipated then the bulbs can fail and even melt. The smaller bulbs especially do not have enough space for any kind of decent heat sink.
Unless you know for certain that such bulbs are needed I'd avoid them. I have a bunch of non-resistor bulbs in my '15 and it doesn't care. AFAIK the only issue would be with the turn signals if the '17 doesn't have a separate flasher that can be replaced as in earlier years.
Personally I wouldn't install any LED's with resistors, either internal or external. Between the risk of failure/melting/fire and the resistors negating the lower-current advantage of the LED's it's just not worth it IMO.
Also I'd avoid the cheap LED's of unknown origin found on Amazon and eBay and stick with the more reputable vendors like Superbright LEDs.
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Old 10-12-2017, 04:24 PM   #4
99scooby
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Quote:
Originally Posted by Mulder View Post
If the LED's have built-in resistors to increase the current draw, the resistors will create significant heat. If this heat isn't properly dissipated then the bulbs can fail and even melt. The smaller bulbs especially do not have enough space for any kind of decent heat sink.
Unless you know for certain that such bulbs are needed I'd avoid them. I have a bunch of non-resistor bulbs in my '15 and it doesn't care. AFAIK the only issue would be with the turn signals if the '17 doesn't have a separate flasher that can be replaced as in earlier years.
Personally I wouldn't install any LED's with resistors, either internal or external. Between the risk of failure/melting/fire and the resistors negating the lower-current advantage of the LED's it's just not worth it IMO.
Also I'd avoid the cheap LED's of unknown origin found on Amazon and eBay and stick with the more reputable vendors like Superbright LEDs.
So if thats how they get to call it canbus, would a non canbus bulb not have a resistor and be a better option?
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Old 10-12-2017, 09:05 PM   #5
Big-E
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Based on what I know, the new Impreza may not have a separate turn-signal flasher and instead the BIU/ECU controls the signals. If correct, you would need to install a resistor at each of the four turn-signal sockets.

For the interior map/dome lamps, I highly recommend installing CANbus LED bulbs: https://www.superbrightleds.com/more...1mm/4015/8737/

For the interior vanity lamps, I installed non-CANBus bulbs: https://www.superbrightleds.com/more...-30mm-car/243/

I installed two CANbus LED front corner marker bulbs into my 2016 WRX STI LTD and the remainder (brake/park/turn/back-up) with non-CANbus bulbs, and experienced no issues.

I have also upgraded the fog-lamps to LED from Diode Dynamics.
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Old 10-13-2017, 08:08 PM   #6
99scooby
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Quote:
Originally Posted by Big-E View Post
Based on what I know, the new Impreza may not have a separate turn-signal flasher and instead the BIU/ECU controls the signals. If correct, you would need to install a resistor at each of the four turn-signal sockets.

For the interior map/dome lamps, I highly recommend installing CANbus LED bulbs: https://www.superbrightleds.com/more...1mm/4015/8737/

For the interior vanity lamps, I installed non-CANBus bulbs: https://www.superbrightleds.com/more...-30mm-car/243/

I installed two CANbus LED front corner marker bulbs into my 2016 WRX STI LTD and the remainder (brake/park/turn/back-up) with non-CANbus bulbs, and experienced no issues.

I have also upgraded the fog-lamps to LED from Diode Dynamics.
That's awesome thanks for the info! I'm a little confused on why the front corner markers would need CANbus though.
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Old 10-14-2017, 01:25 PM   #7
Big-E
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Quote:
Originally Posted by 99scooby View Post
That's awesome thanks for the info! I'm a little confused on why the front corner markers would need CANbus though.
I was not sure and so I opted to install CANbus bulbs at those two positions.
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