Go Back   Club Lexus Forums > Lexus Model Forums > GX Models > GX - First Generation
Sign in using an external account
Register Forgot Password?

Do I need Resistor for LED Signal Lights

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 11-03-12, 01:20 AM   #1
guccigucci
Rookie
Trader Score: (0)
 
Join Date: Oct 2012
Location: BC
Posts: 53
Default Do I need Resistor for LED Signal Lights

I have come across some threads saying that if we switch our front turning signal bulbs we need resistors, some say we don't. So yes or no? I have come across these bulbs that I wanna get from ebay

http://www.ebay.com/itm/1156-1156A-1...c8d776&vxp=mtr

So do we need resistors or just buy these bulbs and plus and play?
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
guccigucci is offline   Reply With Quote
Old 11-03-12, 06:35 PM   #2
tz693
Driver
Trader Score: (0)
 
Join Date: Feb 2011
Location: NJ
Posts: 104
Default

No, you don't. These LED bulds are designed for 12V PnP. They already have resistors on the back of the LED arrays.
__________________
2004 GX Blizzard Pearl
HID Headlight
tz693 is offline   Reply With Quote
Old 01-31-13, 11:15 PM   #3
Taco_Kid
Pole Position
Trader Score: (0)
 
Join Date: Apr 2009
Location: az
Posts: 304
Default

its very simple, your OEM bulb has a wattage rating on it. my 2006 uses 1156A for turn signal up front, its a 12Vdc 27W bulb. thats about 2amps of current. a replacement LED bulb would need to allow about that (or some lesser value, but i dont know how much less) to keep the ECU happy.
Taco_Kid is offline   Reply With Quote
Old 02-01-13, 07:38 AM   #4
vince22
Driver
Trader Score: (0)
 
Join Date: Jun 2009
Location: ca
Posts: 161
Default

No worries...this one has built-in resistor / no hyper flash........

http://store.ijdmtoy.com/No-Resistor.../canbus-2g.htm
vince22 is offline   Reply With Quote
Old 02-01-13, 09:45 PM   #5
Taco_Kid
Pole Position
Trader Score: (0)
 
Join Date: Apr 2009
Location: az
Posts: 304
Default

the "no hyper flash" or "canbus" LED bulbs are way too much $$.

anyone know what the threshold current is for when the ECU thinks a bulb went bad? for now i replaced my bulbs with cheap $5 sylvania filament types. i will use the old bulb bases to build my own LED bulbs (yellow smd ~6000mcd 5pc on ebay is like 26 cents).
Taco_Kid is offline   Reply With Quote
Old 02-02-13, 09:50 AM   #6
mann777
Moderator
Trader Score: (0)
 
mann777's Avatar
 
Join Date: Apr 2006
Location: EARTH
Posts: 1,161
Default

By doing a simple mod on the flasher by adding a trimpot, it does wonders and you can LED to every side of GX wherever you want without thinking about any resister.
Here is what I did
Used a Burn Trimpot
Cost - $3
Time - 3 hours
Tools - Basic ones and a Fine Taper Saw file
Once completed all you have to do is turn the screw on the trimpot to the required resistance voltage and you wiull have you leds working and also your normal ones also.
The images are purely done as a passion to my GX.
Requirement - Litlle bit of Soldering knowledge to circuits boards of the Flasher Unit.
You can also purchase a new Flasher if you need to do as an additional standby kept for the original.
The images attached are buildup to the final finish.
Goodluck
__________________
LS400-1994/GX470-2004(KDSS) (HIS)
**********************
Ability is what you're capable of doing...
Motivation determines what you do...
Attitude determines how well you do it.

Last edited by mann777; 02-27-13 at 10:40 PM..
mann777 is offline   Reply With Quote
Old 02-02-13, 09:54 AM   #7
mann777
Moderator
Trader Score: (0)
 
mann777's Avatar
 
Join Date: Apr 2006
Location: EARTH
Posts: 1,161
Default

Important Point - Note the three point on the Circuit board where these wires needs to soldered.
__________________
LS400-1994/GX470-2004(KDSS) (HIS)
**********************
Ability is what you're capable of doing...
Motivation determines what you do...
Attitude determines how well you do it.

Last edited by mann777; 02-27-13 at 10:40 PM..
mann777 is offline   Reply With Quote
Old 02-02-13, 10:01 AM   #8
Taco_Kid
Pole Position
Trader Score: (0)
 
Join Date: Apr 2009
Location: az
Posts: 304
Default

flasher unit control mod. very nice, but please explain how the trim pot adjusts the little chip (is it a current sensing chip) ??
Taco_Kid is offline   Reply With Quote
Old 02-02-13, 10:12 AM   #9
mann777
Moderator
Trader Score: (0)
 
mann777's Avatar
 
Join Date: Apr 2006
Location: EARTH
Posts: 1,161
Default

Here is the specs sheet. Multi-turn for the tolerance range from the minimum to the max..
__________________
LS400-1994/GX470-2004(KDSS) (HIS)
**********************
Ability is what you're capable of doing...
Motivation determines what you do...
Attitude determines how well you do it.

Last edited by mann777; 02-27-13 at 10:40 PM..
mann777 is offline   Reply With Quote
Old 02-02-13, 10:48 AM   #10
Taco_Kid
Pole Position
Trader Score: (0)
 
Join Date: Apr 2009
Location: az
Posts: 304
Default

thanks for PDF.

i am still weighing whether or not to hunt down cheap "flicker free" bulbs like this
http://www.carid.com/2005-lexus-gx-l...s-3131376.html
and http://www.carid.com/universal-led-l...s-3659427.html
(an LED bulb should last a very long time, my oem bulb lasted almost 7 years)

or hack the blinker module

or make my own (can probably do this for about $5 per bulb)


quick math:
buy two bulbs for $28 and they last 10 years = 28/10 = $2.80/year
hack the module = free (i have lots of trim pots = future hassle or have to buy new module
make my own = $10 and they last 10 years = 10/10 = $1/year

and extra $1.80 per year to buy and only have to plug them in seems well worth it to me.


so my next Q is, why do all the books and sites show spade type bulbs for 2005-2008 GX470's but my front blinkers are 1156 bayonet style.

************************
so just an update. i would highly recommend the "buy 2 for $28" option for anyone who wants the plug-&-play experience. i will take the DIY approach. i bought two bulbs from eBay for $9.95 and will add my own resistor (i have enough parts to do this, etc). and for the rest here, i am right now testing various resistors to see what that threshold current is so i can choose a resistor that has highest ohms to allow the lowest current w/o blinker module freaking out, etc. i will report this # later.

Last edited by Taco_Kid; 02-02-13 at 12:56 PM..
Taco_Kid is offline   Reply With Quote
Old 02-02-13, 08:28 PM   #11
mann777
Moderator
Trader Score: (0)
 
mann777's Avatar
 
Join Date: Apr 2006
Location: EARTH
Posts: 1,161
Default

Use this simple calculator for LED Resistor Resistance.
http://led.linear1.org/1led.wiz
http://ledcalc.com/
__________________
LS400-1994/GX470-2004(KDSS) (HIS)
**********************
Ability is what you're capable of doing...
Motivation determines what you do...
Attitude determines how well you do it.
mann777 is offline   Reply With Quote
Old 02-02-13, 09:31 PM   #12
Taco_Kid
Pole Position
Trader Score: (0)
 
Join Date: Apr 2009
Location: az
Posts: 304
Default

the calculators seem wacky.
they dont know what the per LED forward current is for their rated typical forward voltage.

i'll measure the bulbs when i get them, and then use the biggest (ohms) resistor i can as a shunt to keep the blinker module happy. i'll take pics and post later.
Taco_Kid is offline   Reply With Quote
Old 02-03-13, 02:53 PM   #13
Taco_Kid
Pole Position
Trader Score: (0)
 
Join Date: Apr 2009
Location: az
Posts: 304
Default

i ran some load tests @ 12v. 33ohm, 16.5ohm, and 11ohm. it tripped on 16.5 but not on 11ohm. my guess is the module is set right under 1A.

so, here's a quick guide:
@ 12v
LED current / Resistor Needed
100mA / 13ohm
200mA / 13-14ohm
300mA / 15ohm
400mA / 17ohm
500mA / 19ohm
600mA / 22ohm
700mA / 25-26ohm
800mA / 35-40ohm
900mA / 50ohm
1000mA / 70-100ohm

recommend 1 or 2 watt rated resistor for longevity.
this table should allow for warning (flicker) if LED bulb goes bad (not tested)

my test
Click the image to open in full size.
Taco_Kid is offline   Reply With Quote
Old 02-03-13, 02:53 PM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
LED Flasher GX470 BTCTexas GX - First Generation 18 05-21-14 06:27 PM
H1156 and H1157 bulbs - melt my tail light housing? Shanty SC 400/300 3 07-21-10 10:43 PM
Need 1156 led! dbaby22 Lighting 0 06-30-10 10:29 AM
Brightest 1156 bulbs? Shanty SC 400/300 5 06-25-10 01:07 PM
7440 turn signal bulbs for cleared/aftermarket tail light dilema ProfesrLEX Lighting 7 08-23-08 03:53 PM


Tags
2005, canbus, flickering, gx, led, leds, lexus, light, needed, pdf, resistor, resistors, signal, signals, turn

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 08:26 PM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info