Led Indicator swap.....

[Smithy2]

Hi, i have fitted some LED indicator bulbs to the rear (correct size and canbus error free) there are no lights on the dash board and when i tested them using the hazard warning switch they worked perfectly.  What i didn't test was the left right function stupidly and it seem that they do not work independently (fast flash as if there is a bulb out) I am wondering if it because I have not yet changed the front indicators from the standard bulbs and if this is done it will rectify the issue?

If the fronts are changed too then all indicators (rear, mirror and front) will be LED.

Any thoughts or experiences?

Cheers

[capese21]

You need load resisters. LED bulbs do not draw enough current so the car thinks there is a bulb out hence the fast flash.

 

I fitted LED bulbs to my previous IS300h. I mounted the resisters in a small diecast box to help dissipate the heat.

 

http://www.ebay.co.uk/itm/like/322078979919?lpid=122&chn=ps&googleloc=1007128&poi=&campaignid=620865095&device=c&adgroupid=27378760866&rlsatarget=pla-181484320146&adtype=pla&crdt=0

[Smithy2]

23 minutes ago, capese21 said:

You need load resisters. LED bulbs do not draw enough current so the car thinks there is a bulb out hence the fast flash.

 

I fitted LED bulbs to my previous IS300h. I mounted the resisters in a small diecast box to help dissipate the heat.

 

http://www.ebay.co.uk/itm/like/322078979919?lpid=122&chn=ps&googleloc=1007128&poi=&campaignid=620865095&device=c&adgroupid=27378760866&rlsatarget=pla-181484320146&adtype=pla&crdt=0

Yeah i have been reading up a bit on the U.S site - there are some bulbs with resistors built in but including shipping they are £120 for 4!  Do you know if the load resistors on your link will fit inside the light cluster?  Just wondering where to locate them otherwise.  Also, are they easy to fit - never really had to use them with other cars - are they a solder and heat shrink job?  Where in the line do they fit?

[Smithy2]

Yes i have looked at the decoder boxes, where did you mount the box on your LS?  I am not sure if there is enough room for the box behind the taillight on the IS

[steve2006]

If you do decide to go with the load resistors mentioned don't mount these on the plastic bulb housing as the heat may melt it. Mount them on a metal area away from heat sensitive devices or other wiring.

If you have ever tried to remove a hot 60w home light bulb from its fitting you will realise what heat is generated.

[capese21]

The "decoder" boxes are just a couple of resisters in potting compound. They will still get hot. I took one apart to see what was in it. I also found the universal connector a bit of a loose fit.  The LED bulbs are also longer & heavier and the ones I fitted had a note on them to apply glue so they don't fall out!  

Not sure I am going to bother on the GS unless i can find a LED bulb that doesn't require resisters.  It may also be possible to swap the indicator relay that doesn't hyper flash with LED`s.

This may work, I will see if it is the same as fitted.

http://www.ebay.co.uk/itm/LED-relay-flasher-Hazzard-FIX-rate-8-pins-Toyota-Nissan-Subaru-Mazda-/142017793390?hash=item2110eb8d6e:g:GxsAAOSwtJZXVrwv

[Smithy2]

14 hours ago, capese21 said:

The "decoder" boxes are just a couple of resisters in potting compound. They will still get hot. I took one apart to see what was in it. I also found the universal connector a bit of a loose fit.  The LED bulbs are also longer & heavier and the ones I fitted had a note on them to apply glue so they don't fall out!  

Not sure I am going to bother on the GS unless i can find a LED bulb that doesn't require resisters.  It may also be possible to swap the indicator relay that doesn't hyper flash with LED`s.

This may work, I will see if it is the same as fitted.

http://www.ebay.co.uk/itm/LED-relay-flasher-Hazzard-FIX-rate-8-pins-Toyota-Nissan-Subaru-Mazda-/142017793390?hash=item2110eb8d6e:g:GxsAAOSwtJZXVrwv

Like the idea of just changing the relay, however i have looked on the U.S site and apparently there isn't one on the 3rd gen IS - it is integrated behind the instrument cluster or something.  Also just checked with Lexus parts and they couldn't locate a relay specifically for indicators - only only for all lighting apparently.