To those who are trying to find the way to stop the “tail lights failure light” for models after July 97. For UCF20/21 before July 97, see post #8.

Below is the way to disable the module. All you need is just to lift up or remove the resistor indicated by yellow letters “Lifted”. When you use LED tail lights, this is simple, easy and safe compared to use high wattage resistors that generates more than 150 watts of heat.

So far I have asked this by several people and I decided to open this here.

 

Thank you for posting this!

It should definitely be added to the FAQ section....

 

ahh..these types of posts and info is what we look for from you yamae,awesome
maybe retitle it and have LED in there somewhere

 

Since my trunk liners were all removed anyway I tried this fix last night and worked like a charm!

Literally done in 2 mins from start to end. It is that easy once you have the liners removed...

Thank you again Yamae san!

 

where is the module located? great work yamae! thank you thank you thank you!

is that it in the red?

 

The one at the left indicated by a yellow asterisk.

 

Is there a how to for this for 95 and 96 models?

 

Here it goes. Lift or cut the leg of the resistor indicated by X.
Now I think I'd better change the title, but I can't do that. Will a moderator or someone, please change it. May be "How to modify the tail lights failure sensor for UCF20/21" would be better.

 

Ok cool. Is this in the same little red box posted a few replies earlier?
And is the box easy to open, do I need to take care opening it?

 

Thanks Yamae
Title changed. A definite addition to the FAQ.

 

Oh, Yes, for both. But you need to remove the trunk liner some though.

Thanks for the change, Mike.

I only have introduced the way to disable the function to detect the open tail light or the reduced current.

There is also a way to modify without disabling the function. This can be achieved changing the current sensing resistors shown in the photo at my first post. There are 3 sensing resistors which generate the minor voltage drop. The voltage drops are monitored by window comparators and when the voltage is out of the range, the error signal is generated.

Changing those resistors can keep the function on, but you need to do some experiments. Depending on reduced currents, you have to use matched resistors. Some LED tail lights consume the energy 1/5th and some 1/20th like mine which has high efficiency LEDs for industrial use. Depending on the reduced current, you need to select and use matched resistors.

 

sounds good yamae!

i would like to keep the function but you're right, it will take some current and load measurements to find the right resistance. my LED bulbs cause static on my radio when applying the brakes so i know they have a different load rating than the average units.

also the comparators may have a small window to sense the voltage drops. i was thinking of putting a potentiometer (adjustable resistor) and adjusting until the load is just right.

 

Good post. Thanks to all who make it happen.

 

I did this and my tail-light out thing still comes up my dash.

 

what LED tails are you using?