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Another interesting DIY thread for the electrical gurus. I'm eager to see if more comes of this...I would love to see red lighting used instead of the factory white, although I don't have the same complaints and think the white actually looks great!
The main thing is to know the exact value of the resistors. In fact on the board we have 3 X 1500 ohms but cannot determine which are parallel or serial. Two possibilities, either to measure with an ohmeter or give the circuit sketch. The photo is not sufficiently clear. With this value, knowing that power is around 13v we can determine the caracteristic of the LED and can found a similar one in other color. It also remain possible to obtain more brightness in modifying the total resistors value but, may be, with less reliability in the time.
The main thing is to know the exact value of the resistors. In fact on the board we have 3 X 1500 ohms but cannot determine which are parallel or serial. Two possibilities, either to measure with an ohmeter or give the circuit sketch. The photo is not sufficiently clear. With this value, knowing that power is around 13v we can determine the caracteristic of the LED and can found a similar one in other color. It also remain possible to obtain more brightness in modifying the total resistors value but, may be, with less reliability in the time.
What I CAN tell you is that however Lexus/Toyota wired this module up it will not work correctly when you use the PWM dimming wires in the car. I am doing this with my 2020 and it will keep the center analog clock illuminated even with the car off/lock/armed. It's either keeping a module awake or sending a false signal somewhere. It's a shame because I really wanted these to be dimmable with the rest of the lights. I just can't for the life of me figure out another way of tying them into the system.
I can however wire them into the auto headlight function. That's not an issue at all. When you have it in auto they will come on or off depending on the lights. Or if you manually want to turn them on or off with the headlights on/off that's what they do now.
It's funny because if I test with ANY other lexus LED or my leds, none of them exhibit the clock staying on quirk like this module posted above.
It also seems odd that they used 3 1500 ohm resistors when normally I think I've used a 360-400ohm resistor to take the 12v source and have it power an LED. Seems excessive for that much resistance? Not sure why they did that. I feel that's what is causing an issue perhaps?
12-28-17, 06:10 AM
Ambient lighting upgrade
