Ok guys. Ive done this to multiple members cars and is simple in theory but takes about an hour to do. The reason i have stopped offering to do this i dont have the time and i can not afford to replace your ecu due to slight differences from model to model. The risk is financially to high for me to take on someone elses car.
I used a DPDT relay with IGN2 source and Puddle lamp source also with a dedicated 12v for the entire DRL system. I also used another relay in series with this relay to create a true 50% DRL when parking lights were turned on.
You will have to disconnect the DRLs from the existing system due to Lexus ECU using resistive switching to turn things on and off. If you do not you will get stray voltages that will harm your ECU.
Lexus does not use traditional methods of switching they use a more technological millivolt and resistive switching setup in all thier circuit boards chips and ECUs.
If you want to achieve this DRL trick i suggest strongly that you disconnect the DRLs from the ECU and wire in your own setup so you do not harm the ECU as fingering with the electronics does not get you a replacement ECU under warranty!!
Good Luck !!
Planktoon007 may still have a video of one of the setups.
Alot of disapointment in the RCF wide spread.
Franky whats your opinion of the RCF as a street vehicle though. The majority of buyers may only track it once. Maybe not at all.
Majority of buyers would only be doing spirated street / twisty speed limited corner hugging.