I bought a pair of Chinese-made LED Daytime Running Lights for my 2021 Prius. Fitted them into the bumper and they look good. The issue is that I need a source of +12V under the hood to power them up when the car is in the READY state. I really don't want to run a wire through from the passenger compartment. The only appropriate power I can find is the supply to the engine computer and I don't really want to tap into that. Any suggestions?
The 2021's already has DRL's installed, controlled by the headlamp stalk - at least here in the states. You can use a relay to the battery and tap your current DRL wire near your headlamps for a signal.
Thanks for the reply. My car has no DRLs as standard and I have not noticed a DRL wire. Any idea of location of DRL wire and/or color code please?
Sorry, don't know. These cars are on international platforms which some countries require DRL, so it's prewired and may require installing a fuse into the circuit. I found a DRL kit on Amazon, which has a wiring harness, which indicates that there is a tap under the hood somewhere near the front bumper. You'll need to consult a UK wiring diagram for your car.
Wire the DRLs directly to a hot power source (empty fuse slot, tap a high amp fuse, etc) using a relay with the ECU fuse (tapped) to switch the power to your lights. The relay's coil only draws current in the millivolt range, so there shouldn't be any problem with using that circuit.
