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To confirm your update, the running lights do not come on as part of the DRL function? If so, that does simplify things a lot. It also makes sense. If the low beams are on why bother with operating the running lights because they will have minimal effect in terms of improving the cars forward facing visibility.With the diagrams from [USER=37580]@Wild Turkey[/USER], it would be very easy to implement this function. All you need to do is switch on the headlight low beam relay by applying a ground to pin 2 of the relay (diagram on page 100-5). I expect a simple SPST external relay to apply this ground to the low beam relay. The external relay would be powered up in the ignition switch on position and there are probably 100 places in the car where you can pick an ignition on condition so it is impossible to be definitive about that. This may be 'enhanced' a bit if the low beams shut off during cranking; but, that fundamentally doesn't change the fact that the switching is probably being done at the low beam relay terminal 2. So, if you want to remove the function, I would start at the low beam relay and look for a foreign wire added to the red/blue wire on terminal #2 of the low beam relay and follow that wire to wherever. The connection has to be made before the 'headlight diode' otherwise the DRL function will interfere with the high beam operation.As an observation, as Wild Turkey has suggested, if the installation is tidy I would be inclined to leave it alone. In Canada, DRLs have been a thing since the late '80s. That is long enough that the majority of drivers have not experienced cars without DRLs and I find that most people have now become conditioned such that if the headlights or DRLs are not on, the car is not perceived as moving. I have a vintage Volvo and I added a DRL function to the headlights because people did not perceive it as moving even though it was firmly in the driving lane and is not a small car. This led to some pull into the path events because 'they did not register the car as moving'. The US was late to the DRL game and that conditioning may not have occurred (yet); but, my opinion is that the NSX has a small frontal profile and needs all the help it can get in terms of making people mentally aware of its presence. Flashing red and blue lights would probably be effective . When I got my car USDM car it had a minimalist installation using the running lights as DRLs. I went out and purchased some dedicated much brighter LED based DRL strips to make the car's presence more obvious.Your car, your choice.
To confirm your update, the running lights do not come on as part of the DRL function? If so, that does simplify things a lot. It also makes sense. If the low beams are on why bother with operating the running lights because they will have minimal effect in terms of improving the cars forward facing visibility.
With the diagrams from [USER=37580]@Wild Turkey[/USER], it would be very easy to implement this function. All you need to do is switch on the headlight low beam relay by applying a ground to pin 2 of the relay (diagram on page 100-5). I expect a simple SPST external relay to apply this ground to the low beam relay. The external relay would be powered up in the ignition switch on position and there are probably 100 places in the car where you can pick an ignition on condition so it is impossible to be definitive about that. This may be 'enhanced' a bit if the low beams shut off during cranking; but, that fundamentally doesn't change the fact that the switching is probably being done at the low beam relay terminal 2. So, if you want to remove the function, I would start at the low beam relay and look for a foreign wire added to the red/blue wire on terminal #2 of the low beam relay and follow that wire to wherever. The connection has to be made before the 'headlight diode' otherwise the DRL function will interfere with the high beam operation.
As an observation, as Wild Turkey has suggested, if the installation is tidy I would be inclined to leave it alone. In Canada, DRLs have been a thing since the late '80s. That is long enough that the majority of drivers have not experienced cars without DRLs and I find that most people have now become conditioned such that if the headlights or DRLs are not on, the car is not perceived as moving. I have a vintage Volvo and I added a DRL function to the headlights because people did not perceive it as moving even though it was firmly in the driving lane and is not a small car. This led to some pull into the path events because 'they did not register the car as moving'. The US was late to the DRL game and that conditioning may not have occurred (yet); but, my opinion is that the NSX has a small frontal profile and needs all the help it can get in terms of making people mentally aware of its presence. Flashing red and blue lights would probably be effective . When I got my car USDM car it had a minimalist installation using the running lights as DRLs. I went out and purchased some dedicated much brighter LED based DRL strips to make the car's presence more obvious.
Your car, your choice.
