Question is- can you add a lighted key ring to a 2002-03????
Short answer: Well I donít think that question has been answered one way or the other.
In theory you would need the illuminated key ring, a new upper and lower steering wheel cowling (or whatever it's called) due to the fact the ring needs a larger opening around the ignition barrel. The problem lies in the wiring since the existing wiring works off the dome light circuit. I compared the diagram of the 04 RS with a STI and noted there is no wiring for the RS.
I also physically checked it. So how would you power it? My idea would be to install the ring and see if the light could be powered off the positive brake light switch. Get in the car in the dark, push the brake and illuminate the ring.
If that worked , then buy the cowling to go with it.