The Iris headlight has a built-in daytime running light, or auxiliary positioning light. The plug on this light has an extra blue wire coming out near the H4 plug, and this wire needs to be extended and then run into a 12v source to activate the halo auxiliary light on the Iris.
Wiring this part of the light is OPTIONAL and does not affect the brightness of the light at night.
Common places to pick up the 12v DRL signal are
- Ignition (try picking it up at the windscreen wiper motor)
- An existing DRL on the vehicle