- Buy a pair of H11 pigtails from your local GM dealer or eBay.
- Remove the headlight housings from the car
- Remove the round dust cap on the rear of the headlights.
- Unscrew the ONE screw holding H11B the connectors in and then replace the screw (so it's there if you ever revert the system)
- Let that H11B connector just fall into the housing. It won't go far but it'll stay out of the way.
- Install your bulbs.
- Plug in the pigtails, run the wires out the air vent, and scotch-clip them to the red and yellow and black wires in the six-pin headlight harness. The red wire is on the driver's side, the yellow is on the passenger's. Feel free to NOT take my word for it... use a multimeter or test light to verify operation for yourself.
- Tape up the connectors and replace the dust cap.
- Replace the housings into the car, ensuring they snap into the holders, and the two bolts are tight.
- Aim your headlights...
This should take all of 30-45 minutes to do, start to finish.