How do you program a keyless remote control from a Honda civic si 03?

To program a keyless remote control for a 2003 Honda Civic Si, first, sit in the driver's seat and close all doors. Insert the key into the ignition and turn it to the "On" position, then back to "Off" five times within 10 seconds. On the sixth turn, leave it in the "On" position; the doors should lock and unlock to indicate you're in programming mode. Press the "Lock" button on the remote within 5 seconds, and the doors will lock and unlock again, confirming the remote is programmed. Repeat this step for additional remotes, then turn the ignition off to exit programming mode.