Lights Not Working after other repair

Check Engine light illuminated.  Check revealed source to be power steering sensor.  I replaced sensor and then disconnected the battery to reset check engine light.  After that the headlights, parking lights, tail lights and interior lights would not work.  I checked the interior and parking light fuses and both were OK.  Could not identify any Relay that would cover the lights that were not functioning.  There is a very dim light inside the headlight area that burns continuously now.