One problem related to high/low beam switch has been reported for the 2003 Saturn ION. The most recently reported issues are listed below.
I was drove my car home one night and the headlights were working fine. I went in the house changed and got ready to leave again when I turned on my headlights they did not come on. Thought maybe it was the bulbs that went out but the bright lights worked. Had the bulbs check they were fine, I also checked the fuses to make sure that was burnt out. After a week the lights still were not working took it to a car mechanic and the analysis showed some sensor. He replaced the sensor and it did not fix the problem my low beam headlights are still not working.