Headlight Switch Test
WARNING: This page is about a different car, the 1994 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
With headlights on, battery voltage should be present at headlight switch terminals "K" (Yellow wire) and "J" (Brown wire). If voltage is not present, check wiring and switch.
Battery voltage should always be present at headlight switch terminals "J" (Red wire) and "H" (Orange wire). With headlights on, battery voltage should be present at headlight switch terminal "E" (Yellow wire). With parking lights on, battery voltage should be present at headlight switch terminal "C" (Brown wire). If voltage is not present at any indicated terminals, check wiring and switch.