Hello. My daughter's 2002 Mustang V6 with A/T has developed a problem with the low-beam headlights. They will not turn on. All fuses look OK. Bulbs are good. The high-beam passing flasher works, but the high-beam setting on the multi-purpose switch does not work. Both turn signals work OK. Replacing the headlight control switch had no effect. She has been very diligent trying to track down the problem, but has not had any success yet. We are not very good at reading schematics and are not sure if replacing the multipurpose switch should be the next step to try or if there are any other components or connectors to test. Thank you for any help.