How do you fix error code C1100 in a Toyota Sienna?

Hi John, I would advise going right around the DIY attempt, and take it straight to a shop. The ABS system is going to need scan testing, and real time data to know what is going wrong. The list here is for certified shops in your area: http://repairpal.com/toyota-within-10-miles-of-pittsburgh-pennsylvania-15201