Hair Dying/Highlighting Problem? Please help me!?

Ok so last August I got my medium-slightly darkish brown hair highlighted with blond highlights. Its permanent, It was doe with bleach then die. It did not kill my hair and I took good care of my hair and it's fine. The only problem is that my highlights are very grown out now and I do not want to spend $75 to get them touched up. My friend has alot of experience with John Frieda Precision Foam Color, I also have a $5 off coupon :) So my question is if I want to dye my hair a dark brown around august so it doesnt turn a different color in chlorinated water, will it dye my highlights the same color too?