hello everione i just bought a 2000 cadillac sts i ran the codes in the dash board this mornin and it gave me these can yal please tell me what they mean?

ABS C1214 CURRENT
ABS C1246 CURRENT
ABS C1248 CURRENT
DIM U1016 HISTORY
IRC U1016 HISTORY
RIM U1255 HISTORY
TTM U1016 HISTORY


then this afternoon i go to check the codes again and it only gives me these now

ABS C1214 CURRENT
ABS C1246 CURRENT
ABS C1248 CURRENT

can anyone tell me what these mean so i can fix it? is it normal for the computer to give me 7 codes in the mornin and then in the afternoon just 3?