I Also have a harrier with cracks in the dash,
over all it is a good unit over all, how ever, the cracks are just getting worse in our harsh New Zealand sun,
You are talking about the vinyl dash cover cracking correct? I can not give you any definite information, just some “as I recall” comments. Seems Toyota did have a program to replace the dash covers past the three year warranty. I do not know which models or years were included. But I would doubt they would cover any vehicle that is 13+ years old. I would guess you could order a replacement at your own expense.
In Florida I have seen that happen to many brands. My vehicles that stay outside always get the carpet-like dash covers to reduce sun exposure.