I just failed a WOF (Warrant of Fitness) because my ABS light does not come on during startup.

I have checked the bulb and it is fine. Swapped it with the check engine light and the problem did not move.

I unplugged the ABS (orange plug on unit) in the engine bay. Light does not come on. Checked the 60A ABS fuse and it is fine.

Does anyone have any ideas or know any checks I can do to figure out what is going one?