Brake warning light on dash not coming on during self test

My daughter-in-law has this car and recently failed inspection due to the "brake" warning light in the dash not coming on during self test, it also wasn't showing the "ABS" light on self test. I found a diagnostic procedure on line and found she had a dead ABS control module, I got another one from the junk yard which fixed the ABS issue but the brake warning lamp still won't come on during power up, it does work if you press the emergency brake pedal though, so I know the bulb is good. I've tried locating a schematic of the system but haven't had any luck, the light will also come on if I push the brake fluid float down. Any ideas on where to look next?