my friend has a 97 bonneville that the wipers won't shut off. on 1997 Pontiac Bonneville

I'm sure it's the circuit board on the front of the motor, when I tap on it with a screwdriver handle I can make it start at will. My question is do I have to replace the entire motor? or can I find the circuit board separate?

Asked by for the 1997 Pontiac Bonneville