Wiper control issue

In the last snow storm to hit the Philly area I managed to screw up my wipers. The wipers couldn't over come the amount of snow/ice when switched on, made a sound, and ever since the control arm is not not able to perform all the functions. The wipers will stop wherever they are in the cycle on the windshield when the control is switched off. There is no intermittent and the wipers don't function after the spray button is pressed. Is it the control arm itself or something else?

Thanks,

Mark Douglas
1993 RRC LWB 195k