My intermittent wiper control doesn't work. Do I replace the wiper motor of something else?

 

If the wipers work at all, the motor is ok.

If it's just the intermittent wipe function, maybe first suspect a contact problem in the multifunction switch, or maybe a GEM problem, especially if your having other GEM control problems.

Some thoughts for pondering.

 

Buy, borrow or beg for an EVTM. Electrical Vacuum Troubleshooting Manual. It has pictures and diagrams and trouble shooting information for all electrical and vacuum systems.
The GEM module does a bunch of stuff, such as the interior light control, wiper delay, cruise control (I think), automatic door locks, one touch window down and more.
The intermittent system basically gives the wiper motor electricity for long enough to get the wipers from the park position, and then removes power. In other words, a pulse of power is applied, and then the wipers cycle one time in their 'return to park' phase, just as if you had turned on the wipers and then turned them off. They do the return on their own. If the wipers work normally, then I'd bet the problem is in the MFS or the GEM module.
That is why you need the EVTM. It will give you the pinouts of the MFS so you can test continuity, etc. The interval wiper system is covered in the EVTM, but the one I have calls the GEM the ICM[integrated control module].
tom