Ran across this, and thought I'd post it for reference:

Problem: Motor doesn't stop when switch is turned off
Possible cause: defective switch; defective wiper motor

Problem: Blades stop anywhere when switch is turned off
Possible cause: Open circuit between switch and motor; defective
switch; defective wiper motor

Problem: Motor runs slowly in all speeds
Possible cause: wiper linkage damaged or binding; defective wiper
motor

Problem: Motor runs in high but not low; motor runs in low but not
high
Possible cause: Open circuit between switch and motor; defective wiper
motor

Problem: Wipers won't come on in delay mode
Possible cause: Open circuit between switch and motor; defective
governor

Problem: Wipers won't stop running in delay mode
Possible cause: Open circuit between switch and motor; poor ground at
wiper motor; loose or damaged connector at governor

Problem: motor will not run
Possible cause: Open circuit between switch and motor;defective
switch; poor ground at wiper motor; defective wiper motor