I never heard of a variable speed for the wipers in a stock CRX. To the best of my knowledge all second generation USDM CRXs have High, Low, Intermittent , and Off switch positions. The Intermittent time period is one of the control functions of the Intergraded Control Unit (ICU). This function going flakey is a common fault of the ICU. If you have an actual control ring on the stalk it sounds like a mod to me.