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Pulse Delay Operates Incorrectly Or Not At All

WARNING: This page is about a different car, the 1997 Oldsmobile Aurora and 1997 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to OFF position. Disconnect wiper switch 48-pin connector, located at base of steering column. Turn wiper switch to DELAY position. Connect ohmmeter between wiper switch connector terminals E1 (Yellow wire) and E5 (Pink wire). See Figure . Move wiper switch through entire delay range.
  2. Resistance should vary from about 24 k/ohms to 1.2 megohms. If resistance is not as specified, replace wiper switch. If resistance is as specified, measure resistance between wiper switch connector terminals E1 (Yellow wire) and E3 (Dark Green wire).
  3. If resistance is more than 3 ohms, replace wiper switch. If resistance is 3 ohms or less, check for open in Gray wire or Pink wire between wiper switch and wiper motor. If circuits are okay, remove wiper motor cover (circuit board).
  4. Check to see if park switch pulse terminals are touching pads on circuit board. If contacts are touching pads, replace wiper motor cover. If contacts are not touching pads, replace park switch spring contacts.
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