One problem related to windshield wiper/washer switch has been reported for the 1996 GMC Safari. The most recently reported issues are listed below.
Wiper switch disconnects when turned "on". GMC service manager believes there were recalls for this defect but unable to find for GMC vehicle; believes there was recall for same problem on other GMC - Chevrolet astrol models. Reports there have been a lot of similar defects seen and to wait until recall is official before replacing $100. Switch.