Mechanical/Electrical Wiper/Washer System Diagnosis

Some vehicles may exhibit a condition where the windshield wiper blades chatter or wipe unevenly. Several different conditions can cause wiper blade chatter. To completely repair wiper blade chatter, all or following should be checked and repaired as necessary:
^ The windshield glass must be clean.
^ The wiper blade element must be clean.
^ The wiper arm tip pressure must be within specification.
^ The wiper blade element set must be within specification.