Testing System (Motor On Car)

If wiper is inoperative or intermittent, check for an open circuit in feed wire (terminal "2" on motor), loose mounting of wiper switch, defective switch or open circuit in wire to wiper switch (terminal "1" on motor).
If wiper will not shut off, but has both "LO" and "HI" speeds, check for a grounded wire (terminal "1" on motor) leading to wiper switch.
If wiper will not shut off and has "LO" speed only, check for a defective wiper switch, open circuit in wire (terminal "3" on motor) to wiper switch.
If wiper will not shut off and has "HI" speed only, check for a defective wiper switch, open circuit in wire (terminal "3" on motor) to wiper switch.
If wiper has "HI" speed only, check for an open circuit in wire (terminal "3" on motor) to wiper switch.
If wiper has "LO" speed only, check for a grounded wire (terminal "3" on motor) to wiper switch or defective switch.
If wiper blades do not return to full park position, check for loose wiper ground strap connection.