Is the resistance greater than 10,000 ohms?
Yes
GO to H7.
No
REPAIR Circuit 1319 (VT/WH). REPEAT the FEM self-test, CLEAR the DTCs.
H7 CHECK THE CIRCUIT 1319 (VT/WH) FOR OPEN
Measure the resistance between FEM C191 Pin 3, Circuit 1319 (VT/WH), harness side and wiper HI/LOW relay
Pin 1, Circuit 1319 (VT/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to H8.
No
REPAIR Circuit 1319 (VT/WH). REPEAT the FEM self-test, CLEAR the DTCs.
H8 CHECK CIRCUIT 65 (DG) FOR OPEN
FEM C191
Measure the voltage between wiper HI/LOW relay Pin 1, Circuit 65 (DG), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to H9.
No
REPAIR Circuit 65 (DG). REPEAT the FEM self-test, CLEAR the DTCs.
H9 CHECK CIRCUIT 589 (OG) FOR OPEN
Wiper ON/OFF Relay
Measure the resistance between wiper HI/LOW relay Pin 3, Circuit 589 (OG), harness side and wiper ON/OFF
relay circuit 589 (OG), harness side.
2000 Windstar Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYW/~MUS~LEN/21/S