Pinpoint Test D: The Rear Window Wiper Stays On Continuously

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

D1 CHECK THE WIPER SWITCH
- Disconnect: Wiper Switch C202b.
- Carry out the wiper switch component test. Refer to COMPONENT TESTING article for component testing.
- Did the wiper switch pass the component test?
Yes: GO to D2.

No: INSTALL a new wiper switch. REFER to REMOVAL AND INSTALLATION .
D2 CHECK WIPER SWITCH CIRCUIT 1205 (BK) FOR OPEN
- Measure the resistance between wiper switch C202b-2, circuit 1205 (BK), harness side and ground.
  
  Fig 1: Measuring Resistance Between Wiper Switch C202b-2, Circuit 1205 (BK), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to D3.

No: REPAIR the circuit. TEST the system for normal operation.
D3 CHECK CIRCUITS 485 (PK/BK) AND 488 (DG) FOR SHORTS
- Measure the resistance between the rear window wiper motor C476-2, circuit 488 (DG), harness side and ground; and between the rear window wiper motor C476-7, circuit 485 (PK/BK), harness side and ground.
  
  Fig 2: Checking Circuits 485 (PK/BK) & 488 (DG)
  Courtesy of FORD MOTOR CO.
- Are both resistances greater than 10,000 ohms?
Yes: GO to D4.

No: REPAIR the circuit(s). TEST the system for normal operation.
D4 CHECK FOR CORRECT REAR WINDOW WIPER MOTOR OPERATION
- Disconnect the rear window wiper motor connector.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the rear window wiper motor connectors and make sure they are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes: INSTALL a new rear window wiper motor. Refer to WIPER MOTOR - WINDSHIELD . TEST the system for normal operation.

No: The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.