Pinpoint Test D: The Rear Window Wiper Stays On Continuously: Testing
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 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 C202a.
Carry out the wiper switch component test. Refer to COMPONENT TESTING .
- Did the wiper switch pass the component test?
- Yes : GO to D2.
- No : INSTALL a new wiper switch. REFER to STEERING COLUMN SWITCHES .
- Disconnect: Wiper Switch C202a.
- D2 CHECK WIPER SWITCH CIRCUIT 1205 (BK) FOR OPEN
- Measure the resistance between wiper switch C202a-2, circuit 1205 (BK), harness side and ground.
- 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.
- 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 WINDSHIELD WIPER MOTOR . 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.