Pinpoint Test B: The Rear Window Wiper Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK CIRCUITS 1002 (BK/PK) AND 406 (BN/WH) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Rear Window Wiper Motor C4171.
- Key in ON position.
- Measure the voltage between rear window wiper motor C4171-8, circuit 1002 (BK/PK), harness side and ground; and between rear window wiper motor C4171-6, circuit 406 (BN/WH), harness side and ground.
  
  Fig 1: Checking Circuits 1002 (BK/PK) And 406 (BN/WH) For Voltage
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : GO to B2.
- No : REPAIR the circuit(s) in question. TEST the system for normal operation.
B2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between rear window wiper C4171-5, circuit 1205 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between Rear Window Wiper C4171-5, Circuit 1205 (BK) And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to B3.
- No : REPAIR the circuit(s) in question. TEST the system for normal operation.
B3 CHECK THE STEERING COLUMN MULTIFUNCTION SWITCH
- Key in OFF position.
- Disconnect: Steering Column Multifunction Switch C202a.
- Carry out the steering column multifunction switch component test. Refer to COMPONENT TESTING article.
- Did the steering column multifunction switch pass the component test?
- Yes : GO to B4.
- No : INSTALL a new steering column multifunction switch. REFER to STEERING COLUMN SWITCHES .
B4 CHECK CIRCUIT 1302 (WH/LG) FOR AN OPEN
- Measure the resistance between steering column multifunction switch C202a-4, circuit 1302 (WH/LG), harness side and ground.
  
  Fig 3: Checking Circuit 1302 (WH/LG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to B5.
- No : REPAIR the circuit. TEST the system for normal operation.
B5 CHECK CIRCUITS 410 (WH/OG) AND 411 (BK/LB) FOR OPENS
- Measure the resistance between steering column multifunction switch C202a-8, circuit 410 (WH/OG) harness side and rear window wiper motor C4171-4, circuit 410 (WH/OG) harness side; and between steering column multifunction switch C202a-2, circuit 411 (BK/LB) harness side rear window wiper motor C4171-3, circuit 411 (BK/LB) harness side.
  
  Fig 4: Checking Circuits 410 (WH/OG) And 411 (BK/LB) For Opens
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to B6.
- No : REPAIR the circuit(s) in question. TEST the system for normal operation.
B6 CHECK FOR CORRECT WIPER MOTOR OPERATION
- Disconnect all wiper motor connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all wiper motor connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : GO to B7.
- 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.
B7 CHECK THE REAR WINDOW WIPER MOTOR
- Carry out the rear window wiper motor component test as outlined in this article.
- Did the rear window wiper motor pass the component test?
- Yes : The system is operating correctly at this time. Concern may have been caused by binding or incorrect pivot arm adjustment. TEST the system for normal operation.
- No : INSTALL a new rear window wiper motor. REFER to REAR WINDOW WIPER MOTOR .