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Pinpoint Test A: The Wipers Are Inoperative - Windshield

  1. A1 CHECK CIRCUIT CRW03 (VT/WH) FOR VOLTAGE 
    • Disconnect: Wiper Motor C125
    • Key in ON position.
    • Measure the voltage between windshield wiper motor C125-5, circuit CRW03 (VT/WH), harness side and ground; and between windshield wiper motor C125-8, circuit CRW03 (VT/WH), harness side and ground.
      • Fig 1: Checking Circuit For Voltage
      GF0002073Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  A6.
    2. NO  : Go to  A2.
  2. A2 CHECK THE WIPER RUN/PARK RELAY 
    • Key in OFF position.
    • Disconnect: Wiper Run/Park Relay
    • Carry out the Wiper Run/Park Relay Component Test. Refer to appropriate COMPONENT TESTING article article.
    • Did the wiper run/park relay pass the component test? 
    1. YES  : Go to  A3.
    2. NO  : INSTALL a new wiper run/park relay. TEST the system for normal operation.
  3. A3 CHECK CIRCUIT CBP45 (YE) FOR VOLTAGE 
    • Key in ON position.
    • Measure the voltage between wiper run/park relay pin 85, circuit CBP45 (YE), harness side and ground.
      • Fig 2: Measuring Voltage
      GF0045496Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A4.
    2. NO  : VERIFY smart junction box (SJB) fuse 45 (5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT SBB03 (BU/RD) FOR VOLTAGE 
    • Measure the voltage between wiper run/park relay pin 30, circuit SBB03 (BU/RD), harness side and ground.
      • Fig 3: Measuring Voltage
      GF0045497Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A5.
    2. NO  : VERIFY battery junction box (BJB) fuse 3 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK WIPER RUN/PARK CIRCUIT GD120 (BK/GN) FOR GROUND 
    • Measure the resistance between wiper run/park relay pin 86, circuit GD120 (BK/GN), and ground.
      • Fig 4: Measuring Resistance
      GF0045498Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR open in circuit CRW03 (VT/WH). TEST the system for normal operation.
    2. NO  : REPAIR open in circuit GD120 (BK/GN). TEST the system for normal operation.
  6. A6 CHECK CIRCUITS GD123 (BK/GY) AND GD120 (BK/GN) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between windshield wiper C125-6, circuit GD120 (BK/GN), harness side and ground; and between windshield wiper motor C125-3, circuit GD123 (BK/GY), harness side and ground.
      • Fig 5: Checking Circuit For Open
      G03880805Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR the circuit(s). TEST the system for normal operation.
  7. A7 CHECK THE WIPER SWITCH 
    • Disconnect: Multi-Function Switch C202
    • Carry out the Multi-Function Switch Component Test. Refer to appropriate COMPONENT TESTING article.
    • Did the multi-function switch pass the component test? 
    1. YES  : Go to  A8.
    2. NO  : INSTALL a new multi-function switch. REFER to STEERING COLUMN SWITCHES article.
  8. A8 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN 
    • Measure the resistance between multi-function switch C202-15, circuit GD111 (BK/BU), harness side and ground.
      • Fig 6: Measuring Resistance Between Multi-Function Switch C202-15, Circuit GD116 (BK/VT) & Ground
      GF0026528Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. A9 CHECK FOR A SHORT IN THE WINDSHIELD WIPER MOTOR HARNESS 
    • Measure the resistance at the windshield wiper motor electrical connector between the circuits shown in the chart.
      Windshield Wiper Motor C125 Windshield Wiper Motor C125
      Pin 10, circuit CRW19 (BU/OG) Pin 11, circuit CRW18 (VT/WH)
        Pin 1, circuit CRW08 (VT/OG)
        Pin 9, circuit CRW17 (GN/VT)
      Pin 11, circuit CRW18 (VT/WH) Pin 1, circuit CRW08 (VT/OG)
        Pin 9, circuit CRW17 (GN/VT)
      Pin 1, circuit CRW08 (VT/OG) Pin 9, circuit CRW17 (GN/VT)
    • Is the resistance greater than 10,000 ohms for all measurements? 
    1. YES  : Go to  A10.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  10. A10 CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION 
    • Disconnect all windshield wiper motor connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the windshield wiper motor connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield .
    2. 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.
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