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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System & Washer System >> Diagnosis And Testing >> Wipers and Washers >> Pinpoint Tests >> Pinpoint Test A: The Wipers are Inoperative >> Pinpoint Test A: The Wipers Are Inoperative

Pinpoint Test A: The Wipers Are Inoperative

NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 CHECK THE VOLTAGE TO THE WINDSHIELD WIPER MOTOR 
    • Disconnect: Wiper Motor C125.
    • Ignition ON.
    • Measure the voltage between ground and wiper motor:
      • C125-5, circuit CRW03 (VT/WH), harness side.
      • C125-8, circuit CBP45 (YE), harness side.
        Fig 1: Checking Voltage To Windshield Wiper Motor
        G06071205Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to  A6.
    • No  : GO to A2.
  2. A2 CHECK THE WIPER RELAY 
    • Ignition OFF.
    • Disconnect: Wiper Relay.
    • Carry out the Micro ISO Relay component test for the wiper relay. Refer to COMPONENT TESTING article, for component testing.
    • Did the wiper relay pass the component test? 
    • Yes  : GO to A3.
    • No  : INSTALL a new wiper relay. TEST the system for normal operation.
  3. A3 CHECK THE VOLTAGE TO THE WIPER RELAY COIL 
    • Ignition ON.
    • Measure the voltage between wiper relay socket pin 1, circuit CBP45 (YE), and ground.
      Fig 2: Measuring Voltage Between Wiper Relay Socket Pin 1, Circuit CBP45 (YE), And Ground
      G07797175Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to A4.
    • No  : VERIFY Smart Junction Box (SJB) fuse 45 (5A) is OK. If OK, REPAIR circuit CBP45 (YE) for an open. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short. TEST the system for normal operation.
  4. A4 CHECK THE VOLTAGE TO THE WIPER RELAY SWITCH 
    • Measure the voltage between wiper relay socket pin 5, circuit SBB04 (GN/RD) and ground.
      Fig 3: Measuring Voltage Between Wiper Relay Socket Pin 5, Circuit SBB04 (GN/RD) And Ground
      G06286003Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to A5.
    • No  : VERIFY Battery Junction Box (BJB) fuse 4 (30A) is OK. If OK, REPAIR circuit SBB04 (GN/RD) for an open. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short. TEST the system for normal operation.
  5. A5 CHECK THE GROUND TO THE WIPER RELAY COIL 
    • Ignition OFF.
    • Disconnect the battery ground cable. Refer to BATTERY, BATTERY MOUNTING & BATTERY CABLES article.
    • Measure the resistance between wiper relay socket pin 2, circuit GD120 (BK/GN) and ground.
      Fig 4: Measuring Resistance Between Wiper Relay Socket Pin 2, Circuit GD120 (BK/GN) And Ground
      G06286004Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR open in circuit CRW03 (VT/WH). RECONNECT the battery ground cable. TEST the system for normal operation.
    • No  : REPAIR open in circuit GD120 (BK/GN). RECONNECT the battery ground cable. TEST the system for normal operation.
  6. A6 CHECK THE WIPER MOTOR GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between ground and wiper motor:
      • C125-6, circuit GD120 (BK/GN), harness side.
      • C125-3, circuit GD120 (BK/GN), harness side.
        Fig 5: Measuring Resistance Between Ground And Wiper Motor
        G06077651Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to A7.
    • No  : REPAIR the circuit(s). TEST the system for normal operation.
  7. A7 CHECK THE MULTIFUNCTION SWITCH 
    • Disconnect: Multifunction Switch C202.
    • Carry out the Multifunction Switch component test. Refer to COMPONENT TESTING article, for component testing.
    • Did the multifunction switch pass the component test? 
  8. A8 CHECK THE MULTIFUNCTION SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between multifunction switch C202-15, circuit GD116 (BK/VT), harness side and ground.
      Fig 6: Measuring Resistance Between Multifunction Switch C202- 15, Circuit GD116 (BK/VT) And Ground
      G06071210Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A9.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  9. A9 CHECK FOR CORRECT WIPER MOTOR OPERATION 
    • Disconnect all wiper motor connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the 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  : INSTALL a new wiper motor. REFER to WIPER MOTOR  in this service information.
    • 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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