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Pinpoint Test V: The Washer Pump Is Inoperative

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. V1 CHECK THE WASHER PUMP MOTOR FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Washer Pump Motor C137.
    • Key in ON position.
    • Measure the voltage between the washer pump motor C137-2, circuit 75S-KA7 (YE/VT) harness side and ground while pressing the multifunction switch to the wash position.
      Fig 1: Measuring Voltage Between Washer Pump Motor C137-2, Circuit 75S-Ka7 (YE/VT) Harness Side
      G03203525Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to V2.
    2. No  : GO to  V3.
  2. V2 CHECK CIRCUIT 31-KA7 (BK) FOR GROUND 
    • Measure the resistance between the washer pump motor C137-1, circuit 31-KA7 (BK) harness side and ground.
      Fig 2: Measuring Resistance Between Washer Pump Motor C137-1, Circuit 31-KA7 (BK) Harness Side And Ground
      G03203526Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new washer pump. REFER to WINDSHIELD WASHER PUMP AND RESERVOIR .
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  3. V3 CHECK CIRCUIT 75S-KA7 (YE/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Windshield Wiper Motor C125.
    • Measure the resistance between C125-7, circuit 75S-KA7 (YE/VT), harness side and C137-2, circuit 75S-KA7 (YE/VT), harness side.
      Fig 3: Measuring Resistance Between C125-7, Circuit 75S-KA7 (YE/VT), Harness Side
      G03203527Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : go to V4.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  4. V4 CHECK THE MULTIFUNCTION SWITCH 
    • Key in OFF position.
    • Disconnect: Multifunction Switch C202.
    • Carry out the multifunction switch component test.

      Refer to COMPONENT TESTING .

    • Did the multifunction switch pass the component test? 
    1. Yes  : GO to V5.
    2. No  : INSTALL a new multifunction switch. REFER to STEERING SYSTEM for the removal and installation procedure.
  5. V5 CHECK CIRCUIT 31-KA19 (BK/RD) FOR AN OPEN 
    • Measure the resistance between the multifunction switch C202-2, circuit 31-KA19 (BK/RD), harness side and ground.
      Fig 4: Measuring Resistance Between Multifunction Switch C202-2, Circuit 31-KA19 (BK/RD)
      G03203528Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to V6.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  6. V6 CHECK CIRCUIT 8-KA7 (WH/VT) FOR AN OPEN 
    • Measure the resistance between the multifunction switch C202-5, circuit 8-KA7 (WH/VT), harness side and the windshield wiper motor C125-12, circuit 8-KA7 (WH/VT), harness side.
      Fig 5: Measuring Resistance Between Multifunction Switch C202-5, Circuit 8-KA7 (WH/VT)
      G03203529Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to V7.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  7. V7 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? 
    1. Yes  : go to V8.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
  8. V8 CHECK THE WINDSHIELD WIPER MOTOR 
    • Key in OFF position.
    • Disconnect: Windshield Wiper Motor C125.
    • Carry out the windshield wiper motor component test as described.
    • Did the windshield wiper motor pass the component test? 
    1. Yes  : The system is operating correctly at this time. The concern may have been caused by binding or incorrect pivot arm adjustment. REFER to WINDSHIELD WIPER . TEST the system for normal operation.
    2. No  : INSTALL a new windshield wiper motor. REFER to WINDSHIELD WIPER .
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