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Pinpoint Test I: The Wash And Wipe Function Is Inoperative - Rear

  1. I1 CHECK THE LIFTGATE AJAR PARAMETER IDENTIFICATION (PID) 
    • Monitor the liftgate ajar PID while opening and closing the liftgate.
    • Does the liftgate ajar PID agree with the liftgate position? 
    1. YES  : Go to  I2.
    2. NO  : REFER to INTERIOR LIGHTING article to diagnose the liftgate ajar circuit.
  2. I2 CHECK LIFTGATE AJAR CIRCUIT 700 (WH/PK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Smart Junction Box (SJB) C2280c
    • Disconnect: Liftgate Ajar Switch C479
      • Fig 1: Checking Circuit For Open
      GF0016641Courtesy of FORD MOTOR CO.
    • Using the following table, measure the resistance between SJB C2280c, rear window wiper motor C476, and liftgate ajar switch C479 harness side:
      SJB C2280c Liftgate Ajar Switch C479 Rear Window Wiper Motor C476
      C2280c-5, circuit 700 (WH/PK) C479-C, circuit 700 (WH/PK) -
      C2280c-5, circuit 700 (WH/PK) - C476-3, circuit 700 (WH/PK)
      - C479-C, circuit 700 (WH/PK) C476-3, circuit 700 (WH/PK)
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  I3.
    2. NO  : REPAIR the circuit(s) in question. TEST the system for normal operation.
  3. I3 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? 
    1. YES  : Go to  I4.
    2. NO  : INSTALL a new wiper switch. REFER to STEERING COLUMN SWITCHES article.
  4. I4 CHECK WIPER SWITCH CIRCUIT 1205 (BK) FOR OPEN 
    • Measure the resistance between wiper switch C202a-7, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. I5 CHECK CIRCUIT 485 (PK/BK) FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0016650Courtesy of FORD MOTOR CO.
    • Measure the resistance between wiper switch C202b-10, circuit 485 (PK/BK), harness side and C476-7, circuit 485 (PK/BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. I6 CHECK FOR CORRECT REAR WINDOW WIPER MOTOR OPERATION 
    • Disconnect all rear window wiper motor connectors.
    • 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? 
    1. YES  : INSTALL a new rear window wiper motor. REFER to Wiper Motor - Rear Window . TEST the system for normal operation.
    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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