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Pinpoint Test B: The Wipers Are Inoperative - Rear Window

  1. B1 CHECK FOR BCM DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self-Test - BCM.
    • Are any BCM DTCs present? 
  2. B2 CHECK THE BCM PID REAR WIPER INPUT SWITCH STATUS (R_WP-SW) 
    • Enter the following diagnostic mode on the scan tool: DataLogger - BCM.
    • Monitor the BCM PID R_WP-SW while operating the wiper/washer switch in the rear wiper mode.
    • Does the status of the PID match the wiper/washer switch setting? 
    • Yes  : GO to  B5.
    • No  : GO to  B3.
  3. B3 CHECK THE WIPER/WASHER SWITCH 
    • Ignition OFF.
    • Disconnect: Wiper/Washer Switch C2081.
    • Carry out the wiper/washer switch component test.

      Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for component testing.

    • Does the wiper/washer switch pass the component test? 
    • Yes  : GO to  B4.
    • No  : INSTALL a new wiper/washer switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
  4. B4 CHECK THE WIPER GROUND CIRCUIT FROM THE BCM AND THE REAR WIPER INTERVAL CIRCUIT 
    • Disconnect: BCM C2280E.
    • Disconnect: BCM C2280F.
    • Measure the resistance between wiper/washer switch C2081-4, circuit CRW20 (GY/YE), harness side and BCM C2280E-5, circuit CRW20 (GY/YE), harness side and between wiper/washer switch C2081-5, circuit CRW17 (GN/VT), harness side and BCM C2280F-16, circuit CRW17 (GN/VT), harness side.
      Fig 1: Measuring Resistance Between Wiper/Washer Switch C2081-4, Circuit CRW20 (GY/YE) And BCM C2280E-5, Circuit CRW20 (GY/YE)
      G07981512Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  B5.
    • No  : REPAIR the affected circuit. TEST the system for normal operation.
  5. B5 CHECK THE REAR WINDOW WIPER MOTOR GROUND FOR AN OPEN OR HIGH RESISTANCE 
    • Ignition OFF.
    • Disconnect: Rear Window Wiper Motor C4218.
    • Measure the resistance between rear window wiper motor C4218-3, circuit GD143 (BK/VT), harness side and ground.
      Fig 2: Measuring Resistance Between Rear Window Wiper Motor C4218-3, Circuit GD143 (BK/VT), Harness Side And Ground
      G07981513Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  B6.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. B6 CHECK THE BCM VOLTAGE 
    • Disconnect: BCM C2280B.
    • Ignition ON.
    • Measure the voltage between BCM C2280B-15, circuit CBP13 (GY/BN), harness side and ground.
      Fig 3: Measuring Voltage Between BCM C2280B-15, Circuit CBP13 (GY/BN), Harness Side And Ground
      G07981514Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  B7.
    • No  : VERIFY Central Junction Box (CJB) fuse 13 (15A) is OK. If OK, REPAIR circuit CBP13 (GY/BN) for an open or high resistance. If not OK, REFER to the for schematic and connector information in OEM WIRING DIAGRAMS to identify the possible causes of the short to ground.
  7. B7 CHECK REAR WINDOW WIPER MOTOR SUPPLY AND RELAY OUTPUT CIRCUITS FOR AN OPEN OR HIGH RESISTANCE 
    • Ignition OFF.
    • Disconnect: BCM C2280C.
    • Measure the resistance between rear window wiper motor C4218-1, circuit CRW02 (GY/BU), harness side and BCM C2280C-11, circuit CRW02 (GY/BU), harness side and between rear window wiper motor C4218-2, circuit CRW05 (BU), harness side and BCM C2280C-9, circuit CRW05 (BU), harness side.
      Fig 4: Measuring Resistance Between Rear Window Wiper Motor C4218-1, Circuit CRW02 (GY/BU) And BCM C2280C-11, Circuit CRW02 (GY/BU)
      G07981515Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  B8.
    • No  : REPAIR the affected circuit. TEST the system for normal operation.
  8. B8 CHECK FOR VOLTAGE TO THE REAR WINDOW WIPER MOTOR USING THE BCM PID REAR WIPER RELAY (WPR_RLY_REAR) 
    • Connect: BCM C2280B.
    • Connect: BCM C2280C.
    • Connect: BCM C2280E.
    • Connect: BCM C2280F.
    • Connect: Wiper/Washer Switch C2081.
    • Ignition ON.
    • Command the BCM PID WPR_RLY_REAR on.
    • Measure the voltage between rear window wiper motor C4218-1, circuit CRW02 (GY/BU), harness side and ground and between rear window wiper motor C4218-2, circuit CRW05 (BU), harness side and ground.
      Fig 5: Measuring Voltage Between Rear Window Wiper Motor C4218-1, Circuit CRW02 (GY/BU), Harness Side And Ground
      G07981516Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to  B9.
    • No  : GO to  B10.
  9. B9 CHECK FOR CORRECT WIPER MOTOR OPERATION 
    • Ignition OFF.
    • Inspect rear window wiper motor C4218 for the following conditions:
      • corrosion
      • damaged or pushed out pins
    • Connect the rear window wiper motor C4218 and make sure it seats correctly.
    • Operate the system and verify if the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new rear window wiper motor. REFER to Wiper Motor - Rear Window . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
  10. B10 CHECK FOR CORRECT BCM OPERATION 
    • Ignition OFF.
    • Inspect the BCM connectors for the following conditions:
      • corrosion
      • damaged or pushed out pins
    • Connect the BCM connectors and make sure they seat correctly.
    • Connect: Rear Window Wiper Motor C4218.
    • Operate the system and verify if the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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