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Pinpoint Test I : One Or More Rear Wiper Modes Are Inoperative

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. I1 CHECK THE MULTIFUNCTION SWITCH PIDs

    • Ignition ON.
    • Using a diagnostic scan tool, view the SCCM PIDs.
    • Using a diagnostic scan tool, monitor the following SCCM PIDs :
      • Rear Wiper Delay 1 (R_WIPE_DEL1)
      • Rear Wiper Delay 2 (R_WIPE_DEL2)
    • Place the rear window wiper switch to the INT 1 and then INT 2 setting.

    Do the PIDs correspond correctly with the wiper/washer switch settings? 

    Yes  GO to  I2.
    No  INSTALL a new multifunction switch. REFER to Steering Column Switches . If the concern is still present, INSTALL a new SCCM. REFER to Steering Column Switches .

  2. I2 CHECK THE REAR WINDOW WIPER MOTOR RELAY

    • Ignition OFF.
    • Disconnect: Rear Window Wiper Motor Relay.
    • Substitute a known good relay.
    • Ignition ON.
    • Recheck the rear window wiper operation.
    • Ignition OFF.

    Does the rear window wiper operate? 

    Yes  REMOVE the known good relay. INSTALL a new rear window wiper motor relay.
    No  REMOVE the known good relay. GO to  I3.

  3. I3 CHECK THE REAR WINDOW WIPER MOTOR RELAY BATTERY SUPPLIED VOLTAGE CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Rear window wiper motor relay, cavity 3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  I4.
    No  VERIFY the BJB fuse 47 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

  4. I4 CHECK THE REAR WINDOW WIPER MOTOR RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Rear window wiper motor relay, cavity 1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  I5.
    No  REPAIR the circuit.

  5. I5 CHECK THE REAR WINDOW WIPER MOTOR RELAY GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Rear window wiper motor relay, cavity 1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Rear window wiper motor relay, cavity 2

    Is the voltage greater than 11 volts? 

    Yes  GO to  I6.
    No  REPAIR the circuit.

  6. I6 CHECK THE REAR WINDOW WIPER MOTOR VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Connect: Rear Window Wiper Motor Relay.
    • Disconnect: Rear Window Wiper Motor C476 .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C476-1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  I7.
    No  REPAIR the circuit.

  7. I7 CHECK THE REAR WINDOW WIPER MOTOR GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C476-1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 C476-3

    Is the voltage greater than 11 volts? 

    Yes  GO to  I8.
    No  REPAIR the circuit.

  8. I8 CHECK THE WINDSHIELD WIPER MOTOR CONTROL

    NOTE: The following step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250- 300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

    • Ignition OFF.
    • Connect:
      Lead 1 Measurement / Action Lead 2
      C476-1
      GFD134887Courtesy of FORD MOTOR COMPANY
      		 C476-2
    • Ignition ON.
    • Place the rear window wiper switch to the INT 2 setting and observe the test lamp for 30 seconds.

    Does the test lamp flash on and off at a regular interval? 

    Yes  INSTALL a new rear window wiper motor. REFER to Wiper Motor - Rear Window .
    No  GO to  I9.

  9. I9 CHECK THE REAR WINDOW WIPER MOTOR CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Connect: Rear Window Wiper Motor C476 .
    • Disconnect: Windshield Wiper Motor C1656 .
    • Connect:
      Lead 1 Measurement / Action Lead 2
      C1656-11
      GFD135987Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Ignition ON.

    Does the rear window wiper motor operate? 

    Yes  REMOVE the jumper wire. INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield .
    No  REMOVE the jumper wire. REPAIR the circuit.
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