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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seating System - 3RD Row >> Diagnosis And Testing >> Seating >> Pinpoint Tests >> PINPOINT TEST B : Seat Latch Motor and Latch Switch Functional Test - RH >> PINPOINT TEST B : Seat Latch Motor and Latch Switch Functional Test - RH

PINPOINT TEST B : Seat Latch Motor and Latch Switch Functional Test - RH

NOTE: Do not carry out this pinpoint test unless directed to do so from the Symptom Chart: Seating - Power-Fold Preliminary Inspection.
NOTE: Verify good battery condition before diagnosing the PFSM system. Poor battery condition may interfere with PFSM operation. If battery voltage drops below 10 volts, seat movement will not start. If battery voltage drops below 8 volts, a started seat movement will stop.
NOTE: The battery saver relay system will time-out after 10 minutes and disable the third row power seat operation. Meter voltage measurements will be inaccurate when this occurs, which could lead to misdiagnosis. To enable the battery saver relay system during diagnosis and testing, close and open any vehicle door.

  1. B1 CHECK FOR AUDIBLE SEAT LATCH OPERATION

    • Select the RH seat switch position and press the NORMAL or FOLD button.
    • Press the STOW button and observe and listen for latch motor operation.

    Does the latch motor operate or is audible? 

    Yes  GO to  B6.
    No  GO to  B2.
    2. NOTE: The following pinpoint test uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this article. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

  2. B2 CHECK THE PFSM FOR OUTPUT VOLTAGE TO THE RH SEAT LATCH MOTOR
    • Access the PFSM. If necessary, to release an inoperative latch or to reposition an inoperative power-stow motor, Refer to Power-Fold Seat Module (PFSM) .
    • Verify the vehicle is in PARK and the liftgate is open.
    • Verify the courtesy lights are on. If needed, close and open any door on the vehicle.
      NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list in this article. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while making sure that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      PFSM C4250A-4 Test Light PFSM C4250A-6
    • Press the STOW button and monitor the test light.

    Does the test light illuminate momentarily when the STOW button is pressed? 

    Yes  GO to  B3.
    No  GO to  B4.

  3. B3 CHECK THE RH SEAT LATCH MOTOR CIRCUITS FOR AN OPEN

    • Disconnect: RH Latch Motor.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4250A-4
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4244-1
      C4250A-6
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4244-2

    Are the resistances less than 3 ohms? 

    Yes  INSTALL a new RH power seat latch. Refer to Seat Latch - Power .
    No  REPAIR the affected circuit(s).

  4. B4 CHECK THE RH SEAT LATCH MOTOR AND CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4250A-4
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B12.
    No  GO to  B5.

  5. B5 CHECK THE RH SEAT LATCH MOTOR CIRCUIT FOR A SHORT TO GROUND

    • Disconnect: RH Latch Motor.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4250A-4
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  INSTALL a new RH power seat latch. Refer to Seat Latch - Power .
    No  REPAIR the circuit.

  6. B6 CHECK THE RH SEAT LATCH SWITCH AND CIRCUITS FOR A SHORT TO GROUND OR SHORT TOGETHER

    • With the latch released, measure the resistance:
      Positive Lead Measurement / Action Negative Lead
      C4250A-11
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C4250A-11
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4250A-12

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  B8.
    No  GO to  B7.

  7. B7 CHECK THE RH SEAT LATCH SWITCH CIRCUITS FOR A SHORT TO GROUND OR SHORT TOGETHER

    • Disconnect: RH Latch Switch.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4250A-11
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C4250A-11
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4250A-12

    Are the resistances greater then 10, 000 ohms? 

    Yes  INSTALL a new RH power seat latch. Refer to Seat Latch - Power .
    No  REPAIR the affected circuit(s).

  8. B8 CHECK THE RH SEAT LATCH SWITCH AND CIRCUITS FOR AN OPEN

    • Use a suitable tool and manually lock the latch.
    • With the latch locked, measure:
      Positive Lead Measurement / Action Negative Lead
      C4250A-11
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4250A-12

    Is the resistance less than 3 ohms? 

    Yes  GO to  B10.
    No  GO to  B9.

  9. B9 CHECK THE RH SEAT LATCH SWITCH CIRCUITS FOR AN OPEN

    • Disconnect: RH Latch Switch.

    Are the resistances less than 3 ohms? 

    Yes  INSTALL a new RH power seat latch. Refer to Seat Latch - Power .
    No  REPAIR the affected circuit(s).
    10. NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list in this article. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while making sure that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.

  10. B10 CHECK THE RH SEAT LATCH SWITCH CIRCUIT FOR VOLTAGE AT THE PFSM
    • Verify the vehicle is in PARK and the liftgate is open.
    • Verify the courtesy lights are on. If needed, close and open any door on the vehicle.
      NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list in this article. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while making sure that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      PFSM C4250A-11
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 PFSM C4250A-12
    • Press the STOW button to release the latch and measure the voltage.

    Is the voltage greater than 11 volts when the STOW button is pressed? 

    Yes  The latch assembly checks OK. GO to  B11.
    No  GO to  B12.

  11. B11 IDENTIFY THE SEAT FUNCTION(S) USING THE TABLE AND DETERMINE THE DIAGNOSTIC DIRECTION

    • Reconnect all disconnected electrical connectors.
    • Operate the seat to each position (NORMAL, STOW, and FOLD) allowing the seat to complete each selection and note all resulting seat movements and seat positions obtained.
    • Compare the step results to the table and determine the diagnostic direction.
      Originating Seat Position Only Seat Position Obtained Components and Circuits to Check
      NORMAL FOLD Check the power-stow seat motor, stow sensor and circuits. GO to Pinpoint Test D .
      NORMAL None (attempts power-stow seat motor movement but no power-fold seat motor (backrest) movement) Check the power-fold seat motor, fold sensor and circuits. GO to Pinpoint Test F .
      STOW FOLD Check the power-fold seat motor, fold sensor and circuits. GO to Pinpoint Test F .
      STOW None (power-fold seat motor (backrest) may attempt movement) Check the power-stow seat motor, stow sensor and circuits. GO to Pinpoint Test D .
      FOLD NORMAL Check the power-stow seat motor, stow sensor and circuits. GO to Pinpoint Test D .
      FOLD STOW Check the power-fold seat motor, fold sensor and circuits. GO to Pinpoint Test F .

    Does the seat operate correctly? 

    Yes  The fault is not present and cannot be recreated at this time. Do not install any new components at this time. Components must only be installed when directed to do so in the pinpoint test. GO to  B12.
    No  To check the power-stow seat motor, stow sensor and circuits, GO to Pinpoint Test D . To check the power-fold seat motor (backrest), fold sensor and circuits, GO to Pinpoint Test F .

  12. B12 CHECK PFSM CONNECTORS AND PINS FOR DAMAGE AND RETEST THE SYSTEM

    • Disconnect and inspect all PFSM connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins as necessary
      • pushed-out pins - install new pins as necessary
    • Reconnect all previously disconnected electrical connectors.
    • Operate the seats and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new PFSM. Refer to Power-Fold Seat Module (PFSM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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