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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat System - Seats-Seating - 3RD Row >> Diagnostic Routine(S) >> Diagnostic Routine D >> Pinpoint Test

Pinpoint Test

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. CHECK THE PFSM FOR OUTPUT VOLTAGE TO THE POWER-STOW SEAT MOTOR
    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. Refer to SPECIAL TOOL(S) .
    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. Refer to SPECIAL TOOL(S) .
    1. Access the PFSM. To access the PFSM, REFER to Power-Fold Seat Module (PFSM) .
    2. Verify the vehicle is in PARK and the liftgate is open.
    3. Verify the courtesy lights are on. If needed, close and open any door on the vehicle.
    4. Measure:
      PFSM PFSM
      G08039934
      G08039935
      C4250C C4250C
      Pin Circuit Measurement Pin Circuit
      14 CPS72 (WH/OG) Test Light 13 CPS71 (GN/VT)
    5. Press the STOW button and monitor the test light.

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

    • Yes: GO to  4  .
    • No: GO to 2  .
  2. CHECK THE RH POWER-STOW SEAT MOTOR AND CIRCUITS FOR A SHORT TO GROUND
    1. Disconnect: PFSM C4250C.
    2. Measure:
      PFSM Ground
      G08039936
      G08039937
      C4250C Ground
      Pin Circuit Measurement Pin Circuit
      14 CPS72 (WH/OG)
      G08039938
      		 - Ground
      13 CPS71 (GN/VT)
      G08039939
      		 - Ground

    Are the resistances greater than 10, 000 ohms? 

    • Yes: GO to  10  .
    • No: GO to 3  .
  3. CHECK THE RH POWER-STOW SEAT MOTOR AND CIRCUITS FOR A SHORT TO GROUND
    1. Disconnect: RH Power-Stow Seat Motor.
    2. Measure:
      PFSM Ground
      G08039940
      G08039941
      C4250C Ground
      Pin Circuit Measurement Pin Circuit
      14 CPS72 (WH/OG)
      G08039942
      		 - Ground
      13 CPS71 (GN/VT)
      G08039943
      		 - Ground

    Are the resistances greater than 10, 000 ohms? 

    • Yes: INSTALL a new RH power-stow seat motor. REFER to Power-Stow Seat Motor .
    • No: REPAIR the affected circuit(s).
  4. CHECK THE RH POWER-STOW SEAT MOTOR AND CIRCUITS FOR AN OPEN
    1. Disconnect: PFSM C4250C.
    2. Measure:
      PFSM PFSM
      G08039944
      G08039945
      C4250C C4250C
      Pin Circuit Measurement Pin Circuit
      14 CPS72 (WH/OG)
      G08039946
      		 13 CPS71 (GN/VT)

    Is the resistance less than 5 ohms? 

    • Yes: GO to  6  .
    • No: GO to 5  .
  5. CHECK THE RH POWER-STOW SEAT MOTOR CIRCUITS FOR AN OPEN
    1. Disconnect: RH Power-Stow Seat Motor.
    2. Measure:
      PFSM RH Power-Stow Seat Motor
      G08039947
      G08039948
      C4250C C4182
      Pin Circuit Measurement Pin Circuit
      14 CPS72 (WH/OG)
      G08039949
      		 3 CPS72 (WH/OG)
      13 CPS71 (GN/VT)
      G08039950
      		 1 CPS71 (GN/VT)

    Are the resistances less than 3 ohms? 

    • Yes: INSTALL a new RH power-stow seat motor. REFER to Power-Stow Seat Motor .
    • No: REPAIR the affected circuit(s).
  6. CHECK THE PFSM FOR OUTPUT VOLTAGE TO THE STOW SENSOR
    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. Refer to SPECIAL TOOL(S) .
    1. Connect: PFSM C4250C.
    2. Verify the vehicle is in PARK and the liftgate is open.
    3. Verify the courtesy lights are on. If needed, close and open any door on the vehicle.
    4. Measure:
      PFSM PFSM
      G08039951
      G08039952
      C4250B C4250B
      Pin Circuit Measurement Pin Circuit
      3 LPS77 (YE/GY)
      G08039953
      		 1 RPS77 (BN/GN)

    Is the voltage greater than 5 volts? 

    • Yes: GO to  9  .
    • No: GO to 7  .
  7. CHECK THE RH POWER-STOW SEAT MOTOR SENSOR AND CIRCUIT FOR A SHORT TO GROUND
    1. Disconnect: PFSM C4250B.
    2. Disconnect: RH Power-Fold Seat Motor.
    3. Measure:
      PFSM Ground
      G08039954
      G08039955
      C4250B Ground
      Pin Circuit Measurement Pin Circuit
      3 LPS77 (YE/GY)
      G08039956
      		 - Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes: GO to  10  .
    • No: GO to 8  .
  8. CHECK THE RH POWER STOW SEAT MOTOR SENSOR CIRCUIT FOR A SHORT TO GROUND
    1. Disconnect: RH Power-Stow Seat Motor.
    2. Measure:
      PFSM Ground
      G08039957
      G08039958
      C4250B Ground
      Pin Circuit Measurement Pin Circuit
      3 LPS77 (YE/GY)
      G08039959
      		 - Ground
      1 RPS77 (BN/GN)
      G08039960
      		 - Ground

    Are the resistances greater than 10, 000 ohms? 

    • Yes: INSTALL a new RH power-stow seat motor. REFER to Power-Stow Seat Motor .
    • No: REPAIR the affected circuit.
  9. CHECK THE RH POWER-STOW SEAT MOTOR SENSOR CIRCUITS FOR AN OPEN
    1. Disconnect: RH Power-Stow Seat Motor.
    2. Disconnect: PFSM C4250B.
    3. Measure:
      PFSM RH Power-Stow Seat Motor
      G08039961
      G08039962
      C4250B C4182
      Pin Circuit Measurement Pin Circuit
      3 LPS77 (YE/GY)
      G08039963
      		 2 LPS77 (YE/GY)
      1 RPS77 (BN/GN)
      G08039964
      		 4 RPS77 (BN/GN)

    Are the resistances less than 3 ohms? 

    • Yes: INSTALL a new RH power-stow seat motor. REFER to Power-Stow Seat Motor .
    • No: REPAIR the affected circuit(s).
  10. CHECK PFSM CONNECTORS AND PINS FOR DAMAGE AND RETEST THE SYSTEM
    1. Disconnect and inspect all PFSM connectors.
    2. 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
    3. Reconnect all previously disconnected electrical connectors.
    4. 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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