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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 F >> 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-FOLD 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
      G08039996
      G08039997
      C4250B C4250B
      Pin Circuit Measurement Pin Circuit
      4 CPS44 (GY/BN) Test Light 2 CPS45 (VT/OG)
    5. Press the NORMAL button, then the FOLD button, and monitor the test light and allow the seat to complete any movement.
    6. If the seat is already in the normal position, press the FOLD button instead.

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

    • Yes: GO to  4  .
    • No: GO to 2  .
  2. CHECK THE RH POWER-FOLD SEAT MOTOR AND CIRCUITS FOR A SHORT TO GROUND
    1. Disconnect: PFSM C4250B.
    2. Measure:
      PFSM Ground
      G08039998
      G08039999
      C4250B Ground
      Pin Circuit Measurement Pin Circuit
      4 CPS44 (GY/BN)
      G08040000
      		 - Ground
      2 CPS45 (VT/OG)
      G08040001
      		 - Ground

    Are the resistances greater than 10, 000 ohms? 

    • Yes: GO to  10  .
    • No: GO to 3  .
  3. CHECK THE RH POWER-FOLD SEAT MOTOR AND CIRCUITS FOR A SHORT TO GROUND
    1. Disconnect: RH Power-Fold Seat Motor.
      • Remove the backrest latch outer cover to gain access to the RH power-fold seat motor electrical connector. REFER to Seat - Exploded View .
    2. Measure:
      PFSM Ground
      G08040002
      G08040003
      C4250B Ground
      Pin Circuit Measurement Pin Circuit
      4 CPS44 (GY/BN)
      G08040004
      		 - Ground
      2 CPS45 (VT/OG)
      G08040005
      		 - Ground

    Are the resistances greater than 10, 000 ohms? 

    • Yes: INSTALL a new power-fold seat motor. REFER to Power-Fold Seat Motor .
    • No: REPAIR the affected circuit(s).
  4. CHECK THE RH POWER-FOLD SEAT MOTOR AND CIRCUITS FOR AN OPEN
    1. Disconnect: PFSM C4250B.
      2. NOTE: Typical motor resistance is 1.5 ohms.
    2. Measure:
      PFSM PFSM
      G08040006
      G08040007
      C4250B C4250B
      Pin Circuit Measurement Pin Circuit
      4 CPS44 (GY/BN)
      G08040008
      		 2 CPS45 (VT/OG)

    Is the resistance less than 5 ohms? 

    • Yes: GO to  6  .
    • No: GO to 5  .
  5. CHECK THE RH POWER-FOLD SEAT MOTOR CIRCUITS FOR AN OPEN
    1. Disconnect: RH Power-Fold Seat Motor.
      • Remove the backrest latch outer cover to gain access to the RH power-fold seat motor electrical connector. REFER to Seat - Exploded View .
    2. Measure:
      PFSM RH Power-Fold Seat Motor
      G08040009
      G08040010
      C4250B C4246
      Pin Circuit Measurement Pin Circuit
      4 CPS44 (GY/BN)
      G08040011
      		 3 CPS44 (GY/BN)
      2 CPS45 (VT/OG)
      G08040012
      		 1 CPS45 (VT/OG)

    Are the resistances less than 3 ohms? 

    • Yes: INSTALL a new RH power-fold seat motor. REFER to Power-Fold Seat Motor .
    • No: REPAIR the affected circuit(s).
  6. CHECK THE PFSM FOR OUTPUT VOLTAGE TO THE FOLD 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 C4250B.
    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
      G08040013
      G08040014
      C4250B C4250B
      Pin Circuit Measurement Pin Circuit
      5 LPS78 (VT)
      G08040015
      		 1 RPS77 (BN/GN)

    Is the voltage greater than 5 volts? 

    • Yes: GO to  9  .
    • No: GO to 7  .
  7. CHECK THE RH POWER-FOLD SEAT MOTOR SENSOR AND CIRCUITS FOR A SHORT TO GROUND
    1. Disconnect: PFSM C4250B.
    2. Disconnect: RH Power-Stow Seat Motor.
      • Remove the backrest latch outer cover to gain access to the RH power-stow seat motor electrical connector. REFER to Seat - Exploded View .
    3. Measure:
      PFSM Ground
      G08040016
      G08040017
      C4250B Ground
      Pin Circuit Measurement Pin Circuit
      5 LPS78 (VT)
      G08040018
      		 - Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes: GO to  10  .
    • No: GO to 8  .
  8. CHECK THE RH POWER-FOLD SEAT MOTOR SENSOR CIRCUITS FOR A SHORT TO GROUND
    1. Disconnect: RH Power-Fold Seat Motor.
      • Remove the backrest latch outer cover to gain access to the power-fold seat motor electrical connector. REFER to Seat - Exploded View .
    2. Measure:
      PFSM Ground
      G08040019
      G08040020
      C4250B Ground
      Pin Circuit Measurement Pin Circuit
      5 LPS78 (VT)
      G08040021
      		 - Ground
      1 RPS77 (BN/GN)
      G08040022
      		 - Ground

    Are the resistances greater than 10, 000 ohms? 

    • Yes: INSTALL a new RH power-fold seat motor. REFER to Power-Fold Seat Motor .
    • No: REPAIR the affected circuit.
  9. CHECK THE RH POWER-FOLD SEAT MOTOR SENSOR CIRCUITS FOR AN OPEN
    1. Disconnect: RH Power-Fold Seat Motor.
      • Remove the backrest latch outer cover to gain access to the power-fold seat motor electrical connector. REFER to Seat - Exploded View .
    2. Disconnect: PFSM C4250B.
    3. Measure:
      PFSM RH Power-Fold Seat Motor
      G08040023
      G08040024
      C4250B C4246
      Pin Circuit Measurement Pin Circuit
      5 LPS78 (VT)
      G08040025
      		 2 LPS78 (VT)
      1 RPS77 (BN/GN)
      G08040026
      		 4 RPS77 (BN/GN)

    Are the resistances less than 3 ohms? 

    • Yes: INSTALL a new RH power-fold seat motor. REFER to Power-Fold 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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