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Pinpoint Test Y : The Power Seat Is Inoperative - Third Row Power-Fold, Left And Right Seats

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. Y1 CHECK FOR BCM DTCs

    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - BCM.

    Are any BCM DTCs present? 

    Yes  If DTC B1317:11, VERIFY BCM fuse 18 (10A) is OK. If OK, GO to  Y2. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short. if DTC B1317:15, GO to  Y4.For all other BCM DTCs, REFER to Multifunction Electronic Modules .
    No  GO to  Y6.

  2. Y2 CHECK THE BCM OUTPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.
    • Disconnect: BCM C2280C.
    • Disconnect: Third Row Seat Control Switch C3199.
    • Disconnect: PFSM C3677C.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-9 CPS48 (BU) - Ground
    1. GFD137423Courtesy of FORD MOTOR COMPANY

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  Y3.
    No  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

  3. Y3 CHECK THE BCM OUTPUT CIRCUIT FOR VOLTAGE

    • Connect: Third Row Seat Control Switch C3199.
    • Connect: BCM C2280C.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-9 CPS48 (BU) - Ground
    1. GFD137423Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 11 volts? 

    Yes  CONNECT PFSM C3677C. CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test. If DTC B1317:11 returns, INSTALL a new PFSM. REFER to Power-Fold Seat Module (PFSM) .
    No  CONNECT PFSM C3677C. CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test. If DTC B1317:11 returns, BCM Hardware Testing .

  4. Y4 CHECK THE BCM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: BCM C2280C.
    • Disconnect: Third Row Seat Control Switch C3199.
    • Disconnect: PFSM C3677C.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-9 CPS48 (BU) - Ground
    1. GFD137423Courtesy of FORD MOTOR COMPANY

    Is any voltage present? 

    Yes  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    No  GO to  Y5.

  5. Y5 CHECK THE BCM OUTPUT CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-9 CPS48 (BU) C2280C-24 CPS48 (BU)
    1. GFD137424Courtesy of FORD MOTOR COMPANY

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new PFSM. REFER to Power-Fold Seat Module (PFSM) .
    No  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

  6. Y6 CHECK FOR BATTERY VOLTAGE TO THE PFSM

    • Ignition OFF.
    • Disconnect: PFSM C3677A.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677A-1 SBB70 (BN/RD) - Ground
    1. GFD137425Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 11 volts? 

    Yes  GO to  Y7.
    No  VERIFY BJB fuse 70 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

  7. Y7 CHECK THE BCM OUTPUT CIRCUIT FOR VOLTAGE

    • Disconnect: PFSM C3677C.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-9 CPS48 (BU) - Ground
    1. GFD137423Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 11 volts? 

    Yes  GO to  Y8.
    No  REPAIR the circuit. TEST the system for normal operation.

  8. Y8 CHECK THE PFSM GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677A-5 GD151 (BK/GN) - Ground
    1. GFD137425Courtesy of FORD MOTOR COMPANY

    Is the resistance less than 3 ohms? 

    Yes  GO to  Y9.
    No  REPAIR the circuit. TEST the system for normal operation.

  9. Y9 CHECK THE THIRD ROW SEAT CONTROL SWITCH CIRCUITS FOR A SHORT TO VOLTAGE

    • Disconnect: Third Row Seat Control Switch C3199.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-14 CPSA1 (WH/GN) - Ground
      C3677C-4 RPSB2 (BN) - Ground
    1. GFD137423Courtesy of FORD MOTOR COMPANY

    Is any voltage present? 

    Yes  REPAIR the circuit in question. TEST the system for normal operation.
    No  GO to  Y10.

  10. Y10 CHECK THE THIRD ROW SEAT CONTROL SWITCH CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-14 CPSA1 (WH/GN) - Ground
      C3677C-4 RPSB2 (BN) - Ground
    1. GFD137423Courtesy of FORD MOTOR COMPANY

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  Y11.
    No  REPAIR the circuit in question. TEST the system for normal operation.

  11. Y11 CHECK THE THIRD ROW SEAT CONTROL SWITCH CIRCUITS FOR AN OPEN

    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-14 CPSA1 (WH/GN) C3199-5 CPSA1 (WH/GN)
      C3677C-4 RPSB2 (BN) C3199-4 RPSB2 (BN)
    1. GFD137426Courtesy of FORD MOTOR COMPANY

    Are the resistances less than 3 ohms? 

    Yes  GO to  Y12.
    No  REPAIR the circuit in question. TEST the system for normal operation.

  12. Y12 CHECK THE THIRD ROW SEAT CONTROL SWITCH

    • Connect: Third Row Seat Control Switch C3199.
    • Connect an ohmmeter between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C3677C-14 CPSA1 (WH/GN) C3677C-4 RPSB2 (BN)
    1. GFD137423Courtesy of FORD MOTOR COMPANY
    • Measure the resistance  while pressing and holding each button as indicated in the table below:
      Third Row Seat Control Switch Resistance
      All buttons at rest 7, 425-7, 575 ohms
      RH button 213-217 ohms
      LH and RH button 1, 032-1, 052 ohms
      LH button 617-630 ohms

    Are the resistances within the limits indicated? 

    Yes  INSTALL a new PFSM. REFER to Power-Fold Seat Module (PFSM) . TEST the system for normal operation.
    No  INSTALL a new third row seat control switch. REFER to Seat Control Switch - Third Row . TEST the system for normal operation.
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