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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seat System - Seats >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test J: The Power Lumbar is Inoperative - Passenger >> Pinpoint Test J: The Power Lumbar Is Inoperative - Passenger

Pinpoint Test J: The Power Lumbar Is Inoperative - Passenger

NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. J1 CHECK THE POWER LUMBAR FOR CORRECT OPERATION 
    • Operate the power lumbar from the seat control switch.
    • Does the power lumbar operate in either position? 
    • Yes  : If only up/down motor operates, GO to  J4.

      If only in/out motor operates, GO to  J7.

    • No  : GO to J2.
  2. J2 CHECK THE SEAT CONTROL SWITCH CIRCUIT FOR VOLTAGE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article.
    • Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
    • Disconnect: Passenger Seat Side Air Bag C3133.
    • Disconnect: Passenger Seat Control Switch C3190a.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, BATTERY MOUNTING & BATTERY CABLES article.
    • Measure the voltage between driver seat control switch C3190a-12, circuit CBX05 (VT/RD), harness side and ground.
      Fig 1: Measuring Voltage Between Driver Seat Control Switch C3190a-12, Circuit CBX05 (VT/RD), Harness Side And Ground
      G07819546Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to J3.
    • No  : VERIFY Battery Junction Box (BJB) fuse 5 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

      If SJB fuse is not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify possible causes of the circuit short. DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  3. J3 CHECK SEAT CONTROL SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between passenger seat control switch C3190a-7, circuit GD903 (BK/WH), harness side and ground.
      Fig 2: Measuring Resistance Between Passenger Seat Control Switch C3190a-7, Circuit GD903 (BK/WH), Harness Side And Ground
      G07819547Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH  . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    • No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  4. J4 CHECK THE IN/OUT LUMBAR MOTOR 
    NOTE: The inboard motor is the in/out lumbar motor.
    • Ignition OFF.
    • Depower the SRS. Refer to the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
    • Disconnect: Passenger Seat Side Air Bag C3133.
    • Disconnect: Lumbar Motor C3216.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, BATTERY MOUNTING & BATTERY CABLES article.
    • While toggling the in/out power lumbar switch, measure the voltage between in/out lumbar motor C3216-B, circuit CPS18 (BN/GN), harness side and in/out lumbar motor C3216-A, circuit CPS19 (GY/VT), harness side.
      Fig 3: Measuring Voltage Between In/Out Lumbar Motor C3216-B, Circuit CPS18 (BN/GN) And In/Out Lumbar Motor C3216-A, Circuit CPS19 (GY/VT)
      G07819548Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts when the in/out power lumbar switch is operated in both directions and 0 volt in the rest position? 
    • Yes  : INSTALL a new lumbar assembly. REFER to LUMBAR ASSEMBLY  . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    • No  : GO to J5.
  5. J5 CHECK THE IN/OUT MOTOR CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: Passenger Seat Control Switch C3190b.
    • Measure the resistance between:
      • seat control switch C3190b-1, circuit CPS20 (VT), harness side and ground.
      • seat control switch C3190b-5, circuit CPS21 (WH/OG), harness side and ground.
        Fig 4: Measuring Resistance Between Seat Control Switch C3190b-5, Circuit CPS21 (WH/OG), Harness Side And Ground
        G07819549Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to J6.
    • No  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  6. J6 CHECK THE IN/OUT LUMBAR MOTOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      • seat control switch C3190b-1, circuit CPS20 (VT), harness side and power lumbar motor C3216-B, circuit CPS18 (BN/GN), harness side.
      • seat control switch C3190b-5, circuit CPS21 (WH/OG), harness side and power lumbar motor C3216-A, circuit CPS19 (GY/VT), harness side.
        Fig 5: Measuring Resistance Between Seat Control Switch C3190b-5, Circuit CPS21 (WH/OG) And Power Lumbar Motor C3216-A, Circuit CPS19 (GY/VT)
        G07819550Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH  . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    • No  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  7. J7 CHECK THE UP/DOWN LUMBAR MOTOR 
    NOTE: The outboard motor is the up/down lumbar motor.
    • Ignition OFF.
    • Depower the SRS. Refer to the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
    • Disconnect: Passenger Seat Side Air Bag C3133.
    • Disconnect: Lumbar Motor C336.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, BATTERY MOUNTING & BATTERY CABLES article.
    • While toggling the up/down power lumbar switch, measure the voltage between up/down lumbar motor C336-B, circuit CPS64 (BN/VT), harness side and up/down lumbar motor C336-A, circuit CPS65 (WH/GN), harness side.
      Fig 6: Measuring Voltage Between Up/Down Lumbar Motor C336-B, Circuit CPS64 (BN/VT) And Up/Down Lumbar Motor C336-A, Circuit CPS65 (WH/GN)
      G07819551Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts when the up/down power lumbar switch is operated in both directions and 0 volt in the rest position? 
    • Yes  : INSTALL a new lumbar assembly. REFER to LUMBAR ASSEMBLY  . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    • No  : GO to J8.
  8. J8 CHECK THE UP/DOWN LUMBAR MOTOR CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: Passenger Seat Control Switch C3190b.
    • Measure the resistance between:
      • seat control switch C3190b-4, circuit CPS89 (BU/BN), harness side and ground.
      • seat control switch C3190b-8, circuit CPS88 (GY/OG), harness side and ground.
        Fig 7: Measuring Resistance Between Seat Control Switch C3190b-8, Circuit CPS88 (GY/OG), Harness Side And Ground
        G07819552Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to J9.
    • No  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  9. J9 CHECK THE UP/DOWN LUMBAR MOTOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      • seat control switch C3190b-4, circuit CPS89 (BU/BN), harness side and power lumbar motor C336-A, circuit CPS65 (WH/GN), harness side.
      • seat control switch C3190b-8, circuit CPS88 (GY/OG), harness side and power lumbar motor C336-B, circuit CPS64 (BN/VT), harness side.
        Fig 8: Measuring Resistance Between Seat Control Switch C3190b-8, Circuit CPS88 (GY/OG) And Power Lumbar Motor C336-B, Circuit CPS64 (BN/VT)
        G07819553Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH  . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    • No  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3066.

      CONNECT passenger seat side air bag module C3133. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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