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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Seating System - 1ST Row >> Diagnosis And Testing >> Seating >> Pinpoint Tests >> PINPOINT TEST C : The Power Lumbar is Inoperative - Driver >> PINPOINT TEST C : The Power Lumbar is Inoperative - Driver

PINPOINT TEST C : The Power Lumbar is Inoperative - Driver

  1. C1 CHECK FOR VOLTAGE TO THE POWER LUMBAR MOTOR

      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

    • Ignition OFF.

    • Disconnect: Driver Seat Side Air Bag C3051 .
    • Disconnect: Power Lumbar Motor C3215 .
      NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
    • While operating the seat control switch in both directions, measure:
      Positive Lead Measurement / Action Negative Lead
      C3215-A
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 C3215-B

    Is the voltage greater than 11 volts when the seat control switch is operated and 0 volt in the rest position? 

    Yes  INSTALL a new power lumbar assembly. Refer to Lumbar Assembly - Power . GO to  C4.
    No  GO to  C2.

  2. C2 CHECK THE POWER LUMBAR MOTOR CIRCUITS FOR A SHORT TO GROUND

    • Disconnect: Driver Seat Control Switch C369 .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C369-10
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C369-7
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  C3.
    No  REPAIR the affected circuit. GO to  C4.

  3. C3 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C369-10
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C3215-B
      C369-7
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C3215-A

    Are the resistances less than 3 ohms? 

    Yes  INSTALL a new seat control switch. Refer to Seat Control Switch . GO to  C4.
    No  REPAIR the affected circuit. GO to  C4.

  4. C4 CHECK FOR SRS DTCs

      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

    • Ignition OFF.

    • Connect: Driver Seat Side Air Bag C3051 .
    • Connect: All previously disconnected electrical connectors.
    • Ignition ON.
    • Using a diagnostic scan tool, clear the RCM DTCs.
    • Cycle the ignition OFF then ON.
    • Using a diagnostic scan tool, perform RCM self-test.

    Are any RCM DTCs retrieved during self-test? 

    Yes  REFER to Supplemental Restraint System for pinpoint test direction.
    No  The repair is complete. RETURN the vehicle to the customer.
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