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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seating System - 1ST Row >> Diagnosis And Testing >> Seating >> Pinpoint Tests >> PINPOINT TEST M : The Heated Seat is Inoperative or Does Not Operate Correctly - Passenger >> PINPOINT TEST M : The Heated Seat is Inoperative or Does Not Operate Correctly - Passenger

PINPOINT TEST M : The Heated Seat is Inoperative or Does Not Operate Correctly - Passenger

  1. M1 CHECK FOR HVAC MODULE DTCs

    • Ignition ON.
    • Using a diagnostic scan tool, perform HVAC module self-test.

    Were any DTCs retrieved during the self-test? 

    Yes  For DTCs B1036:11 or B1036:13, GO to  M3. For DTCs B103A:11 or B103A:13, GO to  M4. For DTC B103A:12, GO to  M6. For all other DTCs, REFER to Climate Control DATC .
    No  GO to  M2.

  2. M2 CHECK THE TOUCHSCREEN CONTROLS OPERATION

    • Start the engine.
    • Select each audio and climate control function using the touchscreen controls.

    Do all touchscreen controls operate? 

    Yes  GO to  M12.
    No  If equipped with Premium Plus, REFER to Information and Entertainment Systems Premium Plus . If equipped with Sony Sound, Refer to article 'Information and Entertainment Systems Sony Sound', Go to Pinpoint Test L .

  3. M3 CHECK THE HEATER ELEMENT POWER CIRCUIT FOR AN OPEN OR SHORT TO GROUND

      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: Passenger Seat Side Air Bag C339 .
    • Disconnect: HVAC Module C228B .
    • Disconnect: Passenger Cushion Heater Mat C334 .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C334-1
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C334-1
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C228B-17

    Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the HVAC module? 

    Yes  GO to  M7.
    No  REPAIR the circuit. GO to  M13.

  4. M4 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND

      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: Passenger Seat Side Air Bag C339 .
    • Disconnect: HVAC Module C228B .
    • Disconnect: Passenger Cushion Heater Mat C334 .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C334-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C334-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C228B-15

    Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the HVAC module? 

    Yes  GO to  M5.
    No  REPAIR the circuit. GO to  M13.

  5. M5 CHECK THE HEATED SEAT TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND

    • Disconnect: HVAC Module C228A .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C334-3
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C334-3
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C228A-23

    Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the HVAC module? 

    Yes  GO to  M11.
    No  REPAIR the circuit. GO to  M13.

  6. M6 CHECK THE HEATED SEAT CIRCUITS FOR A SHORT TO VOLTAGE

      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: Passenger Seat Side Air Bag C339 .
    • Disconnect: Passenger Cushion Heater Mat C334 .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C334-2
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground
      C334-3
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present on any circuits? 

    Yes  REPAIR the affected circuit. GO to  M13.
    No  GO to  M12.

  7. M7 CHECK THE HEATER ELEMENT GROUND CIRCUIT FOR AN OPEN

    • Disconnect: Passenger Seat Backrest Heater Mat C335 .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C335-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  M8.
    No  REPAIR the circuit. GO to  M13.

  8. M8 CHECK CUSHION HEATED SEAT MAT FOR AN OPEN AND A SHORT TO GROUND

    • Measure the component side  resistance:
      Positive Lead Measurement / Action Negative Lead
      Passenger Seat Cushion Heater Mat C334-1, Component Side
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      Passenger Seat Cushion Heater Mat C334-1, Component Side
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Passenger Seat Cushion Heater Mat C334-4, Component Side

    Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and between 1.2 and 2.2 ohms between the passenger seat cushion heater mat pins? 

    Yes  GO to  M9.
    No  INSTALL a new seat cushion heater mat. Refer to Seat Cushion Heater Mat . GO to  M13.

  9. M9 CHECK THE BACKREST HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND

    • Measure the component side  resistance:
      Positive Lead Measurement / Action Negative Lead
      Passenger Seat Backrest Heater Mat C335-2, Component Side
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      Passenger Seat Backrest Heater Mat C335-2, Component Side
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Passenger Seat Backrest Heater Mat C335-1, Component Side

    Is the resistance greater than 10, 000 ohms between the passenger seat backrest heater mat and ground; and between 1.2 and 2.2 ohms between the passenger seat backrest heater mat pins? 

    Yes  GO to  M10.
    No  INSTALL a new backrest heater mat. Refer to Seat Backrest Heater Mat . GO to  M13.

  10. M10 CHECK FOR A SHORT TO GROUND OR OPEN CIRCUIT BETWEEN THE BACKREST AND CUSHION HEATER MAT

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C334-4
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C334-4
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C335-1

    Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the backrest heater mat? 

    Yes  GO to  M12.
    No  REPAIR the circuit. GO to  M13.

  11. M11 CHECK THE HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN OR SHORT TO GROUND

    • Measure the component side  resistance:
      Positive Lead Measurement / Action Negative Lead
      Passenger Seat Cushion Heater Mat, C334-2, Component Side
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      Passenger Seat Cushion Heater Mat, C334-2, Component Side
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Passenger Seat Cushion Heater Mat, C334-3, Component Side

    Is the resistance between 725 ohms and 170, 000 ohms between passenger seat cushion heater mat pins; and greater than 10, 000 ohms between passenger seat cushion heater mat and ground? 

    Yes  GO to  M12.
    No  INSTALL a new seat cushion heater mat. Refer to Seat Cushion Heater Mat . GO to  M13.

  12. M12 CHECK FOR CORRECT HVAC MODULE OPERATION

    • Ignition OFF.
    • Disconnect and inspect all HVAC module connectors.
    • 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
    • Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
    • Connect: Passenger Seat Cushion Heater Mat C334 (if previously disconnected).
    • Connect: Passenger Seat Backrest Heater Mat C335 (if previously disconnected).
    • Operate the system 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 HVAC module. REFER to Climate Control DATC . GO to  M13.
    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.

  13. M13 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: Passenger Seat Side Air Bag C339 .
    • Connect: Passenger Seat Cushion Heater Mat C334 (if previously disconnected).
    • Connect: Passenger Seat Backrest Heater Mat C335 (if previously disconnected).
    • 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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