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Home >> Ford >> 2020 >> Edge SE, FWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Seats >> Front Seats (2 Of 2) >> Diagnosis And Testing >> Front Seats >> Pinpoint Test(s) >> Pinpoint Test S: DTC B1151:4B >> Pinpoint Test S: DTC B1151:4B

Pinpoint Test S: DTC B1151:4B

  1. WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

  2. S1 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) FOR ON-DEMAND DIAGNOSTIC TROUBLE CODES (DTCS)

    • Start the vehicle and set the passenger seat to HIGH heat.

    • Using a diagnostic scan tool, perform the SCME self-test.

    Was DTC B1151:4B retrieved on-demand during the self-test? 

    Yes  If DTC B1152:4B is also present, GO to  S9 If DTC B1152:4B is not also present, GO to  S2
    No  GO to  S5

  3. S2 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR THERMISTOR CIRCUITS FOR A SHORT TO GROUND

    • Disconnect: Driver Side Airbag In-line C3051.

    • Disconnect: Passenger Side Airbag In-line C339.

    • Disconnect: DSM C341E.

    • Disconnect: Passenger Seat Cushion Blower Motor C3040.

    • Disconnect: Passenger Seat Backrest Blower Motor C3039.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-4
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341E-2
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  S3
    No  REPAIR the affected circuit. GO to  S22

  4. S3 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR THERMISTOR AND WIRING

    • Connect: Passenger Cushion Blower Motor C3040.

    • Connect: Passenger Seat Backrest Blower Motor C3039.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-4
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C341E-2

    • Compare the measured resistance value with the following table:
      Ambient Temperature Resistance
      0-10 deg. C (32-50 deg. F) 2, 782-1, 663 ohms
      10-20 deg. C (50-68 deg. F) 1, 837-1, 140 ohms
      20-30 deg. C (68-86 deg. F) 1, 260-806 ohms
      30-40 deg. C (86-104 deg. F) 893-570 ohms
      40-50 deg. C (104-122 deg. F) 630-428 ohms

    Is the resistance within the limits indicated? 

    Yes  GO to  S18
    No  GO to  S4

  5. S4 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR THERMISTOR

    • Disconnect: Passenger Seat Cushion Blower Motor C3040.

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-5, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-8, Component Side

    • Compare the measured resistance value with the following table:
      Ambient Temperature Resistance
      0-10 deg. C (32-50 deg. F) 2, 782-1, 663 ohms
      10-20 deg. C (50-68 deg. F) 1, 837-1, 140 ohms
      20-30 deg. C (68-86 deg. F) 1, 260-806 ohms
      30-40 deg. C (86-104 deg. F) 893-570 ohms
      40-50 deg. C (104-122 deg. F) 630-428 ohms

    Is the resistance within the limits indicated? 

    Yes  REPAIR circuit VHS27 (WH/OG) or RHS10 (BU/OG) for an open or high resistance. GO to  S22
    No  INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  6. S5 CONFIRM THE FAULT WHILE MONITORING THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) SEAT BACK TEMPERATURE - PASSENGER (SEAT_BK_TMP_P) AND SEAT CUSHION TEMPERATURE - PASSENGER (SEAT_CSH_TMP_P) PARAMETER IDENTIFICATIONS (PIDS)

    • Set the passenger seat to OFF.

    • Using a diagnostic scan tool, clear the SCME Diagnostic Trouble Codes (DTCs).

    • Using a diagnostic scan tool, monitor the SCME SEAT_BK_TMP_P and SEAT_CSH_TMP_P Parameter Identifications (PIDs).

    • NOTE: A crushed seat cushion foam pad may be the cause of the fault making it necessary to occupy the seat to recreate and identify the fault.

      Attempt to recreate the fault. Start the vehicle and set the passenger seat to HIGH heat for at least 15 minutes while occupying the seat.

    Do the Parameter Identifications (PIDs) increase incrementally (gradually) and stay within 15 deg. C (27 deg. F) of each other? 

    Yes  The fault is not present at this time. The fault may have been set due to a past concern, incorrect use of the climate controlled seat system by repeated switching between heat and cool modes or due to excessive passenger compartment temperature.
    No  If the SEAT_CSH_TMP_P PID increases incrementally and is greater than 15 deg. C (27 deg. F) difference from the SEAT_BK_TMP_P PID, GO to  S6 If the SEAT_CSH_TMP_P PID increases quickly (temperature "jumps" and does not increase incrementally) and is greater than 15 deg. C (27 deg. F) difference from the SEAT_BK_TMP_P PID, GO to  S16

  7. S6 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS

    • With the engine running, set both front seats to HIGH cool.

    • Note the airflow exhausting from the passenger seat cushion blower motor and compare it to the airflow exhausting from the driver seat cushion blower motor.

    • Carry out a wiggle test of the wire harnesses between the DSM and the passenger seat cushion blower motor while monitoring blower operation. The blower should operate consistently and not change speeds.

    Is the airflow exhausting from the passenger seat cushion blower motor comparable to the airflow exhausting from the driver seat cushion blower motor with no change in operation when carrying out the wiggle test? 

    Yes  GO to  S7
    No  If the airflow exhausting from the passenger seat cushion blower motor is not comparable to the airflow exhausting from the driver seat cushion blower motor, GO to  S8 If the passenger seat cushion blower motor operation changed while carrying out the wiggle test, IDENTIFY and REPAIR the wiring fault.

  8. S7 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS WHILE OCCUPIED

    • Note the airflow exhausting from the passenger seat cushion blower motor with the passenger seat occupied and compare it to the airflow exhausting from the driver seat cushion blower motor with the driver seat occupied.

    Is the airflow exhausting from the passenger seat cushion blower motor comparable to the airflow exhausting from the driver seat cushion blower motor? 

    Yes  GO to  S16
    No  INSTALL a new passenger seat cushion foam pad.

  9. S8 CHECK THE PASSENGER SEAT CUSHION BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

    • Ignition OFF.

    • Inspect the blower of the passenger seat cushion blower motor assembly for an obstruction or for a restricted filter.

    Is the blower obstructed or the filter restricted? 

    Yes  REMOVE the obstruction or INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor  .
    No  GO to  S9

  10. S9 CHECK THE PASSENGER SEAT CUSHION BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

    • Disconnect: Driver Side Airbag In-line C3051.

    • Disconnect: Passenger Side Airbag In-line C339.

    • Disconnect: DSM C341E.

    • Disconnect: Passenger Seat Cushion Blower Motor C3040.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-7
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C3040-7

    Is the resistance less than 3 ohms? 

    Yes  GO to  S10
    No  REPAIR the circuit. GO to  S22

  11. S10 CHECK THE PASSENGER SEAT CUSHION BLOWER CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect: DSM C341D.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-11
      GFD528764Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit. GO to  S22
    No  GO to  S11

  12. S11 CHECK THE PASSENGER SEAT CUSHION BLOWER CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-3
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  S12
    No  REPAIR the circuit. GO to  S22

  13. S12 CHECK THE PASSENGER SEAT CUSHION BLOWER CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-3
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C3040-3
      C341D-11
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C3040-4

    Are the resistances less than 3 ohms? 

    Yes  GO to  S13
    No  REPAIR the affected circuit. GO to  S22

  14. S13 CHECK THE PASSENGER SEAT CUSHION BLOWER RESISTANCE

    • NOTE: The ohmmeter must be connected with the positive lead to pin 3 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.

      Measure the component side resistance  between:

      Positive Lead Measurement / Action Negative Lead
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-3, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-4, Component Side

    Is the resistance between 4, 000 and 10, 000 ohms? 

    Yes  GO to  S14
    No  INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  15. S14 CHECK THE PASSENGER SEAT CUSHION BLOWER SPEED CONTROL RESISTANCE

    • NOTE: The ohmmeter must be connected with the positive lead to pin 4 and the negative lead to pin 7 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.

      Measure the component side resistance  between:

      Positive Lead Measurement / Action Negative Lead
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-4, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-7, Component Side

    Is the resistance between 240K and 4M ohms? 

    Yes  GO to  S15
    No  INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  16. S15 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR INSTALLATION AND FOR CRUSHED SEAT CUSHION

    • Ignition OFF.

    • Inspect the passenger seat cushion for the following:

      • Passenger seat cushion blower motor correctly installed
      • Passenger seat cushion seat cushion foam pad crushed or restricted

    Is the passenger seat cushion blower motor correctly installed and are there no signs of damage to the foam pad? 

    Yes  INSTALL the passenger seat cushion cover and seat. GO to  S18
    No  Correctly INSTALL the passenger seat cushion blower motor or INSTALL a new passenger seat cushion foam pad. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  17. S16 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR THERMISTOR AND WIRING

    • Disconnect: Driver Side Airbag In-line C3051.

    • Disconnect: Passenger Side Airbag In-line C339.

    • Disconnect: DSM C341E.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-4
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C341E-2

    • Compare the measured resistance value with the following table:
      Ambient Temperature Resistance
      0-10 deg. C (32-50 deg. F) 2, 782-1, 663 ohms
      10-20 deg. C (50-68 deg. F) 1, 837-1, 140 ohms
      20-30 deg. C (68-86 deg. F) 1, 260-806 ohms
      30-40 deg. C (86-104 deg. F) 893-570 ohms
      40-50 deg. C (104-122 deg. F) 630-428 ohms

    Is the resistance within the limits indicated? 

    Yes  GO to  S18
    No  GO to  S17

  18. S17 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR THERMISTOR

    • Disconnect: Passenger Cushion Blower Motor C3040.

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-5, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-8, Component Side

    • Compare the measured resistance value with the following table:
      Ambient Temperature Resistance
      0-10 deg. C (32-50 deg. F) 2, 782-1, 663 ohms
      10-20 deg. C (50-68 deg. F) 1, 837-1, 140 ohms
      20-30 deg. C (68-86 deg. F) 1, 260-806 ohms
      30-40 deg. C (86-104 deg. F) 893-570 ohms
      40-50 deg. C (104-122 deg. F) 630-428 ohms

    Is the resistance within the limits indicated? 

    Yes  REPAIR circuit VHS26 (VT)/ (VHS27 (WH/OG) or RHS05 (YE/VT)/ RHS10 (BU/OG) for an open or high resistance. GO to  S22
    No  INSTALL a new cushion blower motor. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  19. S18 CHECK THE PASSENGER SEAT CUSHION BLOWER MOTOR HEATING/COOLING CIRCUITRY CURRENT DRAW

    • Connect all DSM, blower motor and body harness-to-seat harness connectors.

    • NOTE: It may be necessary to open the seat wire harness conduit to allow placing the inductive current probe around the circuit as described in the following step. Care must be taken when opening up the wire harness so as not to damage any wiring or connectors. Do not damage any wiring or induce stress on any wiring or connectors. Close up the wire harness once repairs to the seat are complete.
      NOTE: Use a commercially available inductive current probe (such as Electronic Specialties Current Probe/Multimeter 685 or a Fluke I410 [used with a digital multimeter]) or the low current probe from the VMM available for use with IDS. If these are unavailable, the inductive current probe feature from a battery tester may be substituted.

      Place an inductive current probe around circuit CHS07 (GY/BU) near DSM C341D-2 and monitor the current draw.

    • Start the engine and set the passenger seat to HIGH heat.

    Is the current draw less than 11 amps? 

    Yes  GO to  S19
    No  INSTALL a new cushion blower motor. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  20. S19 CHECK RESISTANCE OF THE PASSENGER SEAT CUSHION BLOWER MOTOR AND WIRING

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-2
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C341D-10

    Is the resistance between 0.9 and 10 ohms? 

    Yes  GO to  S21
    No  GO to  S20

  21. S20 CHECK THE RESISTANCE OF THE PASSENGER SEAT CUSHION BLOWER MOTOR

    • Disconnect: Passenger Cushion Blower Motor C3040.

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-1, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529027Courtesy of FORD MOTOR COMPANY

      C3040-2, Component Side

    Is the resistance between 0.9 and 10 ohms? 

    Yes  REPAIR circuit CHS02 (YE/BU)/ CHS07 (GY/BU) or RHS02 (BU/OG)/ RHS07 (BU) for an open or high resistance. GO to  S22
    No  INSTALL a new cushion blower motor. REFER to: Front Seat Cushion Blower Motor  . GO to  S22

  22. S21 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all of the DSM 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 DSM connectors. Make sure they seat and latch correctly.

    • NOTE: Do not reconnect Driver Side Airbag In-Line C3051 or Passenger Side Airbag In-line C339 at this time.

      Reconnect all previously disconnected connectors.

    • Ignition ON.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new DSM. REFER to: Driver Front Seat Module (DSM)  . GO to  S22
    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. GO to  S22

  23. S22 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

    • Connect: Driver Side Airbag In-line C3051.

    • Connect: Passenger Side Airbag In-line C339.

    • Connect all previously disconnected connectors.

    Did the SRS prove out successfully? 

    Yes  Repair is complete. RETURN the vehicle to the customer.
    No  REFER to: Airbag Supplemental Restraint System (SRS) .
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