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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 R: DTC B1154:4B >> Pinpoint Test R: DTC B1154:4B

Pinpoint Test R: DTC B1154:4B

  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. R1 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) FOR ON-DEMAND DIAGNOSTIC TROUBLE CODES (DTCS)

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

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

    Was DTC B1154:4B retrieved on-demand during the self-test? 

    Yes  If DTC B1153:4B is also present, GO to  R9 If DTC B1153:4B is not also present, GO to  R2
    No  GO to  R5

  3. R2 CHECK THE DRIVER SEAT BACKREST BLOWER MOTOR THERMISTOR CIRCUITS FOR A SHORT TO GROUND

    • Disconnect: Driver Side Airbag In-line C3051.

    • Disconnect: DSM C341E.

    • Disconnect: Driver Backrest Blower Motor C3034.

    • Disconnect: Driver Cushion Blower Motor C3035.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-5
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 Ground
      C341E-1
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  R3
    No  REPAIR the affected circuit. GO to  R22

  4. R3 CHECK THE DRIVER SEAT BACKREST BLOWER MOTOR THERMISTOR AND WIRING

    • Connect: Driver Backrest Blower Motor C3034.

    • Connect: Driver Cushion Blower Motor C3035.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-5
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C341E-1

    • 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  R18
    No  GO to  R4

  5. R4 CHECK THE DRIVER SEAT BACKREST BLOWER MOTOR THERMISTOR

    • Disconnect: Driver Backrest Blower Motor C3034.

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-5, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-8, 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 CHS14 (GN) or CHS29 (WH/BU)/ RHS05 (YE/VT) for an open or high resistance. GO to  R22
    No  INSTALL a new driver seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  . GO to  R22

  6. R5 CONFIRM THE FAULT WHILE MONITORING THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) SEAT BACK TEMPERATURE - DRIVER (SEAT_BK_TMP_D) AND SEAT CUSHION TEMPERATURE - DRIVER (SEAT_CSH_TMP_D) 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_D and SEAT_CSH_TMP_D.

    • NOTE: A crushed seat backrest 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 driver 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_BK_TMP_D PID increases incrementally and is greater than 15 deg. C (27 deg. F) difference from the SEAT_CSH_TMP_D PID, GO to  R6 If the SEAT_BK_TMP_D PID increases quickly (temperature "jumps" and does not increase incrementally) and is greater than 15 deg. C (27 deg. F) from the SEAT_CSH_TMP_D PID, GO to  R16

  7. R6 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 driver seat backrest blower motor and compare it to the airflow exhausting from the passenger seat backrest blower motor.

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

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

    Yes  GO to  R7
    No  If the airflow exhausting from the driver seat backrest blower motor is not comparable to the airflow exhausting from the passenger seat backrest blower motor, GO to  R8 If the driver seat backrest blower motor operation changed while carrying out the wiggle test, IDENTIFY and REPAIR the wiring fault.

  8. R7 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS WHILE OCCUPIED

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

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

    Yes  GO to  R16
    No  INSTALL a new driver seat backrest foam pad.

  9. R8 CHECK THE DRIVER SEAT BACKREST BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

    • Ignition OFF.

    • Inspect the blower of the driver seat backrest 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 seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  .
    No  GO to  R9

  10. R9 CHECK THE DRIVER SEAT BACKREST BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

    • Disconnect: Driver Side Airbag In-line C3051.

    • Disconnect: DSM C341E.

    • Disconnect: Driver Backrest Blower Motor C3034.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-10
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C3034-7

    Is the resistance less than 3 ohms? 

    Yes  GO to  R10
    No  REPAIR the circuit. GO to  R22

  11. R10 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect: DSM C341D.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-9
      GFD528764Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit. GO to  R22
    No  GO to  R11

  12. R11 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

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

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  R12
    No  REPAIR the circuit. GO to  R22

  13. R12 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-4
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C3034-3
      C341D-9
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C3034-4

    Are the resistances less than 3 ohms? 

    Yes  GO to  R13
    No  REPAIR the affected circuit. GO to  R22

  14. R13 CHECK THE DRIVER SEAT BACKREST 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
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-3, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-4, Component Side

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

    Yes  GO to  R14
    No  INSTALL a new driver seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  . GO to  R22

  15. R14 CHECK THE DRIVER SEAT BACKREST 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
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-4, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-7, Component Side

    Is the resistance between 240K and 4M ohms? 

    Yes  GO to  R15
    No  INSTALL a new driver seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  . GO to  R22

  16. R15 CHECK THE DRIVER SEAT BACKREST BLOWER MOTOR INSTALLATION AND FOR CRUSHED SEAT BACKREST

    • Ignition OFF.

    • Inspect the driver seat backrest for the following:

      • Blower motor correctly installed
      • Backrest foam pad crushed or restricted

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

    Yes  INSTALL the driver seat backrest cover and seat. GO to  R18
    No  Correctly INSTALL the driver seat backrest blower motor or INSTALL a new driver seat backrest foam pad. GO to  R22

  17. R16 CHECK THE DRIVER SEAT BACKREST BLOWER MOTOR THERMISTOR AND WIRING

    • Disconnect: Driver Side Airbag In-line C3051.

    • Disconnect: DSM C341E.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341E-5
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C341E-1

    • 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  R18
    No  GO to  R17

  18. R17 CHECK THE DRIVER SEAT BACKREST BLOWER MOTOR THERMISTOR

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-5, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-8, 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 CHS14 (GN) or CHS29 (WH/BU)/ RHS05 (YE/VT) for an open or high resistance. GO to  R22
    No  INSTALL a new driver seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  . GO to  R22

  19. R18 CHECK THE DRIVER SEAT BACKREST 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 CHS01 (GY/VT) near DSM C341D-5 and monitor the current draw.

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

    Is the current draw less than 11 amps? 

    Yes  GO to  R19
    No  INSTALL a new driver seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  . GO to  R22

  20. R19 CHECK RESISTANCE OF THE DRIVER SEAT BACKREST BLOWER MOTOR AND WIRING

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C341D-5
      GFD528762Courtesy of FORD MOTOR COMPANY
      		 C341D-15

    Are the resistances between 0.9 and 10 ohms? 

    Yes  GO to  R21
    No  GO to  R20

  21. R20 CHECK THE RESISTANCE OF THE DRIVER SEAT BACKREST BLOWER MOTOR

    • Disconnect: Driver Backrest Blower Motor C3034.

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-1, Component Side
      GFD528762Courtesy of FORD MOTOR COMPANY
      GFD529028Courtesy of FORD MOTOR COMPANY

      C3034-2, Component Side

    Is the resistance between 0.9 and 10 ohms? 

    Yes  REPAIR circuit CHS01 (GY/VT) or RHS01 (WH/VT) for an open or high resistance. GO to  R22
    No  INSTALL a new driver seat backrest blower motor. REFER to: Front Seat Backrest Blower Motor  . GO to  R22

  22. R21 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 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  R22
    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  R22

  23. R22 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

    • Connect: Driver Side Airbag In-line C3051.

    • 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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