LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Seating System - Front) >> Diagnosis And Testing >> Front Seats >> Pinpoint Test(s) >> Pinpoint Test AJ : DTC B2729 >> Pinpoint Test AJ : DTC B2729

Pinpoint Test AJ : DTC B2729

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  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. AJ1 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 B2729 retrieved on-demand during the self-test? 

    Yes  GO to  AJ2
    No  GO to  AJ5

  3. AJ2 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR THERMISTOR CIRCUITS FOR A SHORT TO GROUND

    • Disconnect: Driver Side Airbag In-line C3051 .

    • Disconnect: Passenger Side Airbag In-line C3053 .

    • Disconnect: Driver Cushion Blower Motor C3035 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265B-7
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3265B-8
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  AJ3
    No  REPAIR the circuit in question. GO to  AJ22

  4. AJ3 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR THERMISTOR AND WIRING

    • Connect: Driver Cushion Blower Motor C3035 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265B-7
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 C3265B-8

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

    Is the resistance within the limits indicated? 

    Yes  GO to  AJ18
    No  GO to  AJ4

  5. AJ4 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR THERMISTOR

    • Disconnect: Driver Cushion Blower Motor C3035 .

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-5, Component Side
      GFD206497Courtesy of FORD MOTOR COMPANY
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-8, Component Side

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

    Is the resistance within the limits indicated? 

    Yes  REPAIR circuit VHS26 (VT) or RHS05 (YE/VT) for an open or high resistance. GO to  AJ22
    No  INSTALL a new driver seat cushion blower motor. Refer to: Front Seat Cushion Blower Motor . Go to  AJ22

  6. AJ5 CONFIRM THE FAULT WHILE MONITORING THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) SEAT BACK THERMAL ELECTRIC DEVICE TEMPERATURE (BKTMP) AND SEAT CUSHION THERMAL ELECTRIC DEVICE TEMPERATURE (CSHTEMP) PARAMETER IDENTIFICATIONS (PIDS)

    • Set the driver seat to OFF.

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

    • Using a diagnostic scan tool, monitor the SCME BKTMP and CSHTEMP.

    • 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 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 ° C (27 ° F) of each other? 

    Yes  Fault not present at this time. Fault may have been set due to a past failure, 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 CSHTEMP PID increases incrementally and is greater than 15 ° C (27 ° F) of the BKTMP PID, GO to  AJ6. If the CSHTEMP PID increases quickly (temperature "jumps" and does not increase incrementally) and is greater than 15 ° C (27 ° F) of the BKTMP PID, GO to  AJ16

  7. AJ6 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 cushion blower motor and compare it to the airflow exhausting from the driver seat cushion blower motor.

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

    Is the airflow exhausting from the driver 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  AJ7
    No  If the airflow exhausting from the driver seat cushion blower motor is not comparable to the airflow exhausting from the passenger seat cushion blower motor, GO to  AJ8
    If the driver seat cushion blower motor blower operation changed while carrying out the wiggle test, IDENTIFY and REPAIR the wiring fault.

  8. AJ7 COMPARE OPERATION OF THE DRIVER AND DRIVER SEATS WHILE OCCUPIED

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

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

    Yes  GO to  AJ16
    No  INSTALL a new driver seat cushion foam pad.

  9. AJ8 CHECK THE DRIVER SEAT CUSHION BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

    • Ignition OFF.

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

    Is the blower motor obstructed or the filter restricted? 

    Yes  REMOVE the obstruction or INSTALL a new seat cushion blower motor. Refer to: Front Seat Cushion Blower Motor .
    No  GO to  AJ9

  10. AJ9 CHECK THE DRIVER SEAT CUSHION BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

    • Disconnect: Driver Side Airbag In-line C3051 .

    • Disconnect: Passenger Side Airbag In-line C3053 .

    • Disconnect: Driver Cushion Blower Motor C3035 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265C-11
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 C3035-7

    Is the resistance less than 3 ohms? 

    Yes  GO to  AJ10
    No  REPAIR the circuit. GO to  AJ22

  11. AJ10 CHECK THE DRIVER SEAT CUSHION BLOWER CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265C-15
      GFD200696Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit. GO to  AJ22
    No  GO to  AJ11

  12. AJ11 CHECK THE DRIVER SEAT CUSHION BLOWER CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265C-16
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AJ12
    No  REPAIR the circuit. GO to  AJ22

  13. AJ12 CHECK THE DRIVER SEAT CUSHION BLOWER CIRCUITS FOR AN OPEN

    Are the resistances less than 3 ohms? 

    Yes  GO to  AJ13
    No  REPAIR the circuit in question. GO to  AJ22

  14. AJ13 CHECK THE DRIVER 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
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-3, Component Side
      GFD206497Courtesy of FORD MOTOR COMPANY
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-4, Component Side

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

    Yes  GO to  AJ14
    No  INSTALL a new driver seat cushion blower motor. Refer to: Front Seat Cushion Blower Motor . Go to  AJ22

  15. AJ14 CHECK THE DRIVER SEAT CUSHION BLOWER SPEED CONTROL RESISTANCE

    • NOTE: The ohmmeter must be connected with the positive lead to pin 7 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
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-7, Component Side
      GFD206497Courtesy of FORD MOTOR COMPANY
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-4, Component Side

    Is the resistance between 240K and 400K ohms? 

    Yes  GO to  AJ15
    No  INSTALL a new driver seat cushion blower motor. Refer to: Front Seat Cushion Blower Motor . Go to  AJ22

  16. AJ15 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR INSTALLATION AND FOR CRUSHED SEAT CUSHION

    • Ignition OFF.

    • Inspect the driver seat cushion for the following:

      • Blower motor correctly installed
      • Seat cushion foam pad crushed or restricted

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

    Yes  INSTALL the driver seat cushion cover and seat. GO to  AJ18
    No  CORRECTLY install the driver seat cushion blower motor or INSTALL a new driver seat cushion foam pad. GO to  AJ22

  17. AJ16 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR THERMISTOR AND WIRING

    • Disconnect: Driver Side Airbag In-line C3051 .

    • Disconnect: Passenger Side Airbag In-line C3053 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265B-7
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 C3265B-8

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

    Is the resistance within the limits indicated? 

    Yes  GO to  AJ18
    No  GO to  AJ17

  18. AJ17 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR THERMISTOR

    • Disconnect: Driver Cushion Blower Motor C3035 .

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-5, Component Side
      GFD206497Courtesy of FORD MOTOR COMPANY
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-8, Component Side

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

    Is the resistance within the limits indicated? 

    Yes  REPAIR circuit VHS26 (VT) or RHS05 (YE/VT) for an open or high resistance. GO to  AJ22
    No  INSTALL a new cushion blower motor. Refer to: Front Seat Cushion Blower Motor . Go to  AJ22

  19. AJ18 CHECK THE DRIVER SEAT CUSHION BLOWER MOTOR HEATING/COOLING CIRCUITRY CURRENT DRAW

    • Connect all SCME, blower motor and Body Harness-to-Seat Harness Connectors.

    • NOTE: It may be necessary to open the seat wiring 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 wiring 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 wiring 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 CHS02 (YE/BU) near SCME C3265A-G 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  AJ19
    No  INSTALL a new cushion blower motor. Refer to: Front Seat Cushion Blower Motor . Go to  AJ22

  20. AJ19 CHECK RESISTANCE OF THE DRIVER SEAT CUSHION BLOWER MOTOR AND WIRING

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265A-G
      GFD206497Courtesy of FORD MOTOR COMPANY
      		 C3265A-H

    Are the resistances between 0.9 and 10 ohms? 

    Yes  GO to  AJ21
    No  GO to  AJ20

  21. AJ20 CHECK THE RESISTANCE OF THE DRIVER SEAT CUSHION BLOWER MOTOR

    • Disconnect: Driver Cushion Blower Motor C3035 .

    • Measure the component side resistance  between:
      Positive Lead Measurement / Action Negative Lead
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-1, Component Side
      GFD206497Courtesy of FORD MOTOR COMPANY
      GFD208202Courtesy of FORD MOTOR COMPANY

      C3035-2, Component Side

    Is the resistance between 0.9 and 10 ohms? 

    Yes  REPAIR circuit CHS02 (YE/BU) or RHS02 (BU/OG) for an open or high resistance. GO to  AJ22
    No  INSTALL a new cushion blower motor. Refer to: Front Seat Cushion Blower Motor . Go to  AJ22

  22. AJ21 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) OPERATION

    • Ignition OFF.

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

    • NOTE: Do not reconnect Driver Side Airbag In-line C3051 or Passenger Side Airbag In-line C3053 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new SCME. Refer to: Front Seat Climate Control Module [SCME] . Go to  AJ22
    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  AJ22

  23. AJ22 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

    • Connect: Driver Side Airbag In-line C3051 .

    • Connect: Passenger Side Airbag In-line C3053 .

    • 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) .
scientia non olet · About LEMON Manuals