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Pinpoint Test Ax : DTC B2730

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When taking measurements at Front Seat Climate Control Module (SCME) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.
NOTE: The airbag warning indicator illuminates when the correct RCM fuse is removed and the ignition is ON.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

  1. AX1 CHECK THE Front Seat Climate Control Module (SCME) FOR ON-DEMAND DTCs

    • Start the vehicle and set the driver seat to HIGH heat.
    • Enter the following diagnostic mode on the scan tool: Self Test - Front Seat Climate Control Module (SCME).

    Was DTC B2730 retrieved on-demand during the self-test? 

    Yes  GO to  AX2.
    No  GO to  AX5.

  2. AX2 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.
    • Disconnect: Driver Seat Side Airbag C3051 and Passenger Seat Side Airbag C3052.
    • Disconnect: Front Seat Climate Control Module (SCME) C3265B.
    • Disconnect: Driver Seat Backrest TED C3034.
    • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

      Connect the battery ground cable. Refer to Battery, Mounting and Cables .

    • Measure the resistance between:
      • Front Seat Climate Control Module (SCME) C3265B-9 , circuit VHS35 (VT/OG), harness side and ground.
      • Front Seat Climate Control Module (SCME) C3265B-10 , circuit RHS15 (GY/BN), harness side and ground.
    1. GFD137536Courtesy of FORD MOTOR COMPANY

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  AX3.
    No  REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  3. AX3 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR AND WIRING

    • Connect: Driver Seat Backrest TED C3034.
    • Measure the resistance between Front Seat Climate Control Module (SCME) C3265B-9 , circuit VHS35 (VT/OG), harness side and Front Seat Climate Control Module (SCME) C3265B-10 , circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following table.
      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
    1. GFD137513Courtesy of FORD MOTOR COMPANY

    Is the resistance within the limits indicated? 

    Yes  GO to  AX18.
    No  GO to  AX4.

  4. AX4 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR

    • Disconnect: Driver Seat Backrest TED C3034.
    • Measure the resistance between driver seat backrest TED C3034 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.
      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
    1. GFD137490Courtesy of FORD MOTOR COMPANY

    Is the resistance within the limits indicated? 

    Yes  REPAIR circuit VHS35 (VT/OG) or RHS15 (GY/BN) for an open or high resistance. CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .
    No  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  5. AX5 CONFIRM THE FAULT WHILE MONITORING THE Front Seat Climate Control Module (SCME) SEAT BACK THERMAL ELECTRIC DEVICE TEMPERATURE (BK_TEMP) AND SEAT CUSHION THERMAL ELECTRIC DEVICE TEMPERATURE (CSHTEMP) PIDs

    • Set the driver seat to OFF.
    • Enter the following diagnostic mode on the scan tool: Clear DTCs - Front Seat Climate Control Module (SCME).
    • Enter the following diagnostic mode on the scan tool: DataLogger - Front Seat Climate Control Module (SCME).
    • Monitor the Front Seat Climate Control Module (SCME) PIDs BK_TEMP and CSHTEMP.
    • NOTE: A crushed seat backrest foam pad or a crushed climate controlled seat manifold 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 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 driver compartment temperature. CLEAR the DTCs. REPEAT the self-test.
    No  If the BK_TEMP PID increases incrementally and is greater than 15 °C (27 °F) of the CSHTEMP PID, GO to  AX6.If the BK_TEMP PID increases quickly (temperature "jumps" and does not increase incrementally) and is greater than 15 °C (27 °F) of the CSHTEMP PID, GO to  AX16.

  6. AX6 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 TED and compare it to the airflow exhausting from the passenger seat backrest TED.
    • Carry out a wiggle test of the wire harnesses between the Front Seat Climate Control Module (SCME) and the driver seat backrest TED while monitoring blower operation of the TED. The blower should operate consistently and not change speeds

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

    Yes  GO to  AX7.
    No  If the airflow exhausting from the driver seat backrest TED is not comparable to the airflow exhausting from the passenger seat backrest TED, GO to  AX8.If the driver seat backrest TED blower operation changed while carrying out the wiggle test, IDENTIFY and REPAIR the wiring fault. CLEAR the DTCs. REPEAT the self-test.

  7. AX7 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS WHILE OCCUPIED

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

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

    Yes  GO to  AX16.
    No  INSTALL a new driver seat backrest foam pad and/or climate controlled seat manifold. CLEAR the DTCs. REPEAT the self-test.

  8. AX8 CHECK THE DRIVER SEAT BACKREST BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

    • Ignition OFF.
    • Inspect the blower of the driver seat backrest TED 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 filter. CLEAR the DTCs. REPEAT the self-test.
    No  GO to  AX9.

  9. AX9 CHECK THE DRIVER SEAT BACKREST BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

    • Disconnect: Driver Seat Side Airbag C3051 and Passenger Seat Side Airbag C3052.
    • Disconnect: Front Seat Climate Control Module (SCME) C3265C.
    • Disconnect: Driver Seat Backrest TED C3034.
    • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

      Connect the battery ground cable. Refer to Battery, Mounting and Cables .

    • Measure the resistance between Front Seat Climate Control Module (SCME) C3265C-12 , circuit CHS04 (YE/GY), harness side and driver seat backrest TED C3034-7 , circuit CHS04 (YE/GY), harness side.
    1. GFD137537Courtesy of FORD MOTOR COMPANY

    Is the resistance less than 5 ohms? 

    Yes  GO to  AX10.
    No  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  10. AX10 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.
    • Measure the voltage between Front Seat Climate Control Module (SCME) C3265C-15 , circuit CHS03 (GN/BN), harness side and ground.
    1. GFD137477Courtesy of FORD MOTOR COMPANY

    Is any voltage present? 

    Yes  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .
    No  GO to  AX11.

  11. AX11 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure the resistance between Front Seat Climate Control Module (SCME) C3265C-16 , circuit CHS13 (VT/BN), harness side and ground.
    1. GFD137440Courtesy of FORD MOTOR COMPANY

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AX12.
    No  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  12. AX12 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUITS FOR AN OPEN

    • Measure the resistance between:
      • Front Seat Climate Control Module (SCME) C3265C-16 , circuit CHS13 (VT/BN), harness side and driver seat backrest TED C3034-2 , circuit CHS13 (VT/BN), harness side.
      • Front Seat Climate Control Module (SCME) C3265C-15 , circuit CHS03 (GN/BN), harness side and driver seat backrest TED C3034-4 , circuit CHS03 (GN/BN), harness side.
    1. GFD137492Courtesy of FORD MOTOR COMPANY

    Are the resistances less than 5 ohms? 

    Yes  GO to  AX13.
    No  REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  13. AX13 CHECK THE DRIVER SEAT BACKREST BLOWER RESISTANCE

    • NOTE: The ohmmeter must be connected with the positive lead to pin 2 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 damaged.

      Measure the resistance between driver seat backrest TED C3034 pin 2 and pin 4, component side.

    1. GFD137493Courtesy of FORD MOTOR COMPANY

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

    Yes  GO to  AX14.
    No  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  14. AX14 CHECK THE DRIVER SEAT BACKREST 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 damaged.

      Measure the resistance between driver seat backrest TED C3034 pin 7 and pin 4, component side.

    1. GFD137494Courtesy of FORD MOTOR COMPANY

    Is the resistance between 240K ohms and 400K ohms? 

    Yes  GO to  AX15.
    No  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  15. AX15 CHECK THE DRIVER SEAT BACKREST TED INSTALLATION AND FOR CRUSHED SEAT BACKREST

    • Ignition OFF.
    • Inspect the driver seat backrest for the following:
      • Is the driver seat backrest TED correctly installed?
      • Is the driver seat backrest foam pad crushed or restricted?
      • Is the driver seat backrest climate controlled seat manifold crushed or restricted?

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

    Yes  INSTALL the driver seat backrest cover and seat and GO to  AX18.
    No  CORRECTLY install the driver seat backrest TED or INSTALL a new driver seat backrest foam pad and/or climate controlled seat manifold. CONNECT the battery ground cable. REFER to Battery, Mounting and Cables . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  16. AX16 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR AND WIRING

    • Ignition OFF.
    • Disconnect: Driver Seat Side Airbag C3051 and Passenger Seat Side Airbag C3052.
    • Disconnect: Front Seat Climate Control Module (SCME) C3265B.
    • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

      Connect the battery ground cable. Refer to Battery, Mounting and Cables .

    • Measure the resistance between Front Seat Climate Control Module (SCME) C3265B-9 , circuit VHS35 (VT/GN), harness side and C3265B-10 circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following table.
      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
    1. GFD137513Courtesy of FORD MOTOR COMPANY

    Is the resistance within the limits indicated? 

    Yes  GO to  AX18.
    No  GO to  AX17.

  17. AX17 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR

    • Measure the resistance between driver seat backrest TED C3034 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.
      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
    1. GFD137490Courtesy of FORD MOTOR COMPANY

    Is the resistance within the limits indicated? 

    Yes  REPAIR circuit VHS35 (VT/OG) or RHS15 (GY/BN) for an open or high resistance. CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .
    No  INSTALL a new TED. REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  18. AX18 CHECK THE DRIVER SEAT BACKREST TED HEATING/COOLING CIRCUITRY CURRENT DRAW

    • Connect: All Front Seat Climate Control Module (SCME), TED 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 Vehicle Measurement Module 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 Front Seat Climate Control Module (SCME) C3265A-J and monitor the current draw.

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

    Is the current draw less than 11 amps? 

    Yes  GO to  AX19.
    No  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  19. AX19 CHECK RESISTANCE OF THE DRIVER SEAT BACKREST TED AND WIRING

    • Ignition OFF.
    • Disconnect: Front Seat Climate Control Module (SCME) C3265A.
    • Measure the resistance between Front Seat Climate Control Module (SCME) C3265A-J circuit CHS01 (GY/VT), harness side and C3265A-K , circuit RHS01 (WH/VT), harness side.
    1. GFD137538Courtesy of FORD MOTOR COMPANY

    Is the resistance between 0.9 and 10 ohms? 

    Yes  GO to  AX21.
    No  GO to  AX20.

  20. AX20 CHECK THE RESISTANCE OF THE DRIVER SEAT BACKREST TED

    • Disconnect: Driver Seat Backrest TED C3034.
    • Measure the resistance between driver seat backrest TED C3034 pin 1 and pin 3, component side.
    1. GFD137432Courtesy of FORD MOTOR COMPANY

    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. CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .
    No  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .

  21. AX21 CHECK FOR CORRECT Front Seat Climate Control Module (SCME) OPERATION

    • Inspect the Front Seat Climate Control Module (SCME) and driver seat backrest TED harness and component side connectors and the body harness-to-seat harness connectors for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: All Front Seat Climate Control Module (SCME), TED and Body Harness-to-Seat Harness Connectors.
    • Make sure the connectors are seated correctly.
    • Start the engine.
    • Set the driver seat to OFF.
    • Enter the following diagnostic mode on the scan tool: Clear DTCs - Front Seat Climate Control Module (SCME).
    • Attempt to recreate the fault. With the engine still running set the driver seat to HIGH heat for at least 15 minutes.

    Is the concern still present? 

    Yes  INSTALL a new Front Seat Climate Control Module (SCME). REFER to Dual Climate Controlled Seat Module (DCSM) . REPEAT the self-test. TEST the system for normal operation.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.DISCONNECT the battery ground cable. CONNECT driver seat side airbag C3051 and passenger seat side airbag C3052.REPOWER the SRS. REFER to Supplemental Restraint System .
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