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Pinpoint Test Av: DTC B2730

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) 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 air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. AV1 CHECK THE DCSM 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 - DCSM  .

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

    • Yes  : GO to AV2  .
    • No  : GO to  AV5.
  2. AV2 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag C328 and Passenger Seat Side Air Bag C327.
    • Disconnect: DCSM  C3036B.
    • Disconnect: Driver Seat Backrest TED  C3322.
    • 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:
      • DCSM C3036B-9  , circuit VHS35 (VT/OG), harness side and ground.
      • DCSM C3036B-10  , circuit RHS15 (GY/BN), harness side and ground.
        Fig 1: Measuring Resistance Between DCSM (C3036B-9), Circuit VHS35 (VT/OG), Harness Side And Ground
        G06134527Courtesy of FORD MOTOR CO.

    Are the resistances greater than 10, 000 ohms? 

    • Yes  : GO to AV3  .
    • No  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. AV3 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR AND WIRING 
    • Connect: Driver Seat Backrest TED  C3322.
    • Measure the resistance between DCSM C3036B-9  , circuit VHS35 (VT/OG), harness side and DCSM C3036B-10  , circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following chart.
      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
      • Fig 2: Measuring Resistance Between DCSM (C3036B-9), Circuit VHS35 (VT/OG) And DCSM (C3036B-10), Circuit RHS15 (GY/BN)
      G06076993Courtesy of FORD MOTOR CO.

    Is the resistance within the limits indicated? 

    • Yes  : GO to  AV18.
    • No  : GO to AV4  .
  4. AV4 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR 
    • Disconnect: Driver Seat Backrest TED  C3322.
    • Measure the resistance between driver seat backrest TED  C3322 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following chart.
      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
      • Fig 3: Measuring Resistance Between Driver Seat Backrest TED (C3322) Pin 5 And Pin 8
      G06076995Courtesy of FORD MOTOR CO.

    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 air bag module C328 and passenger seat side air bag module C327.

      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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. AV5 CONFIRM THE FAULT WHILE MONITORING THE DCSM 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 - DCSM  .
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM  .
    • Monitor the DCSM  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 AV6  .

      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  AV16.

  6. AV6 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 DCSM  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 AV7  .
    • 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  AV8.

      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. AV7 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS WHILE OCCUPIED 
    • Note the airflow exhausting from the driver 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  AV16.
    • No  : INSTALL a new driver seat backrest foam pad and/or climate controlled seat manifold. CLEAR the DTCs. REPEAT the self-test.
  8. AV8 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 AV9  .
  9. AV9 CHECK THE DRIVER SEAT BACKREST BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN 
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag C328 and Passenger Seat Side Air Bag C327.
    • Disconnect: DCSM  C3036C.
    • Disconnect: Driver Seat Backrest TED  C3322.
    • 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 DCSM C3036C-12  , circuit VHS16 (BU/GN), harness side and driver seat backrest TED C3322-7  , circuit VHS16 (BU/GN), harness side.
      Fig 4: Measuring Resistance Between DCSM (C3036C-12), Circuit VHS16 (BU/GN) And Driver Seat Backrest TED (C3322-7), Circuit VHS16 (BU/GN)
      G06134529Courtesy of FORD MOTOR CO.

    Is the resistance less than 5 ohms? 

    • Yes  : GO to AV10  .
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  10. AV10 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between DCSM C3036C-15  , circuit RHS03 (GY/OG), harness side and ground.
      Fig 5: Measuring Voltage Between DCSM (C3036C-15), Circuit RHS03 (GY/OG), Harness Side And Ground
      G06077035Courtesy of FORD MOTOR CO.

    Is any voltage present? 

    • Yes  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    • No  : GO to AV11  .
  11. AV11 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM C3036C-16  , circuit CHS03 (GN/BN), harness side and ground.
      Fig 6: Measuring Resistance Between DCSM (C3036C-16), Circuit CHS03 (GN/BN), Harness Side And Ground
      G06077036Courtesy of FORD MOTOR CO.

    Is the resistance greater than 10, 000 ohms? 

    • Yes  : GO to AV12  .
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  12. AV12 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      • DCSM C3036C-16  , circuit CHS03 (GN/BN), harness side and driver seat backrest TED C3322-2  , circuit CHS03 (GN/BN), harness side.
      • DCSM C3036C-15  , circuit RHS03 (GY/OG), harness side and driver seat backrest TED C3322-4  , circuit RHS03 (GY/OG), harness side.
        Fig 7: Measuring Resistance Between DCSM (C3036C-16), Circuit CHS03 (GN/BN) And Driver Seat Backrest TED (C3322-2), Circuit CHS03 (GN/BN)
        G06173469Courtesy of FORD MOTOR CO.

    Are the resistances less than 5 ohms? 

    • Yes  : GO to AV13  .
    • No  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  13. AV13 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  C3322 pin 2 and pin 4, component side.

      Fig 8: Measuring Resistance Between Driver Seat Backrest TED (C3322) Pin 2 And Pin 4
      G06077017Courtesy of FORD MOTOR CO.

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

    • Yes  : GO to AV14  .
    • 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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  14. AV14 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  C3322 pin 7 and pin 4, component side.

      Fig 9: Measuring Resistance Between Driver Seat Backrest TED (C3322) Pin 7 And Pin 4
      G06076991Courtesy of FORD MOTOR CO.

    Is the resistance between 240K ohms and 420K ohms? 

    • Yes  : GO to AV15  .
    • 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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  15. AV15 CHECK THE DRIVER SEAT BACKREST TED INSTALLATION AND FOR CRUSHED SEAT BACKREST 

    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  AV18.
    • 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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  16. AV16 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR AND WIRING 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag C328 and Passenger Seat Side Air Bag C327.
    • Disconnect: DCSM  C3036B.
    • 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 DCSM C3036B-9  , circuit VHS35 (VT/OG), harness side and C3036B-10  circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following chart.
      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
      • Fig 10: Measuring Resistance Between DCSM (C3036B-9), Circuit VHS35 (VT/OG) And (C3036B-10), Circuit RHS15 (GY/BN)
      G06134489Courtesy of FORD MOTOR CO.

    Is the resistance within the limits indicated? 

    • Yes  : GO to  AV18.
    • No  : GO to AV17  .
  17. AV17 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR 
    • Measure the resistance between driver seat backrest TED  C3322 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following chart.
      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
      • Fig 11: Measuring Resistance Between Driver Seat Backrest TED (C3322) Pin 5 And Pin 8
      G06076995Courtesy of FORD MOTOR CO.

    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 air bag module C328 and passenger seat side air bag module C327.

      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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  18. AV18 CHECK THE DRIVER SEAT BACKREST TED HEATING/COOLING CIRCUITRY CURRENT DRAW 
    • Connect: All DCSM  , 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 Integrated Diagnostic System (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 DCSM 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 AV19  .
    • 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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  19. AV19 CHECK RESISTANCE OF THE DRIVER SEAT BACKREST TED AND WIRING 
    • Ignition OFF.
    • Disconnect: DCSM  C3036A.
    • Measure the resistance between DCSM C3036A-J  circuit CHS01 (GY/VT), harness side and C3036A-K  , circuit RHS01 (WH/VT), harness side.
      Fig 12: Measuring Resistance Between DCSM (C3036A-J), Circuit CHS01 (GY/VT) And (C3036A-K), Circuit RHS01 (WH/VT)
      G07934666Courtesy of FORD MOTOR CO.

    Is the resistance between 0.9 and 10 ohms? 

    • Yes  : GO to  AV21.
    • No  : GO to AV20  .
  20. AV20 CHECK THE RESISTANCE OF THE DRIVER SEAT BACKREST TED 
    • Disconnect: Driver Seat Backrest TED  C3322.
    • Measure the resistance between driver seat backrest TED  C3322 pin 1 and pin 3, component side.
      Fig 13: Measuring Resistance Between Driver Seat Backrest TED (C3322) Pin 1 And Pin 3
      G06076908Courtesy of FORD MOTOR CO.

    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 air bag module C328 and passenger seat side air bag module C327.

      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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  21. AV21 CHECK FOR CORRECT DCSM OPERATION 
    • Inspect the DCSM  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 DCSM  , 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 - DCSM  .
    • 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 DCSM  . 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 air bag module C328 and passenger seat side air bag module C327.

      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 air bag module C328 and passenger seat side air bag module C327.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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