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Pinpoint Test AP: DTC B272D

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. 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: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. AP1 CHECK THE DCSM FOR DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
    • Was DTC B272A or B272B retrieved? 
    1. Yes  : For DTC B272A, GO to PINPOINT TEST AM . For DTC B272B, GO to PINPOINT TEST AN .
    2. No  : GO to AP2  .
  2. AP2 MONITOR THE TED TEMPERATURE PIDs 
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM - PIDs.
      • Passenger cushion thermal electric device (TED) temperature (PCSHTMP)
      • Passenger back TED temperature (PBKTMP)
      • Seat cushion thermal electric device temperature (CSHTEMP)
      • Seat back thermal electric device temperature (BK_TEMP)
      • NOTE: Make sure the temperature of the climate controlled seats has stabilized before monitoring the PIDs. Not allowing stabilization can cause incorrect readings and lead to incorrect identification of components that are not faulty.
    • Monitor the TED temperature PIDs with the climate controlled seats OFF. Compare the PIDs of the front passenger seat to those of the driver seat, this can help identify if there is a concern with the front passenger seat cushion or backrest PID readings.
    • Are both front passenger seat TED temperature PIDs within 10°C (18°F) of the ambient temperature? 
    1. Yes  : GO to AP3  .
    2. No  : If the front passenger seat cushion PID varies 10°C (18°F) or more from ambient temperature, GO to  AP16. If the front passenger seat backrest PID varies 10°C (18°F) or more from ambient temperature, GO to  AP32.
  3. AP3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR BACKREST TED 
    • Ignition OFF.
    • Ignition ON.
      • NOTE: A crushed seat cushion foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
      NOTE: If the seat shuts down before a 15-minute heat cycle has timed-out, carry out the DCSM self-test and go to the DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM) DTC TABLE  to continue diagnostics.
    • After cycling the ignition and with the engine running, set the driver seat to high heat (3 indicators illuminated on HVAC module). Allow the seat to heat for at least 15 minutes while monitoring the TED temperature PIDs of the driver seat. If necessary, when the seat times-out after 15 minutes, set the driver seat to high heat once again.
    • Do the driver seat cushion TED and backrest TED PIDs vary more than 60°C (108°F) from each other? 
    1. Yes  : If the front passenger seat cushion PID is 60°C (108°F) hotter than the backrest PID, GO to  AP5.

      If the front passenger seat backrest PID is 60°C (108°F) hotter than the cushion PID, GO to  AP20.

    2. No  : GO to AP4  .
  4. AP4 CHECK THE TEDs COOLING PERFORMANCE 
    1. Yes  : The DTC may have been set by extreme cabin temperatures or excessive sunload on the seat causing the system to enter recovery mode. Occupant size and weight characteristics can also be a factor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If a concern cannot be found or duplicated, RETURN the vehicle to the customer.
    2. No  : CHECK the affected seat cushion or backrest for correct installation of the climate controlled seat components (TED, manifold, plenum, air ducts and foam pad). CHECK for airflow restrictions (TED inlets and outlets, TED-to-manifold or plenum connections, filters and ducts) and REPAIR as needed. CHECK for an intermittent wiring fault. REPAIR as needed. REPEAT the self-test. CLEAR the DTCs.
  5. AP5 CHECK FOR CORRECT TED INSTALLATION AND FOR CRUSHED FOAM 
    • Ignition OFF.
    • Remove the seat. Refer to SEAT - FRONT  in this service information.
    • Remove the seat cushion trim cover. Refer to SEAT CUSHION COVER - FRONT  in this service information.
    • Inspect the seat cushion for the following:
      • Is the cushion blower obstructed?
      • Is the blower filter restricted or plugged?
      • Is the TED correctly installed?
      • Is the seat cushion foam pad crushed or restricted?
      • Is the climate controlled seat manifold crushed or restricted?
    • Is the TED correctly installed and the foam pad and manifold OK? 
    1. Yes  : GO to AP6  .
    2. No  : Correctly INSTALL the cushion TED or INSTALL a new seat cushion foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
  6. AP6 CHECK THE BACKREST TED GROUND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM C3305A.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module 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 & CABLES -- FUSION, MILAN & MKZ article.
    • Ignition ON.
    • Measure the voltage between DCSM C3305A-D, circuit RHS06 (WH), harness side and ground.
      Fig 1: Measuring Voltage Between DCSM C3305A-D, Circuit RHS06 (WH), Harness Side And Ground
      G07788893Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP7  .
  7. AP7 CHECK THE BACKREST TED FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM C3305A-C, circuit CHS06 (BU/BN), harness side and ground.
      Fig 2: Measuring Resistance Between DCSM C3305A-C, Circuit CHS06 (BU/BN), Harness Side And Ground
      G07788894Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to AP8  .
    2. No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  8. AP8 CHECK THE RESISTANCE OF THE BACKREST TED AND WIRING 
    • Measure the resistance between DCSM C3305A-C, circuit CHS06 (BU/BN), harness side and DCSM C3305A-D, circuit RHS06 (WH), harness side.
      Fig 3: Measuring Resistance Between DCSM C3305A-C, Circuit CHS06 (BU/BN) And DCSM C3305A-D, Circuit RHS06 (WH)
      G07788895Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
    1. Yes  : GO to  AP10.
    2. No  : GO to AP9  .
  9. AP9 CHECK THE RESISTANCE OF THE BACKREST TED 
    • Disconnect: Backrest TED C3311.
    • Measure the resistance between backrest TED C3311 pin 1 and pin 3, component side.
      Fig 4: Measuring Resistance Between Backrest TED C3311 Pin 1 And Pin 3, Component Side
      G07788896Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
    1. Yes  : REPAIR circuit CHS06 (BU/BN) or RHS06 (WH) for an open. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
    2. No  : INSTALL a new backrest TED. REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  10. AP10 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305C.
    • Ignition ON.
    • Measure the voltage between:
      • DCSM C3305C-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM C3305C-3, circuit VHS23 (BN/BU), harness side and ground.
      Fig 5: Measuring Voltage Between DCSM C3305C-8, Circuit CHS08 (BN/YE), Harness Side And Ground
      G07788897Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP11  .
  11. AP11 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • DCSM C3305C-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM C3305C-3, circuit VHS23 (BN/BU), harness side and ground.
      Fig 6: Measuring Resistance Between DCSM C3305C-8, Circuit CHS08 (BN/YE), Harness Side And Ground
      G07788898Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes  : GO to AP12  .
    2. No  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  12. AP12 CHECK THE BLOWER MOTOR AND WIRING RESISTANCE 
      NOTE: The ohmmeter must be connected with the positive lead to DCSM C3305C-8, circuit CHS08 (BN/YE) and the negative lead to DCSM C3305C-7, circuit RHS08 (VT/WH) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 7: Measuring Resistance Between DCSM C3305C-8, Circuit CHS08 (BN/YE) And DCSM C3305C-7, Circuit RHS08 (VT/WH)
      G07788899Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305C-8, circuit CHS08 (BN/YE), harness side and DCSM C3305C-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 4,000 and 10,000 ohms? 
    1. Yes  : GO to  AP14.
    2. No  : GO to AP13  .
  13. AP13 CHECK THE BLOWER MOTOR RESISTANCE 
    • Disconnect: Cushion TED C3303.
      • 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 will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 8: Measuring Resistance Between Cushion TED C3303 Pin 2 And Pin 4, Component Side
      G07788900Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3303 pin 2 and pin 4, component side.
    • Is the resistance between 4,000 and 10,000 ohms? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new cushion TED. REFER to SEAT CUSHION THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  14. AP14 CHECK THE BLOWER MOTOR SPEED CONTROL AND CIRCUIT RESISTANCE 
      NOTE: The ohmmeter must be connected with the positive lead to C3305C-3, circuit VHS23 (BN/BU), harness side and the negative lead to C3305C-7, circuit RHS08 (VT/WH), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 9: Measuring Resistance Between DCSM C3305C-3, Circuit VHS23 (BN/BU) And DCSM C3305C-7, Circuit RHS08 (VT/WH)
      G07788901Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305C-3, circuit VHS23 (BN/BU), harness side and DCSM C3305C-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 240 kohms and 4 megohms? 
    1. Yes  : GO to  AP16.
    2. No  : GO to AP15  .
  15. AP15 CHECK THE BLOWER MOTOR SPEED CONTROL RESISTANCE 
    • Disconnect: Cushion TED C3303.
      • 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 will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 10: Measuring Resistance Between Cushion TED C3303 Pin 7 And Pin 4, Component Side
      G07788902Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3303 pin 7 and pin 4, component side.
    • Is the resistance between 240 kohms and 4 megohms? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new cushion TED. REFER to SEAT CUSHION THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  16. AP16 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM C3305B.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module 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 & CABLES -- FUSION, MILAN & MKZ article.
    • Ignition ON.
    • Measure the voltage between DCSM C3305B-2, circuit VHS27 (WH/OG), harness side and ground.
      Fig 11: Measuring Voltage Between DCSM C3305B-2, Circuit VHS27 (WH/OG) And Ground
      G07788903Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP17  .
  17. AP17 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM C3305B-2, circuit VHS27 (WH/OG), harness side and ground.
      Fig 12: Measuring Resistance Between DCSM C3305B-2, Circuit VHS27 (WH/OG) And Ground
      G07788904Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to AP18  .
    2. No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  18. AP18 CHECK THE THERMISTOR AND WIRING RESISTANCE 
    • Measure the resistance between DCSM C3305B-2, circuit VHS27 (WH/OG), harness side and DCSM C3305B-3, circuit RHS10 (BU/OG), harness side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE 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
      Fig 13: Measuring Resistance Between DCSM C3305B-2, Circuit VHS27 (WH/OG) And DCSM C3305B-3, Circuit RHS10 (BU/OG)
      G07788905Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
    1. Yes  : INSTALL a new DCSM. REFER to DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM)  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP19  .
  19. AP19 CHECK THE THERMISTOR RESISTANCE 
    • Disconnect: Cushion TED C3303.
    • Measure the resistance between cushion TED pin 5 and pin 8, component side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE 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
      Fig 14: Measuring Resistance Between Cushion TED Pin 5 And Pin 8, Component Side
      G07788906Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new cushion TED. REFER to SEAT CUSHION THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  20. AP20 CHECK FOR CORRECT TED INSTALLATION AND FOR CRUSHED FOAM 
    • Ignition OFF.
    • Remove the seat. Refer to SEAT - FRONT  in this service information.
    • Remove the seat backrest trim cover. Refer to SEAT BACKREST - FRONT  in this service information.
    • Inspect the seat backrest for the following:
      • Is the backrest blower obstructed?
      • Is the blower filter restricted or plugged?
      • Is the TED correctly installed?
      • Is the seat backrest foam pad crushed or restricted?
      • Is the climate controlled seat manifold crushed or restricted?
    • Is the TED correctly installed and the foam pad and manifold OK? 
    1. Yes  : GO to AP21  .
    2. No  : Correctly INSTALL the backrest TED or INSTALL a new seat backrest foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  21. AP21 CHECK THE CUSHION TED GROUND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM C3305A.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module 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 & CABLES -- FUSION, MILAN & MKZ article.
    • Ignition ON.
    • Measure the voltage between DCSM C3305A-B, circuit RHS07 (BU), harness side and ground.
      Fig 15: Measuring Voltage Between DCSM C3305A-B, Circuit RHS07 (BU), Harness Side And Ground
      G07788907Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP22  .
  22. AP22 CHECK THE CUSHION TED FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM C3305A-A, circuit CHS07 (GY/BU), harness side and ground.
      Fig 16: Measuring Resistance Between DCSM C3305A-A, Circuit CHS07 (GY/BU), Harness Side And Ground
      G07788908Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to AP23  .
    2. No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  23. AP23 CHECK THE CUSHION TED AND WIRING RESISTANCE 
    • Measure the resistance between DCSM C3305A-A circuit CHS07 (GY/BU), harness side and DCSM C3305A-B, circuit RHS07 (BU), harness side.
      Fig 17: Measuring Resistance Between DCSM C3305A-A Circuit CHS07 (GY/BU) And DCSM C3305A-B, Circuit RHS07 (BU)
      G07788909Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
    1. Yes  : GO to  AP25.
    2. No  : GO to AP24  .
  24. AP24 CHECK THE CUSHION TED RESISTANCE 
    • Disconnect: Cushion TED C3303.
    • Measure the resistance between cushion TED C3303 pin 1 and pin 3, component side.
      Fig 18: Measuring Resistance Between Cushion TED C3303 Pin 1 And Pin 3, Component Side
      G07788910Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
    1. Yes  : REPAIR circuit CHS07 (GY/BU) or RHS07 (BU) for an open. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
    2. No  : INSTALL a new cushion TED. REFER to SEAT CUSHION THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  25. AP25 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305C.
    • Ignition ON.
    • Measure the voltage between:
      • DCSM C3305C-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM C3305C-4, circuit VHS21 (BU/WH), harness side and ground.
      Fig 19: Measuring Voltage Between DCSM C3305C-8, Circuit CHS08 (BN/YE), Harness Side And Ground
      G07788911Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP26  .
  26. AP26 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • DCSM C3305C-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM C3305C-4, circuit VHS21 (BU/WH), harness side and ground.
      Fig 20: Measuring Resistance Between DCSM C3305C-8, Circuit CHS08 (BN/YE), Harness Side And Ground
      G07788912Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes  : GO to AP27  .
    2. No  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  27. AP27 CHECK THE BLOWER MOTOR AND WIRING RESISTANCE 
      NOTE: The ohmmeter must be connected with the positive lead to DCSM C3305C-8, circuit CHS08 (BN/YE) and the negative lead to DCSM C3305C-7, circuit RHS08 (VT/WH) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 21: Measuring Resistance Between DCSM C3305C-8, Circuit CHS08 (BN/YE) And DCSM C3305C-7, Circuit RHS08 (VT/WH)
      G07788913Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305C-8, circuit CHS08 (BN/YE), harness side and DCSM C3305C-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 4,000 and 10,000 ohms? 
    1. Yes  : GO to  AP29.
    2. No  : GO to AP28  .
  28. AP28 CHECK THE BLOWER MOTOR RESISTANCE 
    • Disconnect: Backrest TED C3311.
      • 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 will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 22: Measuring Resistance Between Backrest TED C3311 Pin 2 And Pin 4, Component Side
      G07788914Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED C3311 pin 2 and pin 4, component side.
    • Is the resistance between 4,000 and 10,000 ohms? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new backrest TED. REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  29. AP29 CHECK THE BLOWER MOTOR GROUND CIRCUIT TO BLOWER MOTOR SPEED CONTROL CIRCUIT RESISTANCE 
      NOTE: The ohmmeter must be connected with the positive lead to C3305C-4, circuit VHS21 (BU/WH), harness side and the negative lead to C3305C-7, circuit RHS08 (VT/WH), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 23: Measuring Resistance Between DCSM C3305C-4, Circuit VHS21 (BU/WH) And DCSM C3305C-7, Circuit RHS08 (VT/WH)
      G07788915Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305C-4, circuit VHS21 (BU/WH), harness side and DCSM C3305C-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 240 kohms and 4 megohms? 
    1. Yes  : GO to  AP31.
    2. No  : GO to AP30  .
  30. AP30 CHECK THE BLOWER MOTOR SPEED CONTROL RESISTANCE 
    • Disconnect: Backrest TED C3311.
      • 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 will result in false readings and lead to incorrect identification of components that are not faulty.
      Fig 24: Measuring Resistance Between Backrest TED C3311 Pin 7 And Pin 4, Component Side
      G07788916Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED C3311 pin 7 and pin 4, component side.
    • Is the resistance between 240 kohms and 4 megohms? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new backrest TED. REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
  31. AP31 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305B.
    • Ignition ON.
    • Measure the voltage between DCSM C3305B-4, circuit VHS36 (YE/BU), harness side and ground.
      Fig 25: Measuring Voltage Between DCSM C3305B-4, Circuit VHS36 (YE/BU), Harness Side And Ground
      G07788917Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : GO to AP32  .
  32. AP32 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Side Air Bag Module C313.
    • Measure the resistance between DCSM C3305B-4, circuit VHS36 (YE/BU), harness side and ground.
      Fig 26: Measuring Resistance Between DCSM C3305B-4, Circuit VHS36 (YE/BU), Harness Side And Ground
      G07788918Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to AP33  .
    2. No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  33. AP33 CHECK THE THERMISTOR AND WIRING RESISTANCE AT THE DCSM 
    • Measure the resistance between DCSM C3305B-4, circuit VHS36 (YE/BU), harness side and DCSM C3305B-5, circuit RHS20 (GN/BU), harness side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE 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
      Fig 27: Measuring Resistance Between DCSM C3305B-4, Circuit VHS36 (YE/BU) And DCSM C3305B-5, Circuit RHS20 (GN/BU)
      G07788919Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
    1. Yes  : INSTALL a new DCSM. REFER to DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM)  in this service information. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
    2. No  : GO to AP34  .
  34. AP34 CHECK THE TED THERMISTOR RESISTANCE 
    • Disconnect: Backrest TED C3311.
    • Measure the resistance between backrest TED pin 5 and pin 8, component side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE 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
      Fig 28: Measuring Resistance Between Backrest TED Pin 5 And Pin 8, Component Side
      G07788920Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
    1. Yes  : REPAIR the circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new backrest TED. REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE  in this service information. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

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