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Pinpoint Test At: DTC B272C

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 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. AT1 CHECK THE DCSM FOR DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - DCSM  .
    • Was DTC B2729 or B2730 retrieved in the self-test? 
  2. AT2 MONITOR THE DCSM 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 PID values of the driver seat to those of the front passenger seat. This can help identify if there is a concern with the driver seat cushion or backrest PID readings.
    • Are both driver seat TED temperature PID values within 10°C (18°F) of the ambient temperature? 
    • Yes:  GO to AT3  .
    • No:  If the driver seat cushion PID value varies 10°C (18°F) or more from ambient temperature, GO to  AT16.

      If the driver seat backrest PID value varies 10°C (18°F) or more from ambient temperature, GO to  AT31.

  3. AT3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR THE BACKREST 
    • 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 CHART  to continue diagnostics.
    • After cycling the ignition switch and with the engine running, set the driver seat to high heat (3 LEDs 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? 
    • Yes:  If the driver seat cushion PID value is 60°C (108°F) hotter than the backrest PID value, GO to  AT5.

      If the driver seat backrest PID value is 60°C (108°F) hotter than the cushion PID value, GO to  AT20.

    • No:  GO to AT4  .
  4. AT4 CHECK THE TEDs COOLING PERFORMANCE 
    • Yes:  The DTC may have been set by extreme cabin temperatures or excessive sun-load 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.
    • No:  CHECK the affected seat cushion or backrest for correct installation of the climate controlled seat components (TED  , manifold, air ducts and foam pad). CHECK for airflow restrictions (TED  inlets and outlets, TED  -to-manifold 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. AT5 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT CUSHION 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Remove the seat. Refer to SEAT - FRONT .
    • Remove the seat cushion cover. Refer to SEAT CUSHION COVER - FRONT .
    • 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 are there no signs of damage to the foam pad and manifold? 
    • Yes:  GO to AT6  .
    • No:  Correctly INSTALL the cushion TED  or INSTALL a new seat cushion foam pad and/or climate controlled seat manifold. CONNECT the battery ground cable. REPEAT the self-test. CLEAR the DTCs.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  6. AT6 CHECK BACKREST TED CIRCUIT RHS01 (WH/VT) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS  . Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag C327.
    • Disconnect: DCSM  C3036a.
      • NOTE: Do not connect the seat side air bag electrical connector at this time.
    • Position the driver seat in the vehicle and connect the seat-to-floor connectors.
      • 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 AND CABLES .
    • Ignition ON.
    • Measure the voltage between DCSM  C3036a-K, circuit RHS01 (WH/VT), harness side and ground.
      Fig 1: Measuring Voltage Between DCSM C3036a-K, Circuit RHS01 (WH/VT), Harness Side And Ground
      G06076968Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

    • No:  GO to AT7  .
  7. AT7 CHECK BACKREST TED CIRCUIT CHS01 (GY/VT) FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3036a-J, circuit CHS01 (GY/VT), harness side and ground.
      Fig 2: Measuring Resistance Between DCSM C3036a-J, Circuit CHS01 (GY/VT), Harness Side And Ground
      G06076969Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to AT8  .
    • No:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  8. AT8 CHECK THE RESISTANCE OF THE BACKREST TED AND WIRING 
    • Measure the resistance between:
      • DCSM  C3036a-J, circuit CHS01 (GY/VT), harness side and ground.
      • DCSM  C3036a-K, circuit RHS01 (WH/VT), harness side and ground.
        Fig 3: Measuring Resistance Between DCSM C3036a-J, Circuit CHS01 (GY/VT), Harness Side And Ground
        G06076910Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
    • Yes:  GO to  AT10.
    • No:  GO to AT9  .
  9. AT9 CHECK THE RESISTANCE OF THE BACKREST TED 
    • Disconnect: Backrest TED  C3322.
    • Measure the resistance between backrest TED  C3322 pin 1 and pin 3, component side.
      Fig 4: Measuring Resistance Between Backrest TED C3322 Pin 1 And Pin 3, Component Side
      G06076908Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
  10. AT10 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM  C3036c.
    • Ignition ON.
    • Measure the voltage between:
      • DCSM  C3036c-16, circuit CHS03 (GN/BN), harness side and ground.
      • DCSM  C3036c-11, circuit VHS18 (BN/GN), harness side and ground.
        Fig 5: Measuring Voltage Between DCSM C3036c-16, Circuit CHS03 (GN/BN), Harness Side And Ground
        G06076972Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    • Yes:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

    • No:  GO to AT11  .
  11. AT11 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • DCSM  C3036c-16, circuit CHS03 (GN/BN), harness side and ground.
      • DCSM  C3036c-11, circuit VHS18 (BN/GN), harness side and ground.
        Fig 6: Measuring Resistance Between DCSM C3036c-16, Circuit CHS03 (GN/BN), Harness Side And Ground
        G06134468Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to AT12  .
    • No:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  12. AT12 CHECK THE BLOWER AND WIRING 
      NOTE: The ohmmeter must be connected with the positive lead to Dual Climate Controlled Seat Module (DCSM) C3036c-16, circuit CHS03 (GN/BN) and the negative lead to DCSM  C3036c-15, circuit RHS03 (GY/OG) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
    • Measure the resistance between DCSM  C3036c-16, circuit CHS03 (GN/BN), harness side and DCSM  C3036c-15, circuit RHS03 (GY/OG), harness side.
      Fig 7: Measuring Resistance Between DCSM C3036c-16, Circuit CHS03 (GN/BN) And DCSM C3036c-15, Circuit RHS03 (GY/OG)
      G06076974Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 ohms and 10,000 ohms? 
    • Yes:  GO to  AT14.
    • No:  GO to AT13  .
  13. AT13 CHECK THE BLOWER 
    • Disconnect: Cushion TED  C3327.
      • 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.
    • Measure the resistance between cushion TED  C3327 pin 2 and pin 4, component side.
      Fig 8: Measuring Resistance Between Cushion TED C3327 Pin 2 And Pin 4, Component Side
      G06077017Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 ohms and 10,000 ohms? 
  14. AT14 CHECK BLOWER SPEED CONTROL AND BLOWER GROUND CIRCUIT 
      NOTE: The ohmmeter must be connected with the positive lead to C3036c-11, circuit VHS18 (BN/GN), harness side and the negative lead to C3036c-15, circuit RHS03 (GY/OG), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
    • Measure the resistance between DCSM  C3036c-11, circuit VHS18 (BN/GN), harness side and DCSM  C3036c-15, circuit RHS03 (GY/OG), harness side.
      Fig 9: Measuring Resistance Between DCSM C3036c-11, Circuit VHS18 (BN/GN) And DCSM C3036c-15, Circuit RHS03 (GY/OG)
      G06076976Courtesy of FORD MOTOR CO.
    • Is the resistance between 240,000 ohms and 420,000 ohms? 
    • Yes:  GO to  AT16.
    • No:  GO to AT15  .
  15. AT15 CHECK THE BLOWER SPEED CONTROL 
    • Disconnect: Cushion TED  C3327.
      • 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.
    • Measure the resistance between cushion TED  C3327 pin 7 and pin 4, component side.
      Fig 10: Measuring Resistance Between Cushion TED C3328 Pin 7 And Pin 4, Component Side
      G06076991Courtesy of FORD MOTOR CO.
    • Is the resistance between 240,000 ohms and 420,000 ohms? 
  16. AT16 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag C328.
    • Disconnect: 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 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 AND CABLES .
    • Ignition ON.
    • Measure the voltage between DCSM  C3036b-7, circuit VHS26 (VT), harness side and ground.
      Fig 11: Measuring Voltage Between DCSM C3036b-7, Circuit VHS26 (VT), Harness Side And Ground
      G06076978Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

    • No:  GO to AT17  .
  17. AT17 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3036b-7, circuit VHS26 (VT), harness side and ground.
      Fig 12: Measuring Resistance Between DCSM C3036b-7, Circuit VHS26 (VT), Harness Side And Ground
      G06076979Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to AT18  .
    • No:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  18. AT18 CHECK THE THERMISTOR AND WIRING 
    • Measure the resistance between DCSM  C3036b-7, circuit VHS26 (VT), harness side and DCSM  C3036b-8, circuit RHS05 (YE/VT), harness side. Note the ambient temperature and refer to the following table.
      TEMPERATURE AND RESISTANCE REFERENCE 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 13: Measuring Resistance Between DCSM C3036b-7, Circuit VHS26 (VT) And DCSM C3036b-8, Circuit RHS05 (YE/VT)
      G06134475Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
  19. AT19 CHECK THE THERMISTOR 
    • Disconnect: Cushion TED  C3327.
    • Measure the resistance between cushion TED  pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.
      TEMPERATURE AND RESISTANCE REFERENCE 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 14: Measuring Resistance Between Cushion TED C3328 Pin 5 And Pin 8, Component Side
      G06076995Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
  20. AT20 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT BACKREST 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Remove the seat. Refer to SEAT - FRONT .
    • Remove the seat backrest cover. Refer to SEAT BACKREST COVER - FRONT, WITHOUT FOLD FLAT .
    • 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 are there no signs of damage to the foam pad and manifold? 
    • Yes:  GO to AT21  .
    • No:  Correctly INSTALL the backrest TED  or INSTALL a new seat backrest foam pad and/or climate controlled seat manifold. CONNECT the battery ground cable. REPEAT the self-test. CLEAR the DTCs.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  21. AT21 CHECK THE CUSHION TED CIRCUIT RHS02 (BU/OG) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag C327.
    • Disconnect: DCSM  C3036a.
      • NOTE: Do not connect the seat side air bag electrical connector at this time.
    • Position the driver seat in the vehicle and connect the seat-to-floor connectors.
      • 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 AND CABLES .
    • Ignition ON.
    • Measure the voltage between DCSM  C3036a-H, circuit RHS02 (BU/OG), harness side and ground.
      Fig 15: Measuring Voltage Between DCSM C3036A-H, Circuit RHS02 (BU/OG), Harness Side And Ground
      G06134477Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

    • No:  GO to AT22  .
  22. AT22 CHECK CUSHION TED CIRCUIT CHS02 (YE/BU) FOR SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3036a-G, circuit CHS02 (YE/BU), harness side and ground.
      Fig 16: Measuring Resistance Between DCSM C3036a-G, Circuit CHS02 (YE/BU), Harness Side And Ground
      G06076983Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to AT23  .
    • No:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  23. AT23 CHECK THE RESISTANCE OF THE CUSHION TED AND WIRING 
    • Measure the resistance between DCSM  C3036a-G circuit CHS02 (YE/BU), harness side and DCSM  C3036a-H, circuit RHS02 (BU/OG), harness side.
      Fig 17: Measuring Resistance Between DCSM C3036a-G Circuit CHS02 (YE/BU) And DCSM C3036a-H, Circuit RHS02 (BU/OG)
      G06076984Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
    • Yes:  GO to  AT25.
    • No:  GO to AT24  .
  24. AT24 CHECK THE RESISTANCE OF THE CUSHION TED 
    • Disconnect: Cushion TED  C3327.
    • Measure the resistance between cushion TED  C3327 pin 1 and pin 3, component side.
      Fig 18: Measuring Resistance Between Backrest TED C3322 Pin 1 And Pin 3, Component Side
      G06076908Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
  25. AT25 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM  C3036c.
    • Ignition ON.
    • Measure the voltage between:
      • DCSM  C3036c-16, circuit CHS03 (GN/BN), harness side and ground.
      • DCSM  C3036c-12, circuit VHS16 (BU/GN), harness side and ground.
        Fig 19: Measuring Voltage Between DCSM C3036c-16, Circuit CHS03 (GN/BN), Harness Side And Ground
        G06134481Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    • Yes:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

    • No:  GO to AT26  .
  26. AT26 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • DCSM  C3036c-16, circuit CHS03 (GN/BN), harness side and ground.
      • DCSM  C3036c-12, circuit VHS16 (BU/GN), harness side and ground.
        Fig 20: Measuring Resistance Between DCSM C3036c-16, Circuit CHS03 (GN/BN), Harness Side And Ground
        G06076987Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to AT27  .
    • No:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  27. AT27 CHECK THE BLOWER AND WIRING 
      NOTE: The ohmmeter must be connected with the positive lead to Dual Climate Controlled Seat Module (DCSM) C3036c-16, circuit CHS03 (GN/BN) and the negative lead to DCSM  C3036c-15, circuit RHS03 (GY/OG) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
    • Measure the resistance between DCSM  C3036c-16, circuit CHS03 (GN/BN), harness side and DCSM  C3036c-15, circuit RHS03 (GY/OG), harness side.
      Fig 21: Measuring Resistance Between DCSM C3036c-16, Circuit CHS03 (GN/BN) And DCSM C3036c-15, Circuit RHS03 (GY/OG)
      G06076974Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 ohms and 10,000 ohms? 
    • Yes:  GO to  AT29.
    • No:  GO to AT28  .
  28. AT28 CHECK THE BLOWER 
    • Disconnect: Backrest TED  C3322.
      • 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.
    • Measure the resistance between backrest TED  C3322 pin 2 and pin 4, component side.
      Fig 22: Measuring Resistance Between Cushion TED C3327 Pin 2 And Pin 4, Component Side
      G06077017Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 ohms and 10,000 ohms? 
  29. AT29 CHECK BLOWER SPEED CONTROL AND CIRCUIT 
      NOTE: The ohmmeter must be connected with the positive lead to C3036c-12, circuit VHS16 (BU/GN), harness side and the negative lead to C3036c-15, circuit RHS03 (GY/OG), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
    • Measure the resistance between DCSM  C3036c-12, circuit VHS16 (BU/GN), harness side and DCSM  C3036c-15, circuit RHS03 (GY/OG), harness side.
      Fig 23: Measuring Resistance Between DCSM C3036c-12, Circuit VHS16 (BU/GN) And DCSM C3036c-15, Circuit RHS03 (GY/OG)
      G06134485Courtesy of FORD MOTOR CO.
    • Is the resistance between 240,000 ohms and 420,000 ohms? 
    • Yes:  GO to  AT31.
    • No:  GO to AT30  .
  30. AT30 CHECK THE BLOWER SPEED CONTROL 
    • Disconnect: Backrest TED  C3322.
      • 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.
    • Measure the resistance between backrest TED  C3322 pin 7 and pin 4, component side.
      Fig 24: Measuring Resistance Between Backrest TED C3322 Pin 7 And Pin 4, Component Side
      G06504337Courtesy of FORD MOTOR CO.
    • Is the resistance between 240,000 ohms and 420,000 ohms? 
  31. AT31 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag C328.
    • Disconnect: 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 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 AND CABLES .
    • Ignition ON.
    • Measure the voltage between DCSM  C3036b-9, circuit VHS35 (VT/OG), harness side and ground.
      Fig 25: Measuring Voltage Between DCSM C3036b-9, Circuit VHS35 (VT/OG), Harness Side And Ground
      G06255579Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

    • No:  GO to AT32  .
  32. AT32 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3036b-9, circuit VHS35 (VT/OG), harness side and ground.
      Fig 26: Measuring Resistance Between DCSM C3036b-9, Circuit VHS35 (VT/OG), Harness Side And Ground
      G06255580Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to AT33  .
    • No:  REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C327.

      CONNECT driver seat side air bag module C328.

      REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

  33. AT33 CHECK THE THERMISTOR AND WIRING 
    • 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 table.
      TEMPERATURE AND RESISTANCE REFERENCE 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 27: Measuring Resistance Between DCSM C3036b-9, Circuit VHS35 (VT/OG) And DCSM C3036b-10, Circuit RHS15 (GY/BN)
      G06458706Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
  34. AT34 CHECK THE THERMISTOR 
    • Disconnect: Backrest TED  C3322.
    • Measure the resistance between backrest TED  pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.
      TEMPERATURE AND RESISTANCE REFERENCE 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 28: Measuring Resistance Between Cushion TED C3328 Pin 5 And Pin 8, Component Side
      G06076995Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
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