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Pinpoint Test AQ: DTC B272D - Passenger Differential Temperature Fault

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The air bag warning indicator illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. AQ1 CHECK THE CCSM FOR DTCS 
    • Enter the following diagnostic mode on the diagnostic tool: Climate Controlled Seat Module (CCSM) Self Test/Retrieve DTCs
    • Was DTC B272A or B272B retrieved in the self-test as an on-demand or a continuous DTC? 
    1. YES  : For DTC B272A, go to Pinpoint Test AN . For DTC B272B, go to Pinpoint Test AO .
    2. NO  : Go to  AQ2.
  2. AQ2 MONITOR THE CCSM TED TEMPERATURE PIDS 
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/PID: CCSM TED Temperature PIDs
      • CAUTION: Make sure the temperature of the climate controlled seats has stabilized before monitoring the PIDs.
    • 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  AQ3.
    2. NO  : If the front passenger seat cushion PID varies 10°C (18°F) or more from ambient temperature, go to  AQ16.

      If the front passenger seat backrest PID varies 10°C (18°F) or more from ambient temperature, go to  AQ31.

  3. AQ3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR THE BACKREST 
    • Key in OFF position.
    • Key in ON position.
      • 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 CCSM self test and go to the Climate Controlled Seat Module (CCSM) Diagnostic Trouble Code (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 EATC 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 30°C (54°F) from each other? 
    1. YES  : If the front passenger seat cushion PID is 30°C (54°F) hotter than the backrest PID, go to  AQ5.

      If the front passenger seat backrest PID is 30°C (54°F) hotter than the cushion PID, go to  AQ20.

    2. NO  : Go to  AQ4.
  4. AQ4 CHECK THE TEDS COOLING PERFORMANCE 
    1. 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.
    2. 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. AQ5 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT CUSHION 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
      • 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.
    • Remove the seat. Refer to Seat - Front .
    • Remove the seat cushion trim 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? 
    1. YES  : Go to  AQ6.
    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.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  6. AQ6 CHECK THE BACKREST TED CIRCUIT RHS06 (WH) FOR SHORT TO VOLTAGE 
    • Disconnect: CCSM C3036a
    • Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Key in ON position.
      • Fig 1: Measuring Voltage Between CCSM C3036A-D, Circuit RHS06 (WH), Harness Side & Ground
      GF0021432Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036a-D, circuit RHS06 (WH), harness side and ground.
    • Is the voltage less than 0.5 volt? 
    1. YES  : Go to  AQ7.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  7. AQ7 CHECK THE BACKREST TED CIRCUIT CHS06 (BU/BN) FOR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 2: Measuring Resistance Between CCSM C3036A-C, Circuit RHS06 (WH), Harness Side & Ground
      GF0021433Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036a-C, circuit CHS06 (BU/BN), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  AQ8.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  8. AQ8 CHECK RESISTANCE OF THE BACKREST TED AND WIRING 
      Fig 3: Measuring Resistance Between CCSM C3036A-C & CCSM C3036A-D, Circuit CHS06 (BU/BN) & RHS06 (WH)
      GF0021434Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036a-C, circuit CHS06 (BU/BN), harness side and CCSM C3036a-D, circuit RHS06 (WH), harness side.
    • Is the resistance between 0.9 and 10 ohms? 
    1. YES  : Go to  AQ10.
    2. NO  : Go to  AQ9.
  9. AQ9 CHECK RESISTANCE OF THE BACKREST TED 
    • Disconnect: Backrest TED C3326
      • Fig 4: Measuring Resistance Between Backrest TED C3326 Pin 1 & Pin 3, Component Side
      GF0021380Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED C3326 pin 1 and pin 3, component side.
    • Is the resistance between 0.9 and 10 ohms? 
    1. YES  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  10. AQ10 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: CCSM C3036c
    • Key in ON position.
      • Fig 5: Measuring Voltage Between CCSM C3036C-8 & C3036C-3, Circuit CHS08 (BN/YE) & VHS23 (BN/BU)
      GF0021435Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and ground and between CCSM C3036c-3, circuit VHS23 (BN/BU), harness side and ground.
    • Are the voltages less than 1 volt? 
    1. YES  : Go to  AQ11.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  11. AQ11 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 6: Measuring Resistance Between CCSM C3036C-8 & C3036C-3, Circuit CHS08 (BN/YE) & VHS23 (BN/BU)
      GF0021436Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and ground and between CCSM C3036c-3, circuit VHS23 (BN/BU), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  AQ12.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  12. AQ12 CHECK THE BLOWER AND WIRING 
      Fig 7: Measuring Resistance Between CCSM C3036C-8 & C3036C-7, Circuit CHS08 (BN/YE) & RHS08 (VT/WH)
      GF0021437Courtesy of FORD MOTOR CO.
      CAUTION: The ohmmeter must be connected with the positive lead to CCSM C3036c-8, circuit CHS08 (BN/YE) and the negative lead to CCSM C3036c-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.
    • Measure the resistance between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and CCSM C3036c-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : Go to  AQ14.
    2. NO  : Go to  AQ13.
  13. AQ13 CHECK THE BLOWER 
    • Disconnect: Cushion TED C3328
      • Fig 8: Measuring Resistance Between Cushion TED C3328 Pin 2 & Pin 4, Component Side
      GF0021411Courtesy of FORD MOTOR CO.
      CAUTION: 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 C3328 pin 2 and pin 4, component side.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  14. AQ14 CHECK BLOWER SPEED CONTROL AND CIRCUIT 
      Fig 9: Measuring Resistance Between CCSM C3036C-3 & C3036C-7, Circuit VHS23 (BN/BU) & RHS08 (VT/WH)
      GF0021438Courtesy of FORD MOTOR CO.
      CAUTION: The ohmmeter must be connected with the positive lead to C3036c-3, circuit VHS23 (BN/BU), harness side and the negative lead to C3036c-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.
    • Measure the resistance between CCSM C3036c-3, circuit VHS23 (BN/BU) harness side and CCSM C3036c-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : Go to  AQ16.
    2. NO  : Go to  AQ15.
  15. AQ15 CHECK THE BLOWER SPEED CONTROL 
    • Disconnect: Cushion TED C3328
      • Fig 10: Measuring Resistance Between Cushion TED C3328 Pin 7 & Pin 4, Component Side
      GF0021412Courtesy of FORD MOTOR CO.
      CAUTION: 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 C3328 pin 7 and pin 4, component side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  16. AQ16 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: CCSM 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.
    • Key in ON position.
      • Fig 11: Measuring Voltage Between CCSM C3036B-2, Circuit VHS27 (WH/OG), Harness Side & Ground
      GF0021439Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036b-2, circuit VHS27 (WH/OG), harness side and ground.
    • Is the voltage less than 0.5 volt? 
    1. YES  : Go to  AQ17.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  17. AQ17 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 12: Measuring Resistance Between CCSM C3036B-2, Circuit VHS27 (WH/OG), Harness Side & Ground
      GF0021440Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-2, circuit VHS27 (WH/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  AQ18.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  18. AQ18 CHECK THE THERMISTOR AND WIRING 
      Fig 13: Measuring Resistance Between CCSM C3036B-2 & C3036b-3, Circuit VHS27 (WH/OG) & RHS10 (BU/OG)
      GF0021441Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-2, circuit VHS27 (WH/OG), harness side and CCSM C3036b-3, circuit RHS10 (BU/OG), harness side. Note the ambient temperature and refer to the following table.
      Temperature Resistance
      0-10°C (32-50°F) 2782-1663 ohms
      10-20°C (50-68°F) 1837-1140 ohms
      20-30°C (68-86°F) 1260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
    • Is the resistance within the limits indicated? 
    1. YES  : INSTALL a new CCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : Go to  AQ19.
  19. AQ19 CHECK THE THERMISTOR 
    • Disconnect: Cushion TED C3328
      • Fig 14: Measuring Resistance Between Cushion TED Pin 5 & Pin 8, Component Side
      GF0021408Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED 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) 2782-1663 ohms
      10-20°C (50-68°F) 1837-1140 ohms
      20-30°C (68-86°F) 1260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
    • Is the resistance within the limits indicated? 
    1. YES  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  20. AQ20 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT BACKREST 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Remove the seat. Refer to Seat - Front .
    • Remove the seat backrest trim 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? 
    1. YES  : Go to  AQ21.
    2. 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 .

  21. AQ21 CHECK CUSHION TED CIRCUIT RHS07 (BU) FOR SHORT TO VOLTAGE 
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: CCSM C3036a
      • NOTE: Do not connect the safety belt buckle pretensioner or seat side air bag (if equipped) electrical connectors at this time.
    • Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
    • Connect the battery ground cable.
    • Key in ON position.
      • Fig 15: Measuring Voltage Between CCSM C3036A-B, Circuit RHS07 (BU), Harness Side & Ground
      GF0021442Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036a-B, circuit RHS07 (BU), harness side and ground.
    • Is the voltage less than 0.5 volt? 
    1. YES  : Go to  AQ22.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  22. AQ22 CHECK THE CUSHION TED CIRCUIT CHS07 (GY/BU) FOR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 16: Measuring Resistance Between CCSM C3036A-A, Circuit CHS07 (GY/BU), Harness Side & Ground
      GF0021443Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036a-A, circuit CHS07 (GY/BU), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  AQ23.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  23. AQ23 CHECK RESISTANCE OF THE CUSHION TED AND WIRING 
      Fig 17: Measuring Resistance Between CCSM C3036A-A & C3036A-B, Circuit CHS07 (GY/BU) & RHS07 (BU)
      GF0021444Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036a-A circuit CHS07 (GY/BU), harness side and CCSM C3036a-B, circuit RHS07 (BU), harness side.
    • Is the resistance between 0.9 and 10 ohms? 
    1. YES  : Go to  AQ25.
    2. NO  : Go to  AQ24.
  24. AQ24 CHECK RESISTANCE OF THE CUSHION TED 
    • Disconnect: Cushion TED C3328
      • Fig 18: Measuring Resistance Between Cushion TED C3328 Pin 1 & Pin 3, Component Side
      GF0021380Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3328 pin 1 and pin 3, component side.
    • Is the resistance between 0.9 and 10 ohms? 
    1. YES  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  25. AQ25 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: CCSM C3036c
    • Key in ON position.
      • Fig 19: Measuring Voltage Between CCSM C3036C-8 & C3036C-4, Circuit CHS08 (BN/YE) & VHS21 (BU/WH)
      GF0021445Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and ground and between CCSM C3036c-4, circuit VHS21 (BU/WH), harness side and ground.
    • Are the voltages less than 1 volt? 
    1. YES  : Go to  AQ26.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  26. AQ26 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 20: Measuring Resistance Between CCSM C3036C-8 & C3036C-4, Circuit CHS08 (BN/YE) & VHS21 (BU/WH)
      GF0021446Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and ground and between CCSM C3036c-4, circuit VHS21 (BU/WH), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  AQ27.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  27. AQ27 CHECK THE BLOWER AND WIRING 
      Fig 21: Measuring Resistance Between CCSM C3036C-8 & C3036C-7, Circuit CHS08 (BN/YE) & RHS08 (VT/WH)
      GF0021437Courtesy of FORD MOTOR CO.
      CAUTION: The ohmmeter must be connected with the positive lead to CCSMC3036c-8, circuit CHS08 (BN/YE) and the negative lead to CCSM C3036c-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.
    • Measure the resistance between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and CCSM C3036c-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : Go to  AQ29.
    2. NO  : Go to  AQ28.
  28. AQ28 CHECK THE BLOWER 
    • Disconnect: Backrest TED C3326
      • Fig 22: Measuring Resistance Between Backrest TED C3326 Pin 2 & Pin 4, Component Side
      GF0021411Courtesy of FORD MOTOR CO.
      CAUTION: 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 C3326 pin 2 and pin 4, component side.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  29. AQ29 CHECK BLOWER SPEED CONTROL AND CIRCUIT 
      Fig 23: Measuring Resistance Between CCSM C3036C-4 & C3036C-7, Circuit VHS21 (BU/WH) & RHS08 (VT/WH)
      GF0021447Courtesy of FORD MOTOR CO.
      CAUTION: The ohmmeter must be connected with the positive lead to C3036c-4, circuit VHS21 (BU/WH), harness side and the negative lead to C3036c-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.
    • Measure the resistance between CCSM C3036c-4, circuit VHS21 (BU/WH) harness side and CCSM C3036c-7, circuit RHS08 (VT/WH), harness side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : Go to  AQ31.
    2. NO  : Go to  AQ30.
  30. AQ30 CHECK THE BLOWER SPEED CONTROL 
    • Disconnect: Backrest TED C3326
      • Fig 24: Measuring Resistance Between Backrest TED C3326 Pin 7 & Pin 4, Component Side
      GF0021412Courtesy of FORD MOTOR CO.
      CAUTION: 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 C3326 pin 7 and pin 4, component side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  31. AQ31 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: CCSM 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.
    • Key in ON position.
      • Fig 25: Measuring Voltage Between CCSM C3036B-4, Circuit VHS36 (YE/BU), Harness Side & Ground
      GF0021448Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036b-4, circuit VHS36 (YE/BU), harness side and ground.
    • Is the voltage less than 0.5 volt? 
    1. YES  : Go to  AQ32.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  32. AQ32 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 26: Measuring Resistance Between CCSM C3036B-4, Circuit VHS36 (YE/BU), Harness Side & Ground
      GF0021449Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-4, circuit VHS36 (YE/BU), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  AQ33.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  33. AQ33 CHECK THE THERMISTOR AND WIRING 
      Fig 27: Measuring Resistance Between CCSM C3036B-4 & C3036B-5, Circuit VHS36 (YE/BU) & RHS20 (GN/BU)
      GF0021450Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-4, circuit VHS36 (YE/BU), harness side and CCSM C3036b-5, circuit RHS20 (GN/BU), harness side. Note the ambient temperature and refer to the following table.
      Temperature Resistance
      0-10°C (32-50°F) 2782-1663 ohms
      10-20°C (50-68°F) 1837-1140 ohms
      20-30°C (68-86°F) 1260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
    • Is the resistance within the limits indicated? 
    1. YES  : INSTALL a new CCSM and CARRY OUT PMI. REFER to Climate Controlled Seat Module . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : Go to  AQ34.
  34. AQ34 CHECK THE THERMISTOR 
    • Disconnect: Backrest TED C3326
      • Fig 28: Measuring Resistance Between Backrest TED Pin 5 & Pin 8, Component Side
      GF0021408Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED 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) 2782-1663 ohms
      10-20°C (50-68°F) 1837-1140 ohms
      20-30°C (68-86°F) 1260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
    • Is the resistance within the limits indicated? 
    1. YES  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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