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Pinpoint Test Ad: DTC B272C - Driver Differential Temperature Fault

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. AD1 CHECK THE DCSM FOR ON-DEMAND DTCS 
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
    NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered.  Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    NOTE: The air bag warning lamp illuminates when the 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.
    • Key in OFF position.
      • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
    • For vehicles with seat side air bags, carry out the following:
      • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
      • Disconnect the driver seat side air bag module C327.
      • Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327.
      • Disconnect the passenger seat side air bag module C313.
      • Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313.
      • Connect the battery ground cable.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Enter the following diagnostic mode on the scan tool: Retrieve Continuous DTCs.
    • Was DTC B2729 or B2730 retrieved during the on-demand self test or as a continuous DTC? 

    Yes  : For DTC B2729, GO to PINPOINT TEST AA .

    For DTC B2730, GO to PINPOINT TEST AF .

    No  : GO to AD2.

  2. AD2 MONITOR THE DCSM TED TEMPERATURE PIDS 
    • Enter the following diagnostic mode on the scan tool: Monitor DCSM 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 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 PIDs within 10°C (18°F) of the ambient temperature? 

    Yes  : GO to AD3.

    No  : If the driver seat cushion PID varies 10°C (18°F) or more from ambient temperature go to  AD15.

    If the driver seat backrest PID varies 10°C (18°F) or more from ambient temperature go to  AD31.

  3. AD3 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 DCSM on-demand self test and go to the DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM) DIAGNOSTIC TROUBLE CODE (DTC) TABLE  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 or backrest PIDs vary more than 10°C(18°F)? 

    Yes  : If the driver seat cushion PID is 10°C (18°F) hotter than the backrest PID, GO to AD4.

    If the driver seat backrest PID is 10°C (18°F) hotter than the cushion PID, GO to  AD19.

    No  : Fault is currently not present. INSPECT for crushed seat cushion or backrest foam pad or climate controlled seat cushion or backrest manifold. CHECK for an intermittent wiring fault. REPAIR as needed. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  4. AD4 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT CUSHION 
    • Key in OFF position.
    • 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? 

    Yes  : GO to AD5.

    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.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. AD5 CHECK THE BACKREST TED- CIRCUIT FOR SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305a.
    • Position the driver seat in the vehicle and connect the seat-to-floor connectors.
    • Key in ON position.
    • Measure the voltage between DCSM C3305a-K, circuit RHS01 (WH/VT), harness side and ground.
      Fig 1: Checking Backrest TED- Circuit For Short To Voltage
      G04683404Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.5 volt? 

    Yes  : GO to AD6.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  6. AD6 CHECK THE BACKREST TED+ CIRCUIT FOR SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and ground.
      Fig 2: Checking Backrest TED+ Circuit For Short To Ground
      G04683405Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to AD7.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  7. AD7 CHECK RESISTANCE OF THE BACKREST TED AND WIRING 
    • Measure the resistance between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and DCSM C3305a-K, circuit RHS01 (WH/VT), harness side.
      Fig 3: Checking Resistance Of Backrest TED And Wiring
      G04683406Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 

    Yes  : GO to  AD9.

    No  : GO to AD8.

  8. AD8 CHECK RESISTANCE OF THE BACKREST TED 
    • Disconnect: Backrest TED C3310.
    • Measure the resistance between backrest TED C3310 pin 1 and pin 3, component side.
      Fig 4: Checking Resistance Of Backrest TED
      G04683407Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  9. AD9 CHECK THE BLOWER+ AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305c.
    • Key in ON position.
    • Measure the voltage between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305C-11, circuit VHS18 (BN/GN), harness side and ground.
      Fig 5: Checking Blower+ And Speed Control Circuits For Short To Voltage
      G04683408Courtesy of FORD MOTOR CO.
    • Are the voltages less than 1 volt? 

    Yes  : GO to AD10.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  10. AD10 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305C-11, circuit VHS18 (BN/GN), harness side and ground.
      Fig 6: Checking Blower And Speed Control Circuits For Short To Ground
      G04683409Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes  : GO to AD11.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  11. AD11 CHECK THE BLOWER AND WIRING 
      CAUTION: The ohmmeter must be connected with the positive lead to DCSM C3305c-16, circuit CHS03 (GN/BN) and the negative lead to DCSM C3305C-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.
      Fig 7: Checking Blower And Wiring
      G04683410Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.
    • Is the resistance between 6 Kohms and 9 Kohms? 

    Yes  : GO to  AD13.

    No  : GO to AD12.

  12. AD12 CHECK THE BLOWER 
    • Disconnect: Cushion TED C3300.
      • 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.
      Fig 8: Checking Blower
      G04683411Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3300 pin 2 and pin 4, component side.
    • Is the resistance between 6 Kohms and 9 Kohms? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  13. AD13 CHECK BLOWER SPEED CONTROL AND CIRCUIT 
      CAUTION: The ohmmeter must be connected with the positive lead to C33050-11, circuit VHS18 (BN/GN), harness side and the negative lead to C3305C-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.
      Fig 9: Checking Blower Speed Control And Circuit
      G04683412Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305c-11, circuit VHS18 (BN/GN) harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.
    • Is the resistance between 290 Kohms and 420 Kohms? 

    Yes  : GO to  AD15.

    No  : GO to AD14.

  14. AD14 CHECK THE BLOWER SPEED CONTROL 
    • Disconnect: Cushion TED C3300.
      • 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.
      Fig 10: Checking Blower Speed Control
      G04683413Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3300 pin 7 and pin 4, component side.
    • Is the resistance between 290 Kohms and 420 Kohms? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  15. AD15 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305b.
    • Key in ON position.
    • Measure the voltage between DCSM C3305b-7, circuit VHS26 (VT), harness side and ground.
      Fig 11: Checking Thermistor Circuit For Short To Voltage
      G04683414Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.5 volt? 

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

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to AD16.

  16. AD16 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between DCSM C3305b-7, circuit VHS26 (VT), harness side and ground.
      Fig 12: Checking Thermistor Circuit For Short To Ground
      G04683415Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to AD17.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  17. AD17 CHECK THE THERMISTOR AND WIRING 
    • Measure the resistance between DCSM C3305b-7, circuit VHS26 (VT), harness side and DCSM C3305b-8, circuit RHS05 (YE/VT), harness side. Note the ambient temperature and refer to the following table.
      TEMPERATURE AND RESISTANCE CHART

      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
      Fig 13: Checking Thermistor And Wiring
      G04683416Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 

    Yes  : INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to CLIMATE CONTROLLED SEAT MODULE . REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to AD18.

  18. AD18 CHECK THE THERMISTOR 
    • Disconnect: Cushion TED C3300.
    • 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 CHART

      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
      Fig 14: Checking Thermistor
      G04683417Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  19. AD19 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT BACKREST 
    • Key in OFF position.
    • Remove the seat. Refer to SEAT - FRONT .
    • Remove the seat backrest trim cover. Refer to SEAT BACKREST COVER - FRONT .
    • 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 AD20.

    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.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  20. AD20 CHECK THE CUSHION TED- CIRCUIT FOR SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305a.
    • Position the driver seat in the vehicle and connect the seat-to-floor connectors.
    • Key in ON position.
    • Measure the voltage between DCSM C3305a-H, circuit RHS02 (BU/OG), harness side and ground.
      Fig 15: Checking Cushion TED- Circuit For Short To Voltage
      G04683418Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.5 volt? 

    Yes  : GO to AD21.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  21. AD21 CHECK THE CUSHION TED+ CIRCUIT FOR SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between DCSM C3305a-G, circuit CHS02 (YE/BU), harness side and ground.
      Fig 16: Checking Cushion TED+ Circuit For Short To Ground
      G04683419Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to AD22.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  22. AD22 CHECK RESISTANCE OF THE CUSHION TED AND WIRING 
    • Measure the resistance between DCSM C3305a-G circuit CHS02 (YE/BU), harness side and DCSM C3305a-H, circuit RHS02 (BU/OG), harness side.
      Fig 17: Checking Resistance Of Cushion TED And Wiring
      G04683420Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 

    Yes  : GO to  AD24.

    No  : GO to AD23.

  23. AD23 CHECK RESISTANCE OF THE CUSHION TED 
    • Disconnect: Cushion TED C3300.
    • Measure the resistance between cushion TED C3300 pin 1 and pin 3, component side.
      Fig 18: Checking Resistance Of Cushion TED
      G04683421Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 

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

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  24. AD24 CHECK THE BLOWER+ AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305c.
    • Key in ON position.
    • Measure the voltage between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305C-12, circuit VHS16 (BU/GN), harness side and ground.
      Fig 19: Checking Blower+ And Speed Control Circuits For Short To Voltage
      G04683422Courtesy of FORD MOTOR CO.
    • Are the voltages less than 1 volt? 

    Yes  : GO to AD25.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  25. AD25 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305C-12, circuit VHS16 (BU/GN), harness side and ground.
      Fig 20: Checking Blower And Speed Control Circuits For Short To Ground
      G04683423Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes  : GO to AD26.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  26. AD26 CHECK THE BLOWER AND WIRING 
      CAUTION: The ohmmeter must be connected with the positive lead to DCSM C3305c-16, circuit CHS03 (GN/BN) and the negative lead to DCSM C3305C-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.
      Fig 21: Checking Blower And Wiring
      G04683424Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.
    • Is the resistance between 6 Kohms and 9 Kohms? 

    Yes  : GO to  AD28.

    No  : GO to AD27.

  27. AD27 CHECK THE BLOWER 
    • Disconnect: Backrest TED C3310.
      • 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.
      Fig 22: Checking Blower
      G04683425Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED C3310 pin 2 and pin 4, component side.
    • Is the resistance between 6 Kohms and 9 Kohms? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  28. AD28 CHECK BLOWER SPEED CONTROL AND CIRCUIT 
      CAUTION: The ohmmeter must be connected with the positive lead to C3305C-12, circuit VHS16 (BU/GN), harness side and the negative lead to C3305C-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.
      Fig 23: Checking Blower Speed Control And Circuit
      G04683426Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305c-12, circuit VHS16 (BU/GN) harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.
    • Is the resistance between 290 Kohms and 420 Kohms? 

    Yes  : GO to  AD30.

    No  : GO to AD29.

  29. AD29 CHECK THE BLOWER SPEED CONTROL 
    • Disconnect: Backrest TED C3310.
      • 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.
      Fig 24: Checking Blower Speed Control
      G04683427Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED C3310 pin 7 and pin 4, component side.
    • Is the resistance between 290 Kohms and 420 Kohms? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  30. AD30 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM C3305b.
    • Key in ON position.
    • Measure the voltage between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and ground.
      Fig 25: Checking Thermistor Circuit For Short To Voltage
      G04683428Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.5 volt? 

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

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to AD31.

  31. AD31 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and ground.
      Fig 26: Checking Thermistor Circuit For Short To Ground
      G04683429Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 volts? 

    Yes  : GO to AD32.

    No  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  32. AD32 CHECK THE THERMISTOR AND WIRING 
    • Measure the resistance between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and DCSM C3305b-10, circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following table.
      TEMPERATURE AND RESISTANCE CHART

      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
      Fig 27: Checking Thermistor And Wiring
      G04683430Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 

    Yes  : INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to CLIMATE CONTROLLED SEAT MODULE . REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to AD33.

  33. AD33 CHECK THE THERMISTOR 
    • Disconnect: Backrest TED C3310.
    • 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 CHART

      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
      Fig 28: Checking Thermistor
      G04683431Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 

    Yes  : REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

    If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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