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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1311 (Seating) >> Diagnosis And Testing >> Seats >> Pinpoint Test V: DTC B2729 - Cushion Over-Temp Detected/DTC B2730 - Back Over-Temp Detected/DTC B2731 - Differential Temperature Fault - Driver Seat >> Pinpoint Test V: DTC B2729 - Cushion Over-Temp Detected/DTC B2730 - Back Over-Temp Detected/DTC B2731 - Differential Temperature Fault - Driver Seat

Pinpoint Test V: DTC B2729 - Cushion Over-Temp Detected/DTC B2730 - Back Over-Temp Detected/DTC B2731 - Differential Temperature Fault - Driver Seat

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The presence of overtemp faults (DTCs B2729, B2730 and B2731) can be induced by incorrect operation of the climate controlled seat system after an initial HEAT setting has been attained. If a HEAT setting is repeatedly turned OFF and ON in an attempt to increase the seat temperature, an overtemp condition can result and the DTC(s) will be set.
NOTE: A condition may exist where one or both climate controlled seats turn OFF shortly after initialization with CCSM DTC B2729 and/or DTC B2731 present. If this condition is present, check for airflow restrictions due to seat cushion manifold crush or air duct disconnection. If only a stand alone DTC B2731 is present, check for an air duct disconnection between the seat backrest and seat cushion. Proceed with the diagnostic procedure and repair as needed.
  1. V1 CHECK THE SEAT CUSHION TED EXHAUST NOZZLE FOR WASTE AIRFLOW 
    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.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in the General Procedures .
    • Disconnect: Driver Seat Side Air Bag Module C316.
    • Connect: Restraint System Diagnostic Tool 418-133 or 501-097 to Driver Seat Side Air Bag Module C316.
    • Connect: Battery Ground Cable.
      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.
    • Key in ON position.
    • Set both front seats to LOW COOL (1 LED illuminated) at the dual automatic temperature control (DATC) module.
    • Check for air exhausting from the seat cushion TED exhaust nozzle and compare it to the air exhausting from the opposite seat.
    • Is air exhausting from the seat cushion TED exhaust nozzle comparable to the air exhausting from the opposite seat? 
    • Yes  : GO to  V4.
    • No  : GO to  V2.
  2. V2 INSPECT THE SEAT CUSHION DUCTS 
    • Key in OFF position.
    • Inspect the seat cushion ducts for damaged, restricted or disconnected ducts.
    • Are any duct(s) damaged, restricted or disconnected? 
    • Yes  : REPAIR or INSTALL new duct(s) as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : GO to  V3.
  3. V3 INSPECT THE SEAT CUSHION TED FOR CORRECT INSTALLATION 
    • Key in OFF position.
    • Inspect the TED for correct installation to the seat cushion.
    • Is the seat cushion TED correctly installed? 
    • Yes  : REMOVE the seat and the seat cushion trim cover. INSPECT for a worn, damaged or incorrectly installed foam wedge, cushion foam or seat cushion trim cover. INSPECT for collapsed airflow channels in the seat cushion foam. REPAIR or INSTALL a new foam wedge, seat cushion foam or seat cushion trim cover as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL the seat cushion TED correctly. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  4. V4 CHECK THE SEAT BACKREST TED EXHAUST NOZZLE FOR WASTE AIRFLOW 
    • Set both front seats to LOW COOL (1 LED illuminated) at the dual automatic temperature control (DATC) module.
    • Check for air exhausting from the seat backrest TED exhaust nozzle and compare it to the air exhausting from the opposite seat.
    • Is air exhausting from the seat backrest TED exhaust nozzle comparable to the air exhausting from the opposite seat? 
    • Yes  : GO to  V7.
    • No  : GO to  V5.
  5. V5 INSPECT THE SEAT BACKREST DUCTS 
    • Inspect the seat backrest ducts for damaged, restricted or disconnected ducts.
    • Are any duct(s) damaged, restricted or disconnected? 
    • Yes  : REPAIR or INSTALL new duct(s) as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : GO to  V6.
  6. V6 INSPECT THE SEAT BACKREST TED FOR CORRECT INSTALLATION 
    • Key in OFF position.
    • Inspect the TED for correct installation to the seat cushion.
    • Is the seat backrest TED correctly installed? 
    • Yes  : REMOVE the seat and the seat backrest trim cover. INSPECT for a worn, damaged or incorrectly installed foam wedge, backrest foam or seat backrest trim cover. INSPECT for collapsed airflow channels in the seat backrest foam. REPAIR or INSTALL a new foam wedge, seat backrest foam or seat backrest trim cover as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL the seat backrest TED correctly. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  7. V7 CHECK THE SEAT CUSHION AND SEAT BACKREST TEMPERATURE PIDs 
    • Enter the following diagnostic mode on the scan tool: CCSM Active Command Menu TED HEAT MODE.
      NOTE: After the active command TED HEAT is commanded to the ON state, the climate controlled seat TED will operate for 15 seconds then turn off.
      NOTE: The CCSM is not the source of the fault if the active command mode is operational. Monitor PIDs CSHTEMP and BKTEMP while commanding the TED HEAT active command ON.
    • Is either PID greater than 185° F (85° C)? 
    • Yes  : If PID CSHTEMP is greater than 185° F (85° C), GO to  V8.

      If PID BK_TEMP is greater than 185° F (85° C), GO to  V17.

    • No  : GO to  V12.
  8. V8 CHECK THE SEAT CUSHION TED TEMPERATURE SENSOR CIRCUITS 8-HC23 (WH/BK) AND 9-HC23 (BN/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Driver Seat Cushion TED C3035.
    • Disconnect: Driver CCSM C3031b.
    • Key in ON position.
    • Measure the voltage between driver seat cushion TED C3035-3, circuit 8-HC23 (WH/BK), harness side and ground; and between driver seat cushion TED C3035-2, circuit 9-HC23 (BN/YE), harness side and ground.
      Fig 1: Checking The Seat Cushion TED Temperature Sensor Circuits 8-HC23 (WH/BK) And 9-HC23 (BN/YE) For A Short To Voltage
      G03999500Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Yes  : GO to  V9.
    • No  : REPAIR the affected circuits. CLEAR the DTCs. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  9. V9 CHECK THE SEAT CUSHION TED TEMPERATURE SENSOR CIRCUITS 8-HC23 (WH/BK) AND 9-HC23 (BN/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between driver seat cushion TED C3035-3, circuit 8-HC23 (WH/BK), harness side and ground; and between driver seat cushion TED C3035-2, circuit 9-HC23 (BN/YE), harness side and ground.
      Fig 2: Measuring Resistance Between Driver Seat Cushion TED C3035-3, Circuit 8-HC23 (WH/BK) And Ground
      G03999501Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to  V10.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  10. V10 CHECK THE SEAT CUSHION TED TEMPERATURE SENSOR CIRCUITS 8-HC23 (WH/BK) AND 9-HC23 (BN/YE) FOR AN OPEN 
    • Measure the resistance between driver seat cushion TED C3035-3, circuit 8-HC23 (WH/BK), harness side and driver CCSM C3031b-18, circuit 8-HC23 (WH/BK), harness side; and between driver seat cushion TED C3035-2, circuit 9-HC23 (BN/YE), harness side and driver CCSM C3031b-17, circuit 9-HC23 (BN/YE), harness side.
      Fig 3: Checking The Seat Cushion TED Temperature Sensor Circuits 8-HC23 (WH/BK) And 9-HC23 (BN/YE) For An Open
      G03999502Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  V11.
    • No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  11. V11 CHECK THE SEAT CUSHION TEMPERATURE SENSOR 
    • Measure the resistance between the seat cushion TED pin 3 and pin 2, component side.
      Fig 4: Checking The Seat Cushion Temperature Sensor
      G03931807Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1,000 ohms? 
    • Yes  : INSTALL a new CCSM and CARRY OUT programmable module installation (PMI). REFER to CLIMATE CONTROLLED SEAT MODULE . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL a new seat cushion TED. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  12. V12 CHECK THE SEAT CUSHION AND SEAT BACKREST TEMPERATURE PIDS 
    • Enter the following diagnostic mode on the scan tool: CCSM Active Command Menu TED HEAT MODE.
      NOTE: After the active command TED HEAT is commanded to the ON state, the climate controlled seat TED will operate for 15 seconds then turn off.
      NOTE: The CCSM is not the source of the fault if the active command mode is operational.

      Monitor PIDs CSHTEMP and BK_TEMP while commanding the TED HEAT active command ON.

    • Did the PID values change? 
    • Yes  : REPAIR the climate controlled seat for airflow leaks. INSPECT the fan, TEDs, ducts, foam wedges, foam pads, trim covers and their connection points and REPAIR as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : If PID CSHTEMP does not change, GO to  V13.

      If PID BK_TEMP does not change, GO to  V21.

  13. V13 CHECK THE SEAT CUSHION TED HEATING ELEMENT CIRCUITS 31S-HC17 (BK/OG) AND 20S-HC17 (PK) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Driver Seat Cushion TED C3035.
    • Disconnect: Driver CCSM C3031b.
    • Key in ON position.
    • Measure the voltage between driver seat cushion TED C3035-4, circuit 31S-HC17 (BK/OG), harness side and ground; and between driver seat cushion TED C3035-6, circuit 20S-HC17 (PK), harness side and ground.
      Fig 5: Checking The Seat Cushion TED Heating Element Circuits 31S-HC17 (BK/OG) And 20S-HC17 (PK) For A Short To Voltage
      G03999504Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Yes  : GO to  V14.
    • No  : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  14. V14 CHECK THE SEAT CUSHION TED HEATING ELEMENT CIRCUITS 31S-HC17 (BK/OG) AND 20S-HC17 (PK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between driver seat cushion TED C3035-4, circuit 31S-HC17 (BK/OG), harness side and ground; and between driver seat cushion TED C3035-6, circuit 20S-HC17 (PK), harness side and ground.
      Fig 6: Checking The Seat Cushion TED Heating Element Circuits 31S-HC17 (BK/OG) And 20S-HC17 (PK) For A Short To Ground
      G03999505Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  V15.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  15. V15 CHECK THE SEAT CUSHION TED HEATING ELEMENT CIRCUITS 31S-HC17 (BK/OG) AND 20S-HC17 (PK) FOR AN OPEN 
    • Measure the resistance between driver seat cushion TED C3035-4, circuit 31S-HC17 (BK/OG), harness side and driver CCSM C3031b-2, circuit 31S-HC17 (BK/OG), harness side; and between driver seat cushion TED C3035-6, circuit 20S-HC17 (PK), harness side and driver CCSM C3031b-1, circuit 20S-HC17 (PK), harness side.
      Fig 7: Checking Seat Cushion Ted Heating Element Circuits 31S-HC17 (BK/OG) And 20S-HC17 (PK) For Open
      G03999506Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  V16.
    • No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  16. V16 CHECK THE SEAT CUSHION TED 
    • Measure the resistance between the seat cushion TED pin 4 and pin 6, component side.
      Fig 8: Measuring Resistance Between Seat Cushion TED Pins 4 And 6
      G03931819Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.5 and 7 ohms? 
    • Yes  : INSTALL a new CCSM and CARRY OUT programmable module installation (PMI). REFER to CLIMATE CONTROLLED SEAT MODULE . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL a new seat cushion TED. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  17. V17 CHECK THE SEAT BACKREST TED TEMPERATURE SENSOR CIRCUITS 8-HC16 (WH/RD) AND 9-HC16 (BN/RD) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Driver Seat Backrest TED C3034.
    • Disconnect: Driver CCSM C3031b.
    • Key in ON position.
    • Measure the voltage between driver seat backrest TED C3034-3, circuit 8-HC16 (WH/RD), harness side and ground; and between driver seat backrest TED C3034-2, circuit 9-HC16 (BN/RD), harness side and ground.
      Fig 9: Checking Seat Backrest Ted Temperature Sensor Circuits 8-HC16 (WH/RD) And 9-HC16 (BN/RD) For Short To Voltage
      G03999500Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Yes  : GO to  V18.
    • No  : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  18. V18 CHECK THE SEAT BACKREST TED TEMPERATURE SENSOR CIRCUITS 8-HC16 (WH/RD) AND 9-HC16 (BN/RD) FOR A SHORT TO GROUND 
    • Measure the resistance between driver seat backrest TED C3034-3, circuit 8-HC16 (WH/RD), harness side and ground; and between driver seat backrest TED C3034-2, circuit 9-HC16 (BN/RD), harness side and ground.
      Fig 10: Checking Seat Backrest Ted Temperature Sensor Circuits 8-HC16 (WH/RD) And 9-HC16 (BN/RD) For Short To Ground
      G03999501Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  V19.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  19. V19 CHECK THE SEAT BACKREST TED TEMPERATURE SENSOR CIRCUITS 8-HC16 (WH/RD) AND 9-HC16 (BN/RD) FOR AN OPEN 
    • Measure the resistance between driver seat backrest TED C3034-3, circuit 8-HC16 (WH/RD), harness side and driver CCSM C3031b-19, circuit 8-HC16 (WH/RD), harness side; and between driver seat backrest TED C3034-2, circuit 9-HC16 (BN/RD), harness side and driver CCSM C3031b-20, circuit 9-HC16 (BN/RD), harness side.
      Fig 11: Checking Seat Backrest Ted Temperature Sensor Circuits 8-HC16 (WH/RD) And 9-HC16 (BN/RD) For Open
      G03999510Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  V20.
    • No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  20. V20 CHECK THE SEAT BACKREST TEMPERATURE SENSOR 
    • Measure the resistance between the seat backrest TED pin 2 and pin 3, component side.
      Fig 12: Measuring Resistance Between Backrest TED Pin 2 And Pin 3
      G03931807Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1,000 ohms? 
    • Yes  : INSTALL a new CCSM and CARRY OUT programmable module installation (PMI). REFER to CLIMATE CONTROLLED SEAT MODULE . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL a new seat backrest TED. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  21. V21 CHECK THE SEAT BACKREST TED HEATING ELEMENT CIRCUITS 31S-HC16 (BK/BU) AND 20S-HC16 (PK/BU) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Driver Seat Backrest TED C3034.
    • Disconnect: Driver CCSM C3031b.
    • Key in ON position.
    • Measure the voltage between driver seat backrest TED C3034-4, circuit 31S-HC16 (BK/BU), harness side and ground; and between driver seat backrest TED C3034-6, circuit 20S-HC16 (PK/BU), harness side and ground.
      Fig 13: Checking Seat Backrest Ted Heating Element Circuits 31S-HC16 (BK/BU) And 20S-HC16 (PK/BU) For Short To Voltage
      G03999504Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Yes  : GO to  V22.
    • No  : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  22. V22 CHECK THE SEAT BACKREST TED HEATING ELEMENT CIRCUITS 31S-HC16 (BK/BU) AND 20S-HC16 (PK/BU) FOR A SHORT TO GROUND 
    • Measure the resistance between driver seat backrest TED C3034-4, circuit 31S-HC16 (BK/BU), harness side and ground; and between driver seat backrest TED C3034-6, circuit 20S-HC16 (PK/BU), harness side and ground.
      Fig 14: Checking Seat Backrest Ted Heating Element Circuits 31S-HC16 (BK/BU) And 20S-HC16 (PK/BU) For Short To Ground
      G03999505Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  V23.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  23. V23 CHECK THE SEAT BACKREST TED HEATING ELEMENT CIRCUITS 31S-HC16 (BK/BU) AND 20S-HC16 (PK/BU) FOR AN OPEN 
    • Measure the resistance between driver seat backrest TED C3034-4, circuit 31S-HC16 (BK/BU), harness side and driver CCSM C3031b-12, circuit 31S-HC16 (BK/BU), harness side; and between driver seat backrest TED C3034-6, circuit 20S-HC16 (PK/BU), harness side and driver CCSM C3031 b-11, circuit 20S-HC16 (PK/BU), harness side.
      Fig 15: Checking Seat Backrest Ted Heating Element Circuits 31S-HC16 (BK/BU) And 20S-HC16 (PK/BU) For Open
      G03999514Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  V24.
    • No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  24. V24 CHECK THE SEAT BACKREST TED 
    • Measure the resistance between the seat backrest TED pin 4 and pin 6, component side.
      Fig 16: Measuring Resistance Between The Seat Backrest TED Pin 4 And Pin 6
      G03931819Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.5 and 7 ohms? 
    • Yes  : INSTALL a new CCSM and CARRY OUT programmable module installation (PMI). REFER to CLIMATE CONTROLLED SEAT MODULE . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL a new seat backrest TED. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
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