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Pinpoint Test O: The Heated Seat Is Inoperative - Passenger

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
  1. O1 CHECK VOLTAGE TO THE HEATED SEAT MODULE 
    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 seat mounted side air bag and/or a safety belt pretensioner (if equipped) system is being serviced, the supplemental restraint system (SRS) must be disabled. Refer to AIR BAG RESTRAINT SYSTEMS .
    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.
    • Disable the SRS. Refer to Supplemental Restraint System (SRS) Disabling and Activating in AIR BAG RESTRAINT SYSTEMS .
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C303.
    • Connect: Restraint System Diagnostic Tool 501-097 to the Passenger Safety Belt Buckle Pretensioner C303.
    • Disconnect: Passenger Seat Side Air Bag C337 (Vehicles With Seat Side Air Bags Only).
    • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C337 (Vehicles With Seat Side Air Bags Only).
      • 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.
    • Connect the battery ground cable.
    • Disconnect: Passenger Heated Seat Module C329.
    • Key in ON position.
    • Measure the voltage between passenger heated seat module C329-12, circuit 51 (BK/WH), harness side and ground; and between passenger heated seat module C329-5, circuit 294 (WH/LB), harness side and ground.
      Fig 1: Checking Voltage To The Heated Seat Module
      G03246870Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 

    Yes 

    GO to O2.

    No 

    REPAIR circuit 51 (BK/WH) or circuit 294 (WH/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303. CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337. CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

  2. O2 CHECK THE HEATED SEAT MODULE GROUND 
    • Key in OFF position.
    • Measure the resistance between passenger heated seat module C329-1, circuit 1205 (BK), harness side and ground.
      Fig 2: Checking The Heated Seat Module Ground
      G03246871Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to O3.

    No 

    REPAIR circuit 1205 (BK). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303. CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337. CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

  3. O3 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between passenger heated seat module C329-3, circuit 1061 (BR/LB), harness side and ground; and between C329-4, circuit 1060 (BK/LB), harness side and ground.
      Fig 3: Checking The Heated Seat Temperature Sensor Circuits For A Short To Voltage
      G03246872Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 

    Yes 

    REPAIR circuit 1060 (BK/LB) or circuit 1061 (BR/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303. CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337. CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

    No 

    GO to O4.

  4. O4 CHECK THE HEATED SEAT TEMPERATURE SENSOR 
    • Key in OFF position.
    • Measure the resistance between passenger heated seat module C329-3, circuit 1061 (BR/LB), harness side and C329-4, circuit 1060 (BK/LB), harness side; and between C329-3, circuit 1061 (BR/LB), harness side and ground.
      Fig 4: Checking The Heated Seat Temperature Sensor
      G03246873Courtesy of FORD MOTOR CO.
    • Is the resistance less than 300,000 ohms and greater than 50 ohms between C329-3 and C329-4 and greater than 10,000 ohms between C329-3 and ground? 

    Yes 

    GO to  O7.

    No 

    GO to O5.

  5. O5 CHECK CIRCUIT 1060 (BK/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Passenger Seat Cushion Heater C334.
    • Measure the resistance between passenger heated seat module C329-4, circuit 1060 (BK/LB), harness side and passenger seat cushion heater C334-2, circuit 1060 (BK/LB), harness side; and between passenger heated seat module C329-4, circuit 1060 (BK/LB), harness side and ground.
      Fig 5: Checking Circuit 1060 (BK/LB) For An Open Or Short To Ground
      G03246874Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C329-4 and C334-2, and greater than 10,000 ohms between C329-4 and ground? 

    Yes 

    GO to O6.

    No 

    REPAIR circuit 1060 (BK/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303. CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  6. O6 CHECK CIRCUIT 1061 (BR/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between passenger heated seat module C329-3, circuit 1061 (BR/LB), harness side and driver seat cushion heater C334-3, circuit 1061 (BR/LB), harness side; and between passenger heated seat module C329-3, circuit 1061 (BR/LB), harness side and ground.
      Fig 6: Checking Circuit 1061 (BR/LB) For An Open Or Short To Ground
      G03246875Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C329-3 and C334-3, and greater than 10,000 ohms between C329-3 and ground? 

    Yes 

    INSTALL a new passenger seat cushion heater. TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303. CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

    No 

    REPAIR circuit 1061 (BR/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  7. O7 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and ground; and between C329-7, circuit 1067 (VT/LB), harness side and ground.
      Fig 7: Checking The Seat Cushion Heater And The Seat Back Heater For A Short To Voltage
      G03246876Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 

    Yes 

    REPAIR circuit 1064 (YE/LB), circuit 1067 (VT/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

    No 

    GO to O8.

  8. O8 CHECK THE SEAT CUSHION HEATER AND SEAT BACK HEATER CIRCUITS 
    • Key in OFF position.
    • Measure the resistance between passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and C329-7, circuit 1067 (VT/LB), harness side; and between passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and ground
      Fig 8: Checking The Seat Cushion Heater And Seat Back Heater Circuits
      G03246877Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1.6 ohms and less than 10 ohms between C329-6 and C329-7 and greater than 10,000 ohms between C329-6 and ground? 

    Yes 

    GO to  O12.

    No 

    GO to O9.

  9. O9 CHECK CIRCUIT 1064 (YE/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Passenger Seat Cushion Heater C334.
    • Measure the resistance between passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and passenger seat cushion heater C334-1, circuit 1064 (YE/LB), harness side; and between the passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and ground.
      Fig 9: Checking Circuit 1064 (YE/LB) For An Open Or Short To Ground
      G03246878Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C329-6 and C334-1, and greater than 10,000 ohms between C329-6 and ground? 

    Yes 

    GO to O1.

    No 

    REPAIR circuit 1064 (YE/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  10. O10 CHECK CIRCUIT 1067 (VT/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between passenger heated seat module C329-7, circuit 1067 (VT/LB), harness side and passenger seat backrest heater C334-4, circuit 1067 (VT/LB), harness side; and between passenger heated seat module C329-7, circuit 1067 (VT/LB), harness side and ground.
      Fig 10: Checking Circuit 1067 (VT/LB) For An Open Or Short To Ground
      G03246879Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C329-7 and C334-1, and greater than 10,000 ohms between C329-7 and ground? 

    Yes 

    GO to O11.

    No 

    REPAIR circuit 1067 (VT/LB). TEST the system for normal operation.

    DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  11. O11 CHECK THE PASSENGER SEAT BACKREST HEATER 
    • Disconnect: Passenger Seat Backrest Heater 2-Pin Connector.
    • Measure the resistance between passenger seat backrest heater connector-1, component side and connector-2, component side.
      Fig 11: Checking The Passenger Seat Backrest Heater
      G03246880Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 1.2 ohms? 

    Yes 

    INSTALL a new passenger seat cushion heater. TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

    No 

    INSTALL a new passenger seat backrest heater. TEST the system for normal operation.

    DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  12. O12 CHECK CIRCUIT 1256 (WH/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: DATC Module C228b.
    • Key in ON position.
    • Measure the voltage between passenger heated seat module C329-8, circuit 1256 (WH/YE), harness side and ground.
      Fig 12: Checking Circuit 1256 (WH/YE) For A Short To Voltage
      G03246881Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.2 volt? 

    Yes 

    GO to O13.

    No 

    REPAIR circuit 1256 (WH/YE). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

  13. O13 CHECK CIRCUIT 1256 (WH/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between passenger heated seat module C329-8, circuit 1256 (WH/YE), harness side and ground.
      Fig 13: Checking Circuit 1256 (WH/YE) For A Short To Ground
      G03246882Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes 

    GO to O14.

    No 

    REPAIR circuit 1256 (WH/YE). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

  14. O14 CHECK CIRCUIT 1256 (WH/YE) FOR AN OPEN 
    • Measure the resistance between passenger heated seat module C329-8, circuit 1256 (WH/YE), harness side and DATC module C228b-15, circuit 1256 (WH/YE), harness side.
      Fig 14: Checking Circuit 1256 (WH/YE) For An Open
      G03246883Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to O15.

    No 

    REPAIR circuit 1256 (WH/YE). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  15. O15 CHECK THE HEATED SEAT MODULE 
    • Connect: Passenger Heated Seat Module C329.
    • Key in ON position.
    • Measure the voltage between DATC module C228b-16, circuit 580 (BR), harness side and ground; and between DATC module C228b-17, circuit 579 (BK/OG), harness side and ground.
      Fig 15: Checking The Heated Seat Module
      G03246884Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 

    Yes 

    GO to  O17.

    No 

    GO to O16.

  16. O16 CHECK CIRCUITS 579 (BK/OG) AND 580 (BR) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Passenger Heated Seat Module C329.
    • Key in ON position.
    • Measure the voltage between DATC module C228b-16, circuit 580 (BR), harness side and ground; and between DATC module C228b-17, circuit 579 (BK/OG), harness side and ground.
      Fig 16: Checking Circuits 579 (BK/OG) And 580 (BR) For A Short To Voltage
      G03246885Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 

    Yes 

    INSTALL a new heated seat module. TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

    No 

    REPAIR the affected circuits. TEST the system for normal operation.

    DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  17. O17 CHECK CIRCUITS 579 (BK/OG) AND 580 (BR) FOR A SHORT 
    • Key in OFF position.
    • Measure the resistance between DATC module C228b-16, circuit 580 (BR), harness side and C228b-17, circuit 579 (BK/OG), harness side.
      Fig 17: Checking Circuits 579 (BK/OG) And 580 (BR) For A Short
      G03246886Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes 

    GO to O18.

    No 

    REPAIR circuits 579 (BK/OG) and 580 (BR). TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

  18. O18 CHECK THE DATC MODULE OUTPUT 
    • Connect: DATC Module C228b.
    • Connect: Passenger Heated Seat Module C329.
    • Key in ON position.
      • NOTE: The voltage on circuit 1256 (WH/YE) should drop momentarily when the driver heated seat control button is pressed.
    • Measure the voltage between driver heated seat module C329-8, circuit 1256 (WH/YE), harness side and ground by back-probing the driver heated seat module C329-8. Press the passenger heated seat control button on the DATC module and note the voltage.
    • Is the voltage greater than 10 volts when the passenger heated seat control button is not pressed then momentarily drop when the heated seat control button is pressed? 

    Yes 

    INSTALL a new passenger heated seat module. TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

    No 

    If the voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new DATC module. Refer to CLIMATE CONTROL SYSTEM . TEST the system for normal operation.

    DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS).

    Refer to AIR BAG RESTRAINT SYSTEMS .

    CLEAR the DTCs. REPEAT the self test.

    If the voltage is less than 10 volts, INSTALL a new driver heated seat module.

    TEST the system for normal operation.

    DISCONNECT the battery ground cable.

    DISCONNECT the restraint system diagnostic tool from the passenger safety belt buckle pretensioner C303.

    CONNECT passenger safety belt buckle pretensioner C303.

    For vehicles with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C337.

    CONNECT passenger seat side air bag C337.

    ACTIVATE the supplemental restraint system (SRS). Refer to AIR BAG RESTRAINT SYSTEMS .

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