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Pinpoint Test R: The Heated Seat Is Inoperative - Driver

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. R1 CHECK HEATED SEAT OPERATION 
    • Start the engine.
    • Verify the passenger heated seat is operational.
    • Is the passenger heated seat operational? 
    1. Yes  : GO to R2  .
    2. No  : GO to SYMPTOM TABLE  to diagnose the heated seats are inoperative - driver and front passenger or the heated seat is inoperative/does not operate correctly - passenger.
  2. R2 CHECK HEATED SEAT INDICATOR ILLUMINATION 
    • Verify system indicator illumination.
    • Do the driver heated seat indicators illuminate or flash and then turn off? 
    1. Yes  : GO to  R7.
    2. No  : Vehicles with navigation, GO to R3  .

      Vehicles without navigation, GO to  R4.

  3. R3 RETRIEVE THE FCIM DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
    • Are any FCIM DTCs retrieved? 
    1. Yes  : For all FCIM DTCs, REFER to the Master DTC Table in INFORMATION & ENTERTAINMENT SYSTEMS -- FUSION, MILAN & MKZ article.
    2. No  : GO to R4  .
  4. R4 RETRIEVE THE HVAC MODULE DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
    • Are any HVAC module DTCs retrieved? 
    1. Yes  : If DTC B1030:12, GO to  R18.

      If DTC B1030:14, GO to  R19.

      For any other HVAC module DTCs, REFER to the HVAC MODULE DTC TABLE  in this service information.

    2. No  : For vehicles with navigation, GO to R5  .

      For vehicles without navigation, GO to  R6.

  5. R5 MONITOR THE DRIVER HEATED SEAT (CC_SW_D_HSEATS) PID AND CHECK INPUTS 
    • Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs: CC_SW_D_HSEATS.
    • Monitor the FCIM PID while pushing the driver heated seat button.
    • Do the PID states agree with the switch button positions? 
    1. Yes  : GO to R6  .
    2. No  : INSTALL a new FCIM. REFER to INFORMATION & ENTERTAINMENT SYSTEMS -- FUSION, MILAN & MKZ article.

      TEST the system for normal operation.

  6. R6 MONITOR THE DRIVER HEATED SEAT (CC_SW_D_HSEATS) PID AND CHECK INPUTS 
    • Enter the following diagnostic mode on the scan tool: DataLogger - HVAC Module - PIDs: CC_SW_D_HSEATS.
    • Monitor the HVAC module PID while pushing the driver heated seat button.
    • Do the PID values agree with the switch button positions? 
    1. Yes  : The fault is intermittent, CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion, poor pin contact or pushed-out pins. REPAIR any intermittent concerns found and TIGHTEN any loose connector pins.

      REPEAT the self-test. CLEAR the DTCs. CHECK the system for normal operation.

    2. No  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ . TEST the system for normal operation.
  7. R7 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Driver Seat Side Air Bag Module C327.
    • Disconnect: Passenger Seat Side Air Bag Module C313.
    • Disconnect: Heated Seat Module C3304B.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
    • Measure the voltage between heated seat module C3304B-1, circuit SBP18 (YE/RD) harness side and ground.
      Fig 1: Checking Voltage To Heated Seat Module
      G07788733Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to R8  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  8. R8 CHECK THE TEMPERATURE SENSOR OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: Heated Seat Module C3304A.
    • Disconnect: Driver Seat Cushion Heater Mat C364.
    • Ignition ON.
    • Measure the voltage between heated seat module C3304A-3, circuit VHS26 (VT), harness side and ground.
      Fig 2: Checking Temperature Sensor Output Circuit For Short To Voltage
      G07788734Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. GO to  R11 to check the temperature sensor for damage. If OK, TEST the system for normal operation. If not OK, INSTALL a new driver seat cushion heater mat. REFER to SEAT CUSHION COVER - FRONT  in this service information. DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
    2. No  : GO to R9  .
  9. R9 CHECK THE TEMPERATURE SENSOR OUTPUT CIRCUIT FOR AN OPEN AND SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • heated seat module C3304A-3, circuit VHS26 (VT), harness side and rear seat cushion heater mat C364-3, circuit VHS26 (VT), harness side.
      • heated seat module C3304A-3, circuit VHS26 (VT), harness side and ground.
      Fig 3: Checking Temperature Sensor Output Circuit For Open And Short To Ground
      G07788735Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C3304A-3 and C364-3, and greater than 10,000 ohms between C3304A-3 and ground? 
    1. Yes  : GO to R10  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  10. R10 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Measure the resistance between heated seat module C3304A-12, circuit RHS05 (YE/VT), harness side and driver seat cushion heater mat C364-4, circuit RHS05 (YE/VT), harness side.
      Fig 4: Checking Temperature Sensor Return Circuit For Open
      G07788736Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to R11  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  11. R11 CHECK THE TEMPERATURE SENSOR FOR AN OPEN 
    • Measure the resistance between rear heated seat cushion C364 pin 3 and pin 4, component side.
      Fig 5: Measuring Resistance Between Rear Heated Seat Cushion C364 Pin 3 And Pin 4, Component Side
      G07788737Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 ohms and 300,000 ohms? 
    1. Yes  : GO to R12  .
    2. No  : INSTALL a new cushion heater mat. REFER to SEAT CUSHION COVER - FRONT  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  12. R12 CHECK THE HEATER MAT OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and ground.
      Fig 6: Measuring Voltage Between Heated Seat Module C3304B-4, Circuit CHS02 (YE/BU), Harness Side And Ground
      G07788738Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT 501-10-73 Seating 501-10-73 passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No 

      GO to R13  .

  13. R13 CHECK THE HEATER MAT OUTPUT CIRCUIT FOR AN OPEN AND SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and cushion heater mat C364-1, circuit CHS02 (YE/BU), harness side.
      • heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and ground.
      Fig 7: Checking Heater Mat Output Circuit For Open And Short To Ground
      G07788739Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C3304B-4 and C364-1, and greater than 10,000 ohms between C3304B-4 and ground? 
    1. Yes  : GO to R14  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  14. R14 CHECK THE HEATER MAT RESISTANCE 
    • Connect: Driver Seat Backrest Heater Mat C365.
    • Connect: Driver Seat Cushion Heater Mat C364.
    • Measure the resistance between heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and ground.
      Fig 8: Measuring Resistance Between Heated Seat Module C3304B-4, Circuit CHS02 (YE/BU), Harness Side And Ground
      G07788740Courtesy of FORD MOTOR CO.
    • Is the resistance between 1.2 and 4.0 ohms? 
    1. Yes  : GO to  R21.
    2. No  : GO to R15  .
  15. R15 CHECK THE CUSHION HEATER MAT FOR AN OPEN 
    • Disconnect: Driver Seat Cushion Heater Mat C364.
    • Measure the resistance between driver seat cushion heater mat C364 pins 1 and 2, component side.
      Fig 9: Measuring Resistance Between Driver Seat Cushion Heater Mat C364 Pins 1 And 2, Component Side
      G07788741Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 2.0 ohms? 
    1. Yes  : GO to R16  .
    2. No  : INSTALL a new driver seat cushion heater mat. REFER to SEAT CUSHION COVER - FRONT  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  16. R16 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Driver Seat Backrest Heater Mat C365.
    • Measure the resistance between:
      • seat cushion heater mat C364-2, circuit CHS11 (VT/GN), harness side and seat backrest heater mat C365-1, circuit CHS11 (VT/GN), harness side.
      • seat cushion heater mat C364-2, circuit CHS11 (VT/GN), harness side and ground.
      Fig 10: Checking Circuit Between Cushion Heater Mat And Backrest Heater Mat For Open And Short To Ground
      G07788742Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. Yes  : GO to R17  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  17. R17 CHECK THE BACKREST HEATER MAT FOR AN OPEN 
    • Measure the resistance between driver seat backrest heater mat C365 pins 1 and 2, component side.
      Fig 11: Measuring Resistance Between Driver Seat Backrest Heater Mat C365 Pins 1 And 2, Component Side
      G07788743Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 2.0 ohms? 
    1. Yes  : REPAIR circuit GD126 (BK/WH) for an open. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new driver seat backrest heater mat. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  18. R18 CHECK HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Side Air Bag Module C313.
    • Disconnect: Heated Seat Module C3304A.
    • Disconnect: HVAC Module C2356A.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
    • Ignition ON.
    • Measure the voltage between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and ground.
      Fig 12: Measuring Voltage Between Heated Seat Module C3304A-2, Circuit CHS29 (WH/BU), Harness Side And Ground
      G07788744Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. TEST the system for normal operation. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
  19. R19 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Passenger Seat Side Air Bag Module C313.
    • Disconnect: Heated Seat Module C3304A.
    • Disconnect: HVAC Module C2356A.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
    • Measure the resistance between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and HVAC module C2356A-5, circuit CHS29 (WH/BU), harness side.
      Fig 13: Checking Heated Seat Module Switch Input Circuit For Open
      G07788745Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to R20  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  20. R20 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and ground.
      Fig 14: Measuring Resistance Between Heated Seat Module C3304A-2, Circuit CHS29 (WH/BU), Harness Side And Ground
      G07788746Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : INSTALL a new heated seat module. REFER to HEATED SEAT MODULE  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  21. R21 CHECK THE HVAC MODULE OUTPUT 
    • Connect: Heated Seat Module C3304A and C3304B.
    • Ignition ON.
      • NOTE: The following measurement must be taken by back-probing heated seat module C3304A.
      NOTE: Voltage on circuit CHS29 (WH/BU) should drop momentarily when the driver heated seat control button is pressed.
      Fig 15: Measuring Voltage Between Heated Seat Module C3304A-2, Circuit CHS29 (WH/BU), Harness Side And Ground
      G07788747Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and ground by back-probing heated seat module connector. Press the driver heated seat button on the HVAC module and note the voltage.
    • Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed? 
    1. Yes  : INSTALL a new heated seat module. REFER to HEATED SEAT MODULE  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : If voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new HVAC module. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ . TEST the system for normal operation.

      If voltage is less than 10 volts, INSTALL a new heated seat module. REFER to HEATED SEAT MODULE  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

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