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Pinpoint Test N: The Heated Seat Is Inoperative - Driver

WARNING: This page is about a different car, the 2013 Ford F-150. 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 repaired, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
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. N1 CHECK FOR HVAC DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
    • Were any DTCs retrieved during the self-tests? 
    • Yes  : For DTCs B1034:11 or B1034:13, GO to  N3.

      For DTCs B1038:11 or B1038:12, GO to  N4.

      For all other DTCs, REFER to the HVAC Module DTC Chart .

    • No  : GO to N2.
  2. N2 CHECK THE TOUCHSCREEN CONTROLS OPERATION 
    • Start the engine.
    • Select each audio and climate control function using the touchscreen controls.
    • Do all touchscreen controls operate? 
  3. N3 CHECK THE HEATER ELEMENT POWER CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag Module C3051.
    • Disconnect: HVAC Module C228B.
    • Disconnect: Driver Cushion Heater Mat C364.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag 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, BATTERY MOUNTING & BATTERY CABLES .
    • Measure the resistance between:
      • driver seat cushion heater mat C364-1, circuit CHS02 (YE/BU), harness side and ground.
      • driver seat cushion heater mat C364-1, circuit CHS02 (YE/BU), harness side and HVAC module C228B-16, circuit CHS02 (YE/BU), harness side.
        Fig 1: Checking Heater Element Power Circuit For Open Or Short To Ground
        G07402879Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the HVAC module? 
  4. N4 CHECK RESISTANCE OF THE DRIVER SEAT HEATER MATS AND HEATER CIRCUITS 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag Module C3051.
    • Disconnect: HVAC Module C228B.
    • Disconnect: Driver Cushion Heater Mat C364.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag 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, BATTERY MOUNTING & BATTERY CABLES .
    • Measure the resistance between:
      • driver seat cushion heater mat C364-2, circuit VHS26 (VT), harness side and ground.
      • driver seat cushion heater mat C364-2, circuit VHS26 (VT), harness side and HVAC module C228B-30, circuit VHS26 (VT), harness side.
        Fig 2: Checking Resistance Of Driver Seat Heater Mats And Heater Circuits
        G07402880Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the HVAC module? 
  5. N5 CHECK THE HEATED SEAT TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: HVAC Module C228A.
    • Measure the resistance between:
      • driver seat cushion heater mat C364-3, circuit RHS05 (YE/VT), harness side and ground.
      • driver seat cushion heater mat C364-3, circuit RHS05 (YE/VT), harness side and HVAC module C228A-23, circuit RH111 (GY/BU), harness side.
        Fig 3: Checking Heated Seat Temperature Sensor Return Circuit For Open Or Short To Ground
        G08343731Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the HVAC module? 
  6. N6 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between driver seat cushion heater mat C364-2, circuit VHS26 (VT), harness side and ground.
      Fig 4: Checking Heated Seat Temperature Sensor Circuit For A Short To Voltage
      G08343732Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  7. N7 CHECK THE HEATER ELEMENT GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Driver Seat Backrest Heater Mat C365.
    • Measure the resistance between driver seat backrest heater mat C365-2, circuit GD904 (BK/BU), harness side and ground.
      Fig 5: Checking Heater Element Ground Circuit For An Open
      G06173390Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohms? 
  8. N8 CHECK CUSHION HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between driver seat cushion heater mat C364 pins 1 and 4, component side; and between driver seat cushion heater mat C364 pin 1, component side and ground.
      Fig 6: Checking Cushion Heated Seat Mat For Open Or Short To Ground
      G08343734Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 ohms and 2 ohms between pins 1 and 4; and greater than 10, 000 ohms between pin 1 and ground? 
  9. N9 CHECK THE BACKREST HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between driver seat backrest heater mat C365 pins 1 and 2, component side; and between driver seat backrest heater mat C365 pin 2, component side and ground.
      Fig 7: Checking Backrest Heated Seat Mat For Open Or Short To Ground
      G08343735Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 1.1 ohms between pins 1 and 2: and greater than 10, 000 ohms between pin 2 and ground? 
  10. N10 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND 
    • Measure the resistance between:
      • seat cushion heater mat C364-4, circuit CHS01 (GY/VT), harness side and seat backrest heater mat C365-1, circuit CHS01 (GY/VT) harness side.
      • seat cushion heater mat C364-4, circuit CHS01 (GY/VT), harness side and ground.
        Fig 8: Checking Circuit Between Cushion Heater Mat And Backrest Heater Mat For Open And Short To Ground
        G06255405Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms between C364-4 and C365-1; and greater than 10, 000 ohms between C364-4 and ground? 
  11. N11 CHECK THE HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN OR SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between heated seat cushion C364 pins 2 and 3, component side; and between heated seat cushion C364 pin 2, component side and ground.
      Fig 9: Checking Heated Seat Temperature Sensor For Open Or Short To Ground
      G08343737Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 ohms and 300K ohms between pins 2 and 3; and greater than 10, 000 ohms between pin 2 and ground? 
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