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Pinpoint Test O: The Heated Seat Is Inoperative - Front Passenger

WARNING: This page is about a different car, the 2012 Ford Pickup. 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 .
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. O1 CHECK HEATED SEAT OPERATION 
    • Start the engine.
    • Verify the driver heated seat is operational.
    • Is the driver heated seat operational? 
      1. Yes  : If equipped with navigation, GO to O2.

        If not equipped with navigation, GO to  O4.

      2. No  : GO to PINPOINT TEST M .
  2. O2 CHECK FOR FCIM DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
    • Retrieve and record all FCIM DTCs.
    • Are any DTCs retrieved? 
      1. Yes  : REFER to the DTC Chart in INFORMATION AND ENTERTAINMENT SYSTEMS .
      2. No  : GO to O3.
  3. O3 MONITOR FCIM PASSENGER HEATED SEAT (CC_SW_P_HSEATS) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - FCIM.
    • Monitor the FCIM CC_SW_P_HSEATS PID while pressing the passenger heated seat button.
    • Does the PID status agree with the button setting? 
      1. Yes  : GO to O4.
      2. No  : INSTALL a new FCIM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
  4. O4 CHECK FOR HVAC MODULE DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - HVAC module.
    • Retrieve and record all HVAC DTCs.
    • Are any HVAC module DTCs retrieved? 
      1. Yes  : If DTC B1032:12, GO to  O19.

        If DTC B1032:13, GO to  O20.

        If DTC B1032:11, GO to  O21.

        For all other HVAC module DTCs, REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .

      2. No  : If equipped with navigation, GO to O5.

        If not equipped with navigation, GO to  O6.

  5. O5 CHECK THE OTHER HVAC FUNCTIONS 
    NOTE: The purpose of this step is to verify the HVAC module is able to receive and process inbound command messages from the communication bus and demonstrate the HVAC module is operational.
  6. O6 MONITOR HVAC MODULE RIGHT SEAT HEATER (ST_HEAT_RT) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - HVAC module.
      • NOTE: The PID data will quickly flicker on and off. Watch closely when pressing the switch button.
    • Monitor HVAC module ST_HEAT_RT PID while pressing passenger heated seat button.
    • Does the PID status agree with the button setting? 
      1. Yes  : GO to O7.
      2. No  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
  7. O7 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Ignition OFF.
    • Depower the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger Seat Side Air Bag Module C339.
    • Disconnect: Heated Seat Module C359B.
      • 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 AND CABLES .
    • Measure the voltage between heated seat module C359B-3, circuit CBX01 (GN/RD), harness side and ground.
      Fig 1: Measuring Voltage Between Heated Seat Module C359B-3, Circuit CBX01 (GN/RD), Harness Side And Ground
      G06063318Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      1. Yes  : GO to O8.
      2. No  : VERIFY Battery Junction Box (BJB) fuse 69 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams Information to identify the possible causes of the circuit short. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  8. O8 CHECK RESISTANCE OF THE PASSENGER SEAT HEATER MATS AND HEATER CIRCUITS 
    • Measure the resistance between heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and ground.
      Fig 2: Measuring Resistance Between Heated Seat Module C359B-6, Circuit CHS07 (GY/BU), Harness Side And Ground
      G06063274Courtesy of FORD MOTOR CO.
    • Is the resistance between 2 and 4 ohms? 
      1. Yes  : GO to  O14.
      2. No  : GO to O9.
  9. O9 CHECK THE PASSENGER SEAT CUSHION HEATER CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Passenger Seat Cushion Heater Mat C334.
    • Measure the resistance between:
      • heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and passenger seat cushion heater mat C334-1, circuit CHS07 (GY/BU), harness side.
      • heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and ground.
        Fig 3: Measuring Resistance Between Heated Seat Module C359B-6, Circuit CHS07 (GY/BU) And Passenger Seat Cushion Heater Mat C334-1, Circuit CHS07 (GY/BU)
        G06063275Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohms between C359B-6 and C334-1 and greater than 10, 000 ohms between C359B-6 and ground? 
      1. Yes  : GO to O10.
      2. No  : REPAIR the circuit. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  10. O10 CHECK THE CUSHION HEATER MAT FOR AN OPEN 
    • Measure the resistance between passenger seat cushion heater mat C334 pins 1 and 4, component side.
      Fig 4: Measuring Resistance Between Passenger Seat Cushion Heater Mat C334 Pins 1 And 4, Component Side
      G06063262Courtesy of FORD MOTOR CO.
    • Is the resistance between 1.6 and 2.0 ohms? 
      1. Yes  : GO to O11.
      2. No  : INSTALL a new passenger seat cushion heater mat. REFER to SEAT CUSHION HEATER MAT - FRONT  . TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  11. O11 CHECK FOR AN OPEN BETWEEN THE CUSHION AND BACKREST HEATER MATS 
    • Disconnect: Passenger Seat Backrest Heater Mat C335.
    • Measure the resistance between seat cushion heater mat C334-4, circuit CHS01 (GY/VT), harness side and seat backrest heater mat C335-1, circuit CHS01 (GY/VT), harness side.
      Fig 5: Measuring Resistance Between Seat Cushion Heater Mat C334-4, Circuit CHS01 (GY/VT) And Seat Backrest Heater Mat C335-1, Circuit CHS01 (GY/VT)
      G06063263Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
      1. Yes  : GO to O12.
      2. No  : REPAIR the circuit. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  12. O12 CHECK THE BACKREST HEATER MAT FOR AN OPEN 
    • Measure the resistance between passenger seat backrest heater mat C335 pins 1 and 2, component side.
      Fig 6: Measuring Resistance Between Passenger Seat Backrest Heater Mat C335 Pins 1 And 2, Component Side
      G06063264Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 1.1 ohm? 
      1. Yes  : GO to O13.
      2. No  : INSTALL a new passenger seat backrest heater mat. REFER to SEAT BACKREST HEATER MAT - FRONT  . TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  13. O13 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between passenger seat backrest heater C335-2, circuit GD904 (BK/BU), harness side and ground.
      Fig 7: Measuring Resistance Between Passenger Seat Backrest Heater C335-2, Circuit GD904 (BK/BU), Harness Side And Ground
      G06173390Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohms? 
      1. Yes  : The fault is intermittent. CHECK the electrical connectors for corrosion, poor pin contact or pushed out pins, particularly the pins and terminals of electrical connectors that were disconnected. Do not install any new components at this time. Components should only be installed when directed to do so in the pinpoint test  . REPAIR any intermittent wiring, terminal or connector concerns found. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  14. O14 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: Heated Seat Module C359A.
    • Ignition ON.
    • Measure the voltage between heated seat module C359A-9, circuit VHS27 (VT), harness side and ground.
      Fig 8: Measuring Voltage Between Heated Seat Module C359A-9, Circuit VHS27 (VT), Harness Side And Ground
      G06173409Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      1. Yes  : REPAIR the circuit. GO to  O18 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 HEATER MAT - FRONT  . TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      2. No  : GO to O15.
  15. O15 CHECK THE TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between heated seat module C359A-9, circuit VHS27 (WH/OG), and C359A-12, circuit RHS05 (YE-VT), harness side.
      Fig 9: Measuring Resistance Between Heated Seat Module C359A-9, Circuit VHS27 (WH/OG), And C359A-12, Circuit RHS05 (YE-VT), Harness Side
      G06173408Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 and 300K ohms? 
      1. Yes  : GO to  O19.
      2. No  : GO to O16.
  16. O16 CHECK TEMPERATURE SENSOR CIRCUIT FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Passenger Seat Cushion Heater Mat C334.
    • Measure the resistance between:
      • heated seat module C359A-9, circuit VHS27 (WH/OG), harness side and seat cushion heater mat C334-2, circuit VHS27 (WH/OG), harness side.
      • heated seat module C359A-9, circuit VHS27 (WH/OG), harness side and ground.
        Fig 10: Measuring Resistance Between Heated Seat Module C359A-9, Circuit VHS27 (WH/OG) And Seat Cushion Heater Mat C334-2, Circuit VHS27 (WH/OG)
        G06063271Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between C359A-9 and C334-2, and greater than 10, 000 ohms between C359A-9 and ground? 
      1. Yes  : GO to O17.
      2. No  : REPAIR the circuit. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  17. O17 CHECK TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Measure the resistance between heated seat module C359A-12, circuit RHS05 (YE/VT), harness side and passenger seat cushion heater mat C334-3, circuit RHS05 (YE/VT), harness side.
      Fig 11: Measuring Resistance Between Heated Seat Module C359A-12, Circuit RHS05 (YE/VT) And Passenger Seat Cushion Heater Mat C334-3, Circuit RHS05 (YE/VT)
      G06173394Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      1. Yes  : GO to O18.
      2. No  : REPAIR the circuit. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  18. O18 CHECK HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN 
    • Measure the resistance between heated seat cushion C334 pins 2 and 3, component side.
      Fig 12: Measuring Resistance Between Heated Seat Cushion C334 Pins 2 And 3, Component Side
      G06063259Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 ohms and 300K ohms? 
      1. Yes  : GO to O19.
      2. No  : INSTALL a new seat cushion heater mat. REFER to SEAT CUSHION HEATER MAT - FRONT  . TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  19. O19 CHECK THE HEATED SEAT MODULE SWITCH REQUEST CIRCUIT FOR A SHORT TO VOLTAGE 
    • If heated seat module C359A has not been previously disconnected, carry out the following steps:
      • Ignition OFF.
      • Depower the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
      • Disconnect: Driver Seat Side Air Bag Module C3051.
      • Disconnect: Passenger Seat Side Air Bag Module C339.
      • Disconnect: Heated Seat Module C359A.
        • 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 AND CABLES .
    • Disconnect: HVAC Module C2109A (without navigation) or C228B (with navigation).
    • Ignition ON.
    • Measure the voltage between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and ground.
      Fig 13: Measuring Voltage Between Heated Seat Module C359A-8, Circuit CHS30 (GY/YE), Harness Side And Ground
      G06063279Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      1. Yes  : REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      2. No  : GO to O20.
  20. O20 CHECK THE HEATED SEAT MODULE SWITCH REQUEST CIRCUIT FOR AN OPEN 
    • If heated seat module C359A has not been previously disconnected, carry out the following steps:
      • Ignition OFF.
      • Depower the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
      • Disconnect: Driver Seat Side Air Bag Module C3051
      • Disconnect: Passenger Seat Side Air Bag Module C339
      • Disconnect: Heated Seat Module C359A
        • 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 AND CABLES .
    • Disconnect: HVAC Module C2109A (without navigation) or C228B (with navigation) (if not previously disconnected).
    • Ignition OFF.
    • For vehicles with navigation  , measure the resistance between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and HVAC module C228A-4, circuit CHS30 (GY/YE), harness side.
      Fig 14: Measuring Resistance Between Heated Seat Module C359A-8, Circuit CHS30 (GY/YE) And HVAC Module C228A-4, Circuit CHS30 (GY/YE)
      G06063281Courtesy of FORD MOTOR CO.
    • For vehicles without navigation  , measure the resistance between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and HVAC module C2109A-17, circuit CHS30 (GY), harness side.
      Fig 15: Measuring Resistance Between Heated Seat Module C359A-8, Circuit CHS30 (GY/YE) And HVAC Module C2109A-17, Circuit CHS30 (GY)
      G06458561Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      1. Yes  : GO to O21.
      2. No  : REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  21. O21 CHECK THE HEATED SEAT MODULE SWITCH REQUEST CIRCUIT FOR A SHORT TO GROUND 
    • If heated seat module C359A has not been previously disconnected, carry out the following steps:
      • Ignition OFF.
      • Depower the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
      • Disconnect: Driver Seat Side Air Bag Module C3051.
      • Disconnect: Passenger Seat Side Air Bag Module C339.
      • Disconnect: Heated Seat Module C359A.
        • 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 AND CABLES .
      • Disconnect: HVAC Module C2109A (without navigation) or C228B (with navigation) (if not previously disconnected).
      • Measure the resistance between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and ground.
        Fig 16: Measuring Resistance Between Heated Seat Module C359A-8, Circuit CHS30 (GY/YE), Harness Side And Ground
        G06063280Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      1. Yes  : GO to O22.
      2. No  : REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  22. O22 CHECK THE HVAC MODULE OUTPUT 
    NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list . Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
    • Connect: HVAC Module C2109A (without navigation) or C228B (with navigation).
    • Connect: Heated Seat Module C359A and C359B.
    • Ignition ON.
      • NOTE: The following measurement must be taken by back-probing heated seat module C359A.
      NOTE: Voltage on circuit CHS30 (GY/YE) should drop momentarily when the passenger heated seat button is pressed.
      Fig 17: Measuring And Record Voltage Between Heated Seat Module C359A-8, Circuit CHS30 (GY/YE) And Ground
      G07408296Courtesy of FORD MOTOR CO.
    • Measure and record the voltage between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and ground by backprobing heated seat module connector.
    • Measure and record the voltage as directed above while pressing the passenger heated seat button.
    • Is the voltage greater than 10 volts before pressing the passenger heated seat button, then momentarily drops when the heated seat button is pressed? 
      1. Yes  : INSTALL a new heated seat module. REFER to HEATED SEAT MODULE - FRONT  . TEST the system for normal operation.

        DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      2. No  : If the voltage is greater than 10 volts but does not drop when the passenger heated seat button is pressed, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation. If the voltage is less than 10 volts, INSTALL a new heated seat module. REFER to HEATED SEAT MODULE - FRONT  . TEST the system for normal operation.

        DISCONNECT the battery ground cable.

        CONNECT passenger seat side air bag module C339.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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