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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seat System - Seats >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test P: The Heated Seat is Inoperative - Right Rear >> Pinpoint Test P: The Heated Seat Is Inoperative - Right Rear

Pinpoint Test P: The Heated Seat Is Inoperative - Right Rear

  1. P1 CHECK HEATED SEAT OPERATION 
    • Ignition ON.
    • Operate the right rear heated seat in the HIGH and LOW setting.
    • Does the seat operate in either setting? 
    • Yes  : If only the low setting operates, GO to  P14.

      If only the high setting operates, GO to  P15.

    • No  : GO to P2.
  2. P2 CHECK HEATED SEAT SWITCH INPUT 
    • Ignition OFF.
    • Disconnect: Rear Heated Seat Module C3304A.
    • Measure the resistance between rear heated seat module C3304A-8, circuit CHS50 (BU/GY), harness side and ground while pressing the high heated seat switch.
      Fig 1: Measuring Resistance Between Rear Heated Seat Module C3304A-8, Circuit CHS50 (BU/GY) And Ground While Pressing High Heated Seat Switch
      G07819576Courtesy of FORD MOTOR CO.
    • Is the resistance less than 30 ohms when the heated seat switch is pressed and greater than 10, 000 ohms when the heated seat switch is released? 
    • Yes  : GO to  P4.
    • No  : GO to P3.
  3. P3 CHECK HEATED SEAT SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Rear Heated Seat Switch C321.
    • Measure the resistance between right rear heated seat switch C321-1, circuit GD114 (BK/BU), harness side and ground.
      Fig 2: Measuring Resistance Between Right Rear Heated Seat Switch C321-1, Circuit GD114 (BK/BU), Harness Side And Ground
      G07819577Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  P17.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. P4 CHECK THE VOLTAGE TO THE REAR HEATED SEAT MODULE 
    • Disconnect: Rear Heated Seat Module C3304B.
    • Measure the voltage between rear heated seat module C3304B-3, circuit SBP18 (YE/RD), harness side and ground.
      Fig 3: Measuring Voltage Between Rear Heated Seat Module C3304B-3, Circuit SBP18 (YE/RD), Harness Side And Ground
      G07819578Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to P5.
    • No  : REPAIR the affected circuit. TEST the system for normal operation.
  5. P5 CHECK THE PASSENGER HEATER MATS RESISTANCE AND HEATER MAT CIRCUITS FOR AN OPEN 
    • Measure the resistance between rear heated seat module C3304B-6, circuit CHS43 (GY/BU), harness side and ground.
      Fig 4: Measuring Resistance Between Rear Heated Seat Module C3304B-6, Circuit CHS43 (GY/BU), Harness Side And Ground
      G07819579Courtesy of FORD MOTOR CO.
    • Is the resistance between 1.2 and 4 ohms? 
    • Yes  : GO to  P10.
    • No  : GO to P6.
  6. P6 CHECK HEATER GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Passenger Seat Backrest Heater Mat C3170.
    • Measure the resistance between passenger backrest heater mat C3170-1, circuit GD145 (BK/BU), harness side and ground.
      Fig 5: Measuring Resistance Between Passenger Backrest Heater Mat C3170-1, Circuit GD145 (BK/BU), Harness Side And Ground
      G07819580Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to P7.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  7. P7 CHECK REAR SEAT CUSHION CIRCUIT FOR AN OPEN AND A SHORT TO GROUND 
    • Disconnect: Rear Seat Cushion C3045.
    • Measure the resistance between:
      • rear heated seat module C3304B-6, circuit CHS43 (GY/BU), harness side and rear seat cushion heater mat C3045-5, circuit CHS43 (GY/BU), harness side.
      • rear heated seat module C3304B-6, circuit CHS43 (GY/BU), harness side and ground.
        Fig 6: Measuring Resistance Between Rear Heated Seat Module C3304B-6, Circuit CHS43 (GY/BU), Harness Side And Ground
        G07819581Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the rear heated seat module and the rear heated seat cushion and greater than 10, 000 ohms between the rear heated seat module and ground? 
    • Yes  : GO to P8.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  8. P8 CHECK THE PASSENGER CUSHION HEATER MAT FOR AN OPEN 
    • Measure the resistance between rear heated seat cushion C3045 pin 6 and pin 5, component side.
      Fig 7: Measuring Resistance Between Rear Heated Seat Cushion C3045 Pin 6 And Pin 5, Component Side
      G07819582Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 2 ohms? 
    • Yes  : GO to P9.
    • No  : INSTALL a new rear seat cushion heater mat. REFER to SEAT CUSHION HEATER MAT - REAR  . TEST the system for normal operation.
  9. P9 CHECK THE PASSENGER SEAT BACKREST HEATER MAT FOR AN OPEN 
    • Measure the resistance between right rear seat backrest heater C3170 pins 1 and 2, component side.
      Fig 8: Measuring Resistance Between Right Rear Seat Backrest Heater C3170 Pins 1 And 2, Component Side
      G07819583Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 2 ohms? 
    • Yes  : REPAIR circuit CHS12 (YE/GN) for an open. TEST the system for normal operation.
    • No  : INSTALL a new rear seat backrest heater mat. REFER to SEAT BACKREST HEATER MAT - REAR  . TEST the system for normal operation.
  10. P10 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between heated seat module C3304A-9, circuit VHS45 (GY/BN), harness side and ground.
      Fig 9: Measuring Voltage Between Heated Seat Module C3304A-9, Circuit VHS45 (GY/BN), Harness Side And Ground
      G07819584Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to P11.
  11. P11 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR AN OPEN AND SHORT TO GROUND 
    • Ignition OFF.
    • Connect: Rear Seat Cushion C3045.
    • Measure the resistance between:
      • heated seat module C3304A-9, circuit VHS45 (GY/BN), harness side and C3304A-12, circuit RHS41 (GN/BN), harness side.
      • heated seat module C3304A-9, circuit VHS45 (GY/BN), harness side and ground.
        Fig 10: Measuring Resistance Between Heated Seat Module C3304A-9, Circuit VHS45 (GY/BN), Harness Side And Ground
        G07819585Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 and 300, 000 ohms and greater than 10, 000 ohms between the heated seat module and ground? 
    • Yes  : GO to  P18
    • No  : GO to P12.
  12. P12 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT VHS45 (GY/BN) FOR AN OPEN AND A SHORT TO GROUND 
    • Disconnect: Rear Seat Cushion C3045.
    • Measure the resistance between:
      • rear heated seat module C3304A-9, circuit VHS45 (GY/BN), harness side and rear seat cushion heater mat C3045-7, circuit VHS45 (GY/BN), harness side.
      • rear heated seat module C3304A-9, circuit VHS45 (GY/BN), harness side and ground.
        Fig 11: Measuring Resistance Between Rear Heated Seat Module C3304A-9, Circuit VHS45 (GY/BN), Harness Side And Ground
        G07819586Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the rear heated seat module and the rear seat cushion heater mat and greater than 10, 000 ohms between the rear heated seat module and ground? 
    • Yes  : GO to P13.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  13. P13 CHECK THE TEMPERATURE SENSOR FOR AN OPEN 
    • Measure the resistance between rear heated seat cushion C3045 pin 7 and pin 8, component side.
      Fig 12: Measuring Resistance Between Rear Heated Seat Cushion C3045 Pin 7 And Pin 8, Component Side
      G07819587Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 ohms and 300, 000 ohms? 
    • Yes  : REPAIR circuit RHS41 (GN/BN). TEST the system for normal operation.
    • No  : INSTALL a new rear seat cushion heater mat. REFER to SEAT CUSHION HEATER MAT - REAR  . TEST the system for normal operation.
  14. P14 CHECK THE HEATED SEAT SWITCH HIGH CIRCUIT FOR AN OPEN AND A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: Rear Heated Seat Module C3304A.
    • Disconnect: Heated Seat Switch C321.
    • Measure the resistance between:
      • rear heated seat module C3304A-8, circuit CHS50 (BU/GY), harness side and right rear heated seat switch C321-6, circuit CHS50 (BU/GY), harness side.
      • rear heated seat module C3304A-8, circuit CHS50 (BU/GY), harness side and ground.
        Fig 13: Measuring Resistance Between Rear Heated Seat Module C3304A-8, Circuit CHS50 (BU/GY), Harness Side And Ground
        G07819588Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the heated seat module and the heated seat switch and greater than 10, 000 ohms between the heated seat module and ground? 
    • Yes  : GO to  P16.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  15. P15 CHECK THE HEATED SEAT SWITCH LOW CIRCUIT FOR AN OPEN AND A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: Rear Heated Seat Module C3304A.
    • Disconnect: Heated Seat Switch C321.
    • Measure the resistance between:
      • rear heated seat module C3304A-7, circuit CHS51 (YE/GY), harness side and right rear heated seat switch C321-2, circuit CHS51 (YE/GY), harness side.
      • rear heated seat module C3304A-7, circuit CHS51 (YE/GY), harness side and ground.
        Fig 14: Measuring Resistance Between Rear Heated Seat Module C3304A-7, Circuit CHS51 (YE/GY), Harness Side And Ground
        G07819589Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the heated seat module and the heated seat switch and greater than 10, 000 ohms between the heated seat module and ground? 
    • Yes  : GO to P16.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  16. P16 CHECK THE REAR HEATED SEAT SWITCH 
    • Measure the resistance between rear heated seat switch pins, component side, while pressing the indicated switch buttons and compare the results to the table.
      REAR HEATED SEAT SWITCH RESISTANCE REFERENCE TABLE

      Heated Seat Switch Pins Ohms
      High Heated Seat Switch 6 and 1 Less than 30 when pressed; greater than 10, 000 when released
      Low Heated Seat Switch 2 and 1 Less than 30 when pressed; greater than 10, 000 when released
    • Is the resistance less than 30 ohms with the switch buttons depressed and greater than 10, 000 ohms with the switch buttons released? 
  17. P17 CHECK HEATED SEAT SWITCH CIRCUIT FOR AN OPEN 
    NOTE: This step tests for an open circuit in the wiring harness interconnectors.
    • Measure the resistance between right rear heated seat switch C321-6, circuit CHS50 (BU/GY), harness side and Rear Heated Seat Module C3304A-8, circuit CHS50 (BU/GY), harness side.
      Fig 15: Measuring Resistance Between Right Rear Heated Seat Switch C321-6, Circuit CHS50 (BU/GY) And Rear Heated Seat Module C3304A-8, Circuit CHS50 (BU/GY)
      G07819591Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new rear heated seat switch. REFER to HEATED SEAT SWITCH - REAR  .
    • No  : REPAIR the circuit. TEST the system for normal operation.
  18. P18 CHECK FOR CORRECT REAR HEATED SEAT MODULE OPERATION 
    • Disconnect: Rear Heated Seat Module Connectors.
    • Check for:
      • corrosion
      • pushed-out pins
      • spread terminals
    • Connect: Rear Heated Seat Module Connectors.
    • Connect the rear heated seat module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new rear heated seat module module. REFER to HEATED SEAT MODULE - REAR  . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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