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Pinpoint Test A : Both Heated Rear Seats Are Inoperative

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  1. A1 CHECK FOR VOLTAGE TO THE HEATED REAR SEAT MODULE

    • Ignition OFF.

    • Disconnect Heated Rear Seat Module C3304B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3304B-1
      GFD410919Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A2
    No  VERIFY BJB fuse 83 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Wiring Diagrams to identify the possible causes of the circuit short.

  2. A2 CHECK FOR IGNITION VOLTAGE TO THE HEATED REAR SEAT MODULE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3304B-2
      GFD410919Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A3
    No  VERIFY BCM fuse 36 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Wiring Diagrams to identify the possible causes of the circuit short.

  3. A3 CHECK THE HEATED REAR SEAT MODULE GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3304B-5
      GFD410920Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  A4
    No  REPAIR the circuit.

  4. A4 VERIFY THE HEATED REAR SEAT SWITCH IS PROVIDING A GROUND INPUT SIGNAL TO THE HEATED SEAT MODULE

    • Disconnect Heated Rear Seat Module C3304A.

    • While pressing and releasing the left heated rear seat switch, measure:
      Positive Lead Measurement / Action Negative Lead
      C3304A-2
      GFD410920Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms when the switch is pressed and greater than 10, 000 ohms when released? 

    Yes  GO to  A6
    No  GO to  A5

  5. A5 CHECK THE HEATED REAR SEAT SWITCH GROUND CIRCUIT FOR AN OPEN

    • Disconnect Heated Rear Seat Switch C3182.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3182-8
      GFD410920Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch - Crew Cab .
    No  REPAIR the circuit.

  6. A6 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3304A-3
      GFD410920Courtesy of FORD MOTOR COMPANY
      		 C3304A-12

    Is the resistance between 300 and 300K ohms? 

    Yes  INSTALL a new heated rear seat module. REFER to: Heated Rear Seat Module - Crew Cab  .
    No  REPAIR the circuit.
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