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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1720 (Seat System - Seats) >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test Q: The Heated Seats are Inoperative - Driver and Front Passenger >> Pinpoint Test Q: The Heated Seats Are Inoperative - Driver And Front Passenger

Pinpoint Test Q: The Heated Seats Are Inoperative - Driver And Front Passenger

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 .
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. Q1 CHECK HEATED SEAT OPERATION 
    • Ignition OFF.
    • Start the engine.
    • Verify both heated seats do not heat.
    • Does either heated seat operate? 
    1. Yes  : GO to SYMPTOM TABLE  to diagnose the heated seat is inoperative/does not operate correctly - driver or the heated seat is inoperative/does not operate correctly - passenger.
    2. No  : GO to Q2  .
  2. Q2 CHECK HEATED SEAT INDICATOR ILLUMINATION 
    • Ignition OFF.
    • Start the engine.
    • Verify system indicator illumination.
    • When pressing and releasing each heated seat button individually, does any heated seat indicator illuminate or flash and then turn off? 
    1. Yes  : GO to  Q7.
    2. No  : For vehicles with navigation, GO to Q3  .

      For vehicles without navigation, GO to  Q4.

  3. Q3 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 Q4  .
  4. Q4 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  : For any HVAC module DTCs, REFER to the HVAC MODULE DTC TABLE  in this service information.
    2. No  : For vehicles with navigation, GO to Q5  .

      For vehicles without navigation, GO to  Q6.

  5. Q5 MONITOR THE FCIM PIDs AND CHECK INPUTS 
    • Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs.
      • Driver Heated Seat (CC_SW_D_HSEATS)
      • Passenger Heated Seat (CC_SW_P_HSEATS)
    • Monitor the FCIM PIDs while individually pushing the driver and passenger heated seat buttons.
    • Do the PID values agree with the switch button positions? 
    1. Yes  : GO to Q6  .
    2. No  : INSTALL a new FCIM. REFER to INFORMATION & ENTERTAINMENT SYSTEMS -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
  6. Q6 MONITOR THE HVAC MODULE PIDs AND CHECK INPUTS 
    • Enter the following diagnostic mode on the scan tool: DataLogger - HVAC Module - PIDs.
      • Driver Heated Seat (CC_SW_D_HSEATS)
      • Passenger Heated Seat (CC_SW_P_HSEATS)
    • Monitor HVAC module PIDs while individually pushing the driver and passenger heated seat buttons.
    • 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 article. TEST the system for normal operation.
  7. Q7 CHECK VOLTAGE TO THE HEATED SEAT MODULE 
    • 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 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.
    • Ignition ON.
    • Measure the voltage between:
      • heated seat module C3304B-1, circuit SBP18 (YE/RD), harness side and ground.
      • heated seat module C3304B-2, circuit CBP35 (YE/GY), harness side and ground.
      Fig 1: Measuring Voltage Between Heated Seat Module Harness Side And Ground
      G07788730Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. Yes  : GO to Q8  .
    2. No  : VERIFY Smart Junction Box (SJB) fuses 18 (20A) and 35 (10A) are OK. If OK, REPAIR the affected circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article 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 C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  8. Q8 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between heated seat module C3304B-5, circuit GD139 (BK/YE), harness side and ground.
      Fig 2: Checking Heated Seat Module Ground Circuit For Open
      G07788731Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to Q9  .
    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.

  9. Q9 CHECK HEATED SEAT MODULE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Disconnect: Heated Seat Module C3304A.
    • Disconnect: Passenger Seat Cushion Heater C334.
    • Measure the resistance between heated seat module C3304A-12, circuit RHS05 (YE/VT), harness side and passenger seat cushion heater C334-4, circuit RHS05 (YE/VT), harness side.
      Fig 3: Checking Heated Seat Module Sensor Return Circuit For Open
      G07788732Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 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.

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