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Pinpoint Test R: The Heated Seat Is Inoperative - Passenger

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. R1 CHECK CIRCUIT SBB11 (BU/RD) FOR VOLTAGE TO THE HEATED SEAT MODULE 
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
    NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered.  Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    NOTE: The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Key in OFF position.
      • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
    • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect: Heated Seat Module C3304.
    • Measure the voltage between heated seat module C3304-1, circuit SBB11 (BU/RD) harness side and ground and C3304-17, circuit SBB11 (BU/RD) harness side and ground.
      Fig 1: Checking Circuit SBB11 (BU/RD) For Voltage To Heated Seat Module
      G04683316Courtesy of FORD MOTOR CO.
    • Is the voltages greater than 10 volts? 

    Yes  : GO to R2.

    No  : VERIFY battery junction box (BJB) fuse 11 (20A Fusion and Milan) (30A Zephyr) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. R2 CHECK CIRCUIT CBP19 (BN/WH) FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Key in ON position.
    • Measure the voltage between heated seat module C3304-2, circuit CBP19 (BN/WH), harness side and ground.
      Fig 2: Checking Circuit CBP19 (BN/WH) For Voltage To Heated Seat Module
      G04683317Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to R3.

    No  : VERIFY smart junction box (SJB) fuse 28 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. R3 CHECK HEATED SEAT MODULE GROUND CIRCUIT GD139 (BK/YE) 
    • Key in OFF position.
    • Measure the resistance between heated seat module C3304-7, circuit GD139 (BK/YE), harness side and ground.
      Fig 3: Checking Heated Seat Module Ground Circuit GD139 (BK/YE)
      G04683318Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to R4.

    No  : REPAIR circuit GD139 (BK/YE). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  4. R4 CHECK CIRCUIT CHS07 (GY/BU) FOR SHORT TO VOLTAGE 
    • Disconnect: Passenger Seat Cushion Heater C334/C3320.
    • Key in ON position.
    • For Zephyr, measure the voltage between passenger seat cushion heater C3320-1, circuit CHS07 (GY/BU), harness side and ground.
      Fig 4: Checking Circuit CHS07 (GY/BU) For Short To Voltage (1 Of 2)
      G04683319Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the voltage between passenger seat cushion heater C334-1, circuit CHS07 (GY/BU), harness side and ground.
      Fig 5: Checking Circuit CHS07 (GY/BU) For Short To Voltage (2 Of 2)
      G04683320Courtesy of FORD MOTOR CO.
    • Is voltage present on the circuit? 

    Yes  : REPAIR circuit CHS07 (GY/BU). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to R5.

  5. R5 CHECK CIRCUIT CHS07 (GY/BU) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • For Zephyr, measure the resistance between passenger seat cushion heater C3320-1, circuit CHS07 (GY/BU), harness side and ground; and between C3320-1, circuit CHS07 (GY/BU), harness side and heated seat module C3304-8, circuit CHS07 (GY/BU) harness side.
      Fig 6: Checking Circuit CHS07 (GY/BU) For Open Or Short To Ground (1 Of 2)
      G04683321Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between passenger seat cushion heater C334-1, circuit CHS07 (GY/BU), harness side and ground; and between C334-1, circuit CHS07 (GY/BU), harness side and heated seat module C3304-8, circuit CHS07 (GY/BU) harness side.
      Fig 7: Checking Circuit CHS07 (GY/BU) For Open Or Short To Ground (2 Of 2)
      G04683322Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms between the passenger seat cushion heater and ground and less than 5 ohms between the passenger seat cushion heater and the heated seat module? 

    Yes  : GO to R6.

    No  : REPAIR circuit CHS07 (GY/BU). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  6. R6 CHECK CIRCUIT CHS12 (YE/GN) FOR SHORT TO VOLTAGE 
    • Disconnect: Passenger Seat Backrest Heater C335.
    • Key in ON position.
    • Measure the voltage between passenger seat cushion heater C3320-2, circuit CHS12 (YE/GN), harness side and ground.
      Fig 8: Checking Circuit CHS12 (YE/GN) For Short To Voltage (1 Of 2)
      G04683323Courtesy of FORD MOTOR CO.
    • Measure the voltage between passenger seat cushion heater C334-2, circuit CHS12 (YE/GN), harness side and ground.
      Fig 9: Checking Circuit CHS12 (YE/GN) For Short To Voltage (2 Of 2)
      G04683324Courtesy of FORD MOTOR CO.
    • Is voltage present on the circuit? 

    Yes  : REPAIR circuit CHS12 (YE/GN). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to R7.

  7. R7 CHECK CIRCUIT CHS12 (YE/GN) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • For Zephyr, measure the resistance between passenger seat cushion heater C3320-2, circuit CHS12 (YE/GN), harness side and ground; and between C3320-2, circuit CHS12 (YE/GN), harness side and passenger seat backrest heater C335-1, circuit CHS12 (YE/GN) harness side.
      Fig 10: Checking Circuit CHS12 (YE/GN) For Open Or Short To Ground (1 Of 2)
      G04683325Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between passenger seat cushion heater C334-2, circuit CHS12 (YE/GN), harness side and ground; and between C334-2, circuit CHS12 (YE/GN), harness side and passenger seat backrest heater C335-1, circuit CHS12 (YE/GN) harness side.
      Fig 11: Checking Circuit CHS12 (YE/GN) For Open Or Short To Ground (2 Of 2)
      G04683326Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms between the passenger seat cushion heater and ground and less than 5 ohms between the passenger seat cushion heater and passenger seat backrest heater? 

    Yes  : GO to R8.

    No  : REPAIR circuit CHS12 (YE/GN). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  8. R8 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN 
    • Measure the resistance between passenger seat backrest heater C335-2, circuit GD139 (BK/YE), harness side and ground.
      Fig 12: Checking Circuit GD139 (BK/YE) For Open
      G04683327Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to R9.

    No  : REPAIR circuit GD139 (BK/YE). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  9. R9 CHECK CUSHION HEATER FOR SHORT TO GROUND OR AN OPEN 
    • For Zephyr, measure the resistance between passenger cushion heater C3320 pin 1, circuit CHS07 (GY/BU), component side and C3320 pin 2, circuit CHS12 (YE/GN), component side; and between C334 pin 1, circuit CHS07 (GY/BU), component side and ground.
      Fig 13: Checking Cushion Heater For Short To Ground Or Open (1 Of 2)
      G04683332Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between passenger seat cushion heater C334 pin 1, circuit CHS07 (GY/BU), component side and C334 pin 2, circuit CHS12 (YE/GN), component side; and between C334 pin 1, circuit CHS07 (GY/BU), component side and ground.
      Fig 14: Checking Cushion Heater For Short To Ground Or Open (2 Of 2)
      G04683333Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1.6 ohms and less than 10 ohms between the passenger seat cushion heater pin 1 and pin 2 and greater than 10,000 ohms between the passenger seat cushion heater pin 1 and ground? 

    Yes  : GO to R10.

    No  : INSTALL a new passenger seat cushion heater. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  10. R10 CHECK THE SEAT BACKREST HEATER 
    • Measure the resistance between passenger seat backrest heater C335 pin 1, circuit CHS12 (YE/GN), component side and C335 pin 2, circuit GD139 (BK/YE), component side.
      Fig 15: Checking Seat Backrest Heater
      G04683334Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 0.9 ohm? 

    Yes  : GO to R11.

    No  : INSTALL a new driver seat backrest heater. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  11. R11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground and between C3304-16, circuit VHS27 (WH/OG), harness side and ground.
      Fig 16: Checking Heated Seat Temperature Sensor And Circuits For Short To Voltage
      G04683335Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 

    Yes  : REPAIR the affected circuit RHS05 (YE/VT) or VHS27 (WH/OG). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to R12.

  12. R12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and C3304-16, circuit VHS27 (WH/OG), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground.
      Fig 17: Checking Heated Seat Temperature Sensor And Circuits For Open Or Short To Ground
      G04683336Courtesy of FORD MOTOR CO.
    • Is the resistance less than 300,000 ohms and greater than 50 ohms between heated seat module pin 13 and pin 16 and greater than 10,000 ohms between heated seat module pin 13 and ground? 

    Yes  : GO to  R15.

    No  : GO to R13.

  13. R13 CHECK CIRCUIT RHS05 (YE/VT) FOR AN OPEN OR SHORT TO GROUND 
    • For Zephyr, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the passenger seat cushion heater C3320-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground.
      Fig 18: Checking Circuit RHS05 (YE/VT) For Open Or Short To Ground (1 Of 2)
      G04683337Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the passenger seat cushion heater C334-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground.
      Fig 19: Checking Circuit RHS05 (YE/VT) For Open Or Short To Ground (2 Of 2)
      G04683338Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the heated seat module and passenger seat cushion heater and greater than 10,000 ohms between the heated seat module and ground? 

    Yes  : GO to R14.

    No  : REPAIR circuit RHS05 (YE/VT). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  14. R14 CHECK CIRCUIT VHS27 (WH/OG) FOR AN OPEN OR SHORT TO GROUND 
    • For Zephyr, measure the resistance between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and passenger seat cushion heater C3320-3, circuit VHS27 (WH/OG), harness side; and between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and ground.
      Fig 20: Checking Circuit VHS27 (WH/OG) For Open Or Short To Ground (1 Of 2)
      G04683339Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and passenger seat cushion heater C334-3, circuit VHS27 (WH/OG), harness side; and between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and ground.
      Fig 21: Checking Circuit VHS27 (WH/OG) For Open Or Short To Ground (2 Of 2)
      G04683340Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the heated seat module and passenger seat cushion heater and greater than 10,000 ohms between the heated seat module and ground? 

    Yes  : INSTALL a new passenger seat cushion heater. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : REPAIR circuit VHS27 (WH/OG). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  15. R15 CHECK CIRCUIT CHS30 (GY/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: EATC Module C2356b (Zephyr) or C228b (Fusion and Milan).
    • Key in ON position.
    • Measure the voltage between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground.
      Fig 22: Checking Circuit CHS30 (GY/YE) For Short To Voltage
      G04683341Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.2 volt? 

    Yes  : GO to R16.

    No  : REPAIR circuit CHS30 (GY/YE). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  16. R16 CHECK CIRCUIT CHS30 (GY/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground.
      Fig 23: Checking Circuit CHS30 (GY/YE) For Short To Ground
      G04683342Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to R17.

    No  : REPAIR circuit CHS30 (GY/YE). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  17. R17 CHECK CIRCUIT CHS30 (GY/YE) FOR AN OPEN 
    • For Zephyr, measure the resistance between passenger heated seat module 13304-15, circuit CHS30 (GY/YE), harness side and EATC module C2356b-19, circuit CHS30 (GY/YE), harness side.
      Fig 24: Checking Circuit CHS30 (GY/YE) For Open (1 Of 2)
      G04683343Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and EATC module C228b-8, circuit CHS30 (GY/YE), harness side.
      Fig 25: Checking Circuit CHS30 (GY/YE) For Open (2 Of 2)
      G04683344Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to R18.

    No  : REPAIR circuit CHS30 (GY/YE). TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  18. R18 CHECK THE EATC MODULE OUTPUT 
    • Connect: EATC Module C2356b (Zephyr) or C228b (Fusion and Milan).
    • Connect: Heated Seat Module C3304.
    • Key in ON position.
      • NOTE: The following measurement must be taken by back-probing the heated seat module C3304.
      NOTE: The voltage on circuit CHS30 (GY/YE) should drop momentarily when the passenger heated seat control button is pressed.
      Fig 26: Checking EATC Module Output
      G04683345Courtesy of FORD MOTOR CO.
    • Measure the voltage between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground by back-probing heated seat module connector. Press the passenger heated seat control button on the EATC module and note the voltage.
    • Is the voltage greater than 10 volts before pressing the passenger heated seat control button, then momentarily drops when the heated seat control button is pressed? 

    Yes  : INSTALL a new heated seat module. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : If the voltage is greater than 10 volts but did not drop when the passenger heated seat button was pressed, INSTALL a new EATC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    If the voltage is less than 10 volts, INSTALL a new heated seat module. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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