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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1394 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test O: The Heated Seat is Inoperative - Driver >> Pinpoint Test O: The Heated Seat Is Inoperative - Driver

Pinpoint Test O: The Heated Seat Is Inoperative - Driver

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The air bag warning indicator illuminates when the correct restraints control module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. O1 CHECK CIRCUIT SBB11 (BU/RD) FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM article.
    • Disconnect the driver seat side air bag module C327.
    • Disconnect the passenger seat side air bag module C313.
    • Disconnect: Heated Seat Module C3304
      • 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 article.
      • Fig 1: Measuring Voltage
      GF0018485Courtesy of FORD MOTOR CO.
    • 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.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  O2.
    2. NO  : VERIFY battery junction box (BJB) fuse 11 (20A Fusion and Milan) (30A MKZ) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  2. O2 CHECK CIRCUIT CBP19 (BN/WH) FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Key in ON position.
      • Fig 2: Measuring Voltage
      GF0018486Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated seat module C3304-2, circuit CBP19 (BN/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  O3.
    2. NO  : VERIFY smart junction box (SJB) fuse 28 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  3. O3 CHECK HEATED SEAT MODULE GROUND CIRCUIT GD139 (BK/YE) FOR AN OPEN 
    • Key in OFF position.
      • Fig 3: Measuring Resistance
      GF0018487Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C3304-7, circuit GD139 (BK/YE), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  O4.
    2. NO  : REPAIR circuit GD139 (BK/YE). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  4. O4 CHECK CIRCUIT CHS02 (YE/BU) FOR SHORT TO VOLTAGE 
    • Disconnect: Driver Seat Cushion Heater C364
    • Key in ON position.
      • Fig 4: Measuring Voltage
      GF0018488Courtesy of FORD MOTOR CO.
    • For MKZ, measure the voltage between driver seat cushion heater C3298-1, circuit CHS02 (YE/BU), harness side and ground.
      • Fig 5: Measuring Voltage
      GF0028263Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the voltage between driver seat cushion heater C364-1, circuit CHS02 (YE/BU), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit CHS02 (YE/BU). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    2. NO  : Go to  O5.
  5. O5 CHECK CIRCUIT CHS02 (YE/BU) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 6: Measuring Resistance
      GF0028264Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between driver seat cushion heater C3298-1, circuit CHS02 (YE/BU), harness side and ground; and between C3298-1, circuit CHS02 (YE/BU), harness side and heated seat module C3304-9, circuit CHS02 (YE/BU) harness side.
      • Fig 7: Measuring Resistance
      GF0028265Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between driver seat cushion heater C364-1, circuit CHS02 (YE/BU), harness side and ground; and between C364-1, circuit CHS02 (YE/BU), harness side and heated seat module C3304-9, circuit CHS02 (YE/BU) harness side.
    • Is the resistance greater than 10,000 ohms between the driver seat cushion heater and ground and less than 5 ohms between the driver seat cushion heater and the heated seat module? 
    1. YES  : Go to  O6.
    2. NO  : REPAIR circuit CHS02 (YE/BU). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  6. O6 CHECK CIRCUIT CHS11 (VT/GN) FOR A SHORT TO VOLTAGE 
    • Disconnect: Driver Seat Backrest Heater C365
    • Key in ON position.
      • Fig 8: Checking Circuit For A Short To Voltage - MKZ
      GF0028266Courtesy of FORD MOTOR CO.
    • For MKZ, measure the voltage between driver seat cushion heater C3298-2, circuit CHS11 (VT/GN), harness side and ground.
      • Fig 9: Checking Circuit For A Short To Voltage - Fusion & Milan
      GF0028267Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the voltage between driver seat cushion heater C364-2, circuit CHS11 (VT/GN), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit CHS11 (VT/GN). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    2. NO  : Go to  O7.
  7. O7 CHECK CIRCUIT CHS11 (VT/GN) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 10: Checking Circuit For An Open Or Short To Ground - MKZ
      GF0028268Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between driver seat cushion heater C3298-2, circuit CHS11 (VT/GN), harness side and ground; and between C3298-2, circuit CHS11 (VT/GN), harness side and driver seat backrest heater C365-1, circuit CHS11 (VT/GN) harness side.
      • Fig 11: Checking Circuit For An Open Or Short To Ground - Fusion & Milan
      GF0028269Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between driver seat cushion heater C364-2, circuit CHS11 (VT/GN), harness side and ground; and between C364-2, circuit CHS11 (VT/GN), harness side and driver seat backrest heater C365-1, circuit CHS11 (VT/GN) harness side.
    • Is the resistance greater than 10,000 ohms between the driver seat cushion heater and ground and less than 5 ohms between the driver seat cushion heater and driver seat backrest heater? 
    1. YES  : Go to  O8.
    2. NO  : REPAIR circuit CHS11 (VT/GN). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  8. O8 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN 
      Fig 12: Checking Circuit For Open
      GF0026282Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat backrest heater C365-2, circuit GD126 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  O9.
    2. NO  : REPAIR circuit GD126 (BK/WH). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  9. O9 CHECK CUSHION HEATER FOR SHORT TO GROUND OR AN OPEN 
      Fig 13: Checking Cushion Heater For Short To Ground Or Open - MKZ
      GF0028270Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between driver seat cushion heater C3298 pin 1, circuit CHS02 (YE/BU), component side and C3298 pin 2, circuit CHS11 (VT/GN), component side; and between C3298 pin 1, circuit CHS02 (YE/BU), component side and ground.
      • Fig 14: Checking Cushion Heater For Short To Ground Or Open - Fusion & Milan
      GF0028271Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between driver seat cushion heater C364 pin 1, circuit CHS02 (YE/BU), component side and C364 pin 2, circuit CHS11 (VT/GN), component side; and between C364 pin 1, circuit CHS02 (YE/BU), component side and ground.
    • Is the resistance greater than 1.6 ohms and less than 10 ohms between driver seat cushion heater pin 1 and pin 2; and greater than 10,000 ohms between driver seat cushion heater pin 1 and ground? 
    1. YES  : Go to  O10.
    2. NO  : INSTALL a new driver seat cushion heater. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  10. O10 CHECK THE SEAT BACKREST HEATER FOR AN OPEN 
      Fig 15: Checking Seat Backrest Heater
      GF0028272Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat backrest heater C365 pin 1, circuit CHS11 (VT/GN), component side and C365 pin 2, circuit GD126 (BK/WH), component side.
    • Is the resistance between 0.6 and 0.9 ohm? 
    1. YES  : Go to  O11.
    2. NO  : INSTALL a new driver seat backrest heater. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  11. O11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 16: Checking Heated Seat Temperature Sensor And Circuits For A Short To Voltage
      GF0018492Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground and between C3304-10, circuit VHS26 (VT), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the affected circuit RHS05 (YE/VT) or VHS26 (VT). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    2. NO  : Go to  O12.
  12. O12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 17: Measuring Resistance
      GF0018493Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and C3304-10, circuit VHS26 (VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground.
    • Is the resistance less than 300,000 ohms and greater than 50 ohms between heated seat module pin 13 and pin 10 and greater than 10,000 ohms between heated seat module pin 13 and ground? 
    1. YES  : Go to  O15.
    2. NO  : Go to  O13.
  13. O13 CHECK CIRCUIT RHS05 (YE/VT) FOR AN OPEN OR SHORT TO GROUND 
      Fig 18: Checking Circuit RHS05 (YE/VT) For Open Or Short To Ground - MKZ
      GF0028273Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the driver seat cushion heater C3298-4, 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 - Fusion & Milan
      GF0028274Courtesy 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 driver seat cushion heater C364-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground.
    • Is the resistance less than 5 ohms between the heated seat module and the driver seat cushion heater and greater than 10,000 ohms between the heated seat module and ground? 
    1. YES  : Go to  O14.
    2. NO  : REPAIR circuit RHS05 (YE/VT). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  14. O14 CHECK CIRCUIT VHS26 (VT) FOR AN OPEN OR SHORT TO GROUND 
      Fig 20: Checking Circuit VHS26 (VT) For Open Or Short To Ground - MKZ
      GF0028275Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between heated seat module C3304-10, circuit VHS26 (VT), harness side and driver seat cushion heater C3298-3, circuit VHS26 (VT), harness side; and between heated seat module C3304-10, circuit VHS26 (VT), harness side and ground.
      • Fig 21: Checking Circuit VHS26 (VT) For Open Or Short To Ground - Fusion & Milan
      GF0028276Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between heated seat module C3304-10, circuit VHS26 (VT), harness side and driver seat cushion heater C364-3, circuit VHS26 (VT), harness side; and between heated seat module C3304-10, circuit VHS26 (VT), harness side and ground.
    • Is the resistance less than 5 ohms between the heated seat module and the driver seat cushion heater and greater than 10,000 ohms between the heated seat module and ground? 
    1. YES  : INSTALL a new driver seat cushion heater. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    2. NO  : REPAIR circuit VHS26 (VT). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  15. O15 CHECK CIRCUIT CHS29 (WH/BU) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: HVAC Module C2356b (MKZ) or C228b (Fusion and Milan)
    • Key in ON position.
      • Fig 22: Measuring Voltage
      GF0028277Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and ground.
    • Is the voltage less than 0.2 volt? 
    1. YES  : Go to  O16.
    2. NO  : REPAIR circuit CHS29 (WH/BU). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  16. O16 CHECK CIRCUIT CHS29 (WH/BU) FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 23: Measuring Resistance
      GF0028278Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  O17.
    2. NO  : REPAIR circuit CHS29 (WH/BU). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  17. O17 CHECK CIRCUIT CHS29 (WH/BU) FOR AN OPEN 
      Fig 24: Measuring Resistance
      GF0028279Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and HVAC module C2356b-6, circuit CHS29 (WH/BU), harness side.
      • Fig 25: Measuring Resistance
      GF0028280Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and HVAC module C228b-7, circuit CHS29 (WH/BU), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  O18.
    2. NO  : REPAIR circuit CHS29 (WH/BU). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  18. O18 CHECK THE HVAC MODULE OUTPUT 
    • Connect: HVAC Module C2356b (MKZ) or C228b (Fusion and Milan)
    • Connect: Heated Seat Module C3304
    • Key in ON position.
      • Fig 26: Checking HVAC Module Output
      GF0028281Courtesy of FORD MOTOR CO.
      NOTE: The following measurement must be taken by back-probing the heated seat module C3304.
      NOTE: The voltage on circuit CHS29 (WH/BU) should drop momentarily when the driver heated seat control button is pressed.
    • Measure the voltage between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and ground by back-probing heated seat module connector. Press the driver heated seat control button on the HVAC module and note the voltage.
    • Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module . TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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