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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 P: The Heated Seat is Inoperative - Passenger >> Pinpoint Test P: The Heated Seat Is Inoperative - Passenger

Pinpoint Test P: The Heated Seat Is Inoperative - Passenger

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. P1 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 passenger seat side air bag 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  P2.
    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 passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  2. P2 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  P3.
    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 passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  3. P3 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  P4.
    2. NO  : REPAIR circuit GD139 (BK/YE). 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 article.

  4. P4 CHECK CIRCUIT CHS07 (GY/BU) FOR A SHORT TO VOLTAGE 
    • Disconnect: Passenger Seat Cushion Heater C334/C3320
    • Key in ON position.
      • Fig 4: Measuring Voltage
      GF0018488Courtesy of FORD MOTOR CO.
    • For MKZ, measure the voltage between passenger seat cushion heater C3320-1, circuit CHS07 (GY/BU), harness side and ground.
      • Fig 5: Measuring Voltage
      GF0028263Courtesy 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.
    • Is any voltage present? 
    1. YES  : REPAIR circuit CHS07 (GY/BU). 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 article.

    2. NO  : Go to  P5.
  5. P5 CHECK CIRCUIT CHS07 (GY/BU) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 6: Checking Circuit For An Open Or Short To Ground - MKZ
      GF0018497Courtesy of FORD MOTOR CO.
    • For MKZ, 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 7: Checking Circuit For An Open Or Short To Ground - Fusion & Milan
      GF0028282Courtesy 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.
    • 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? 
    1. YES  : Go to  P6.
    2. NO  : REPAIR circuit CHS07 (GY/BU). 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 article.

  6. P6 CHECK CIRCUIT CHS12 (YE/GN) FOR A SHORT TO VOLTAGE 
    • Disconnect: Passenger Seat Backrest Heater C335
    • 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 passenger seat cushion heater C3320-2, circuit CHS12 (YE/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 passenger seat cushion heater C334-2, circuit CHS12 (YE/GN), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit CHS12 (YE/GN). 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 article.

    2. NO  : Go to  P7.
  7. P7 CHECK CIRCUIT CHS12 (YE/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 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 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 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.
    • 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? 
    1. YES  : Go to  P8.
    2. NO  : REPAIR circuit CHS12 (YE/GN). 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 article.

  8. P8 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN 
      Fig 12: Checking Circuit For Open
      GF0026282Courtesy of FORD MOTOR CO.
    • Measure the resistance between passenger seat backrest heater C335-2, circuit GD139 (BK/YE), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  P9.
    2. NO  : REPAIR circuit GD139 (BK/YE). 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 article.

  9. P9 CHECK CUSHION HEATER FOR A 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 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 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 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.
    • 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? 
    1. YES  : Go to  P10.
    2. NO  : INSTALL a new passenger seat cushion heater. 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 article.

  10. P10 CHECK THE SEAT BACKREST HEATER FOR AN OPEN 
      Fig 15: Checking Seat Backrest Heater
      GF0028272Courtesy of FORD MOTOR CO.
    • 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.
    • Is the resistance between 0.6 and 0.9 ohm? 
    1. YES  : Go to  P11.
    2. NO  : INSTALL a new driver seat backrest heater. 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 article.

  11. P11 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 Short To Voltage
      GF0028283Courtesy of FORD MOTOR CO.
    • 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.
    • Is any voltage present? 
    1. YES  : REPAIR the affected circuit RHS05 (YE/VT) or VHS27 (WH/OG). 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 article.

    2. NO  : Go to  P12.
  12. P12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 17: Checking Heated Seat Temperature Sensor And Circuits For Open Or Short To Ground
      GF0028284Courtesy of FORD MOTOR CO.
    • 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.
    • 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? 
    1. YES  : Go to  P15.
    2. NO  : Go to  P13.
  13. P13 CHECK CIRCUIT RHS05 (YE/VT) FOR AN OPEN OR SHORT TO GROUND 
      Fig 18: Checking Circuit 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 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 19: Checking Circuit 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 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.
    • 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? 
    1. YES  : Go to  P14.
    2. NO  : REPAIR circuit RHS05 (YE/VT). 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 article.

  14. P14 CHECK CIRCUIT VHS27 (WH/OG) FOR AN OPEN OR SHORT TO GROUND 
      Fig 20: Checking Circuit For Open Or Short To Ground - MKZ
      GF0028285Courtesy of FORD MOTOR CO.
    • For MKZ, 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 21: Checking Circuit For Open Or Short To Ground - Fusion & Milan
      GF0028286Courtesy 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.
    • 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? 
    1. YES  : INSTALL a new passenger seat cushion heater. 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 article.

    2. NO  : REPAIR circuit VHS27 (WH/OG). 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 article.

  15. P15 CHECK CIRCUIT CHS30 (GY/YE) 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: Checking Circuit For A Short To Voltage
      GF0028287Courtesy of FORD MOTOR CO.
    • Measure the voltage between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground.
    • Is the voltage less than 0.2 volt? 
    1. YES  : Go to  P16.
    2. NO  : REPAIR circuit CHS30 (GY/YE). 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 article.

  16. P16 CHECK CIRCUIT CHS30 (GY/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 23: Measuring Resistance
      GF0028288Courtesy of FORD MOTOR CO.
    • Measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  P17.
    2. NO  : REPAIR circuit CHS30 (GY/YE). 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 article.

  17. P17 CHECK CIRCUIT CHS30 (GY/YE) FOR AN OPEN 
      Fig 24: Checking Circuit CHS30 (GY/YE) For Open - MKZ
      GF0028289Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and HVAC module C2356b-19, circuit CHS30 (GY/YE), harness side.
      • Fig 25: Checking Circuit CHS30 (GY/YE) For Open - Fusion & Milan
      GF0028290Courtesy 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 HVAC module C228b-8, circuit CHS30 (GY/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  P18.
    2. NO  : REPAIR circuit CHS30 (GY/YE). 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 article.

  18. P18 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
      GF0028291Courtesy of FORD MOTOR CO.
      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.
    • 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 HVAC 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? 
    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 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 passenger heated seat button was pressed, INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. 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 article.

      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 passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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