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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Seat System - Seats) >> Diagnosis And Testing >> Seating >> Pinpoint Tests >> Pinpoint Test AM: The Heated Seat is Inoperative - Right Rear >> Pinpoint Test Am: The Heated Seat Is Inoperative - Right Rear

Pinpoint Test Am: The Heated Seat Is Inoperative - Right Rear

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. AM1 CHECK THE HEATED SEAT OPERATION 
    • Ignition ON.
    • Operate the right rear heated seat switch.
    • Does the seat operate in either setting? 
    • Yes  : If only the low setting operates, GO to  AM16.

      If only the high setting operates, GO to  AM17.

    • No  : GO to AM2.
  2. AM2 CHECK THE HEATED SEAT SWITCH INPUT 
    • Ignition OFF.
    • For electrical connector access, release and lower the rear 60 percent seat backrest. Refer to the appropriate steps in HEATED SEAT MODULE .
    • Disconnect: Rear Heated Seat Module C3162A.
    • Measure the resistance between rear heated seat module C3162A-8, circuit CHS50 (BU/GY), harness side and ground while pressing the heated seat switch to high.
      Fig 1: Measuring Resistance Between Rear Heated Seat Module C3162A-8, Circuit CHS50 (BU/GY) And Ground
      G06063329Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms when the switch is pressed and greater than 10, 000 ohms when not pressed? 
    • Yes  : GO to  AM4.
    • No  : GO to AM3.
  3. AM3 CHECK THE HEATED SEAT SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Right Rear Heated Seat Switch C831.
    • Measure the resistance between right rear heated seat switch C831-6, circuit GD179 (BK/VT), harness side and ground.
      Fig 2: Measuring Resistance Between Right Rear Heated Seat Switch C831-6, Circuit GD179 (BK/VT) And Ground
      G06458572Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : INSTALL a new heated seat switch. REFER to HEATED SEAT SWITCH .
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. AM4 CHECK VOLTAGE TO THE RIGHT REAR HEATED SEAT MODULE FEED CIRCUIT 
    • Disconnect: Rear Heated Seat Module C3162B.
    • Measure the voltage between rear heated seat module C3162B-3, circuit SBB42 (YE/RD), harness side and ground.
      Fig 3: Measuring Voltage Between Rear Heated Seat Module C3162B-3, Circuit SBB42 (YE/RD) And Ground
      G06134344Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to AM5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. AM5 CHECK THE HEATER CIRCUITS AND HEATER MATS FOR AN OPEN 
    • Measure the resistance between rear heated seat module C3162B-6, circuit CHS44 (GN/VT), harness side and ground.
      Fig 4: Measuring Resistance Between Rear Heated Seat Module C3162B-6, Circuit CHS44 (GN/VT) And Ground
      G06063274Courtesy of FORD MOTOR CO.
    • Is the resistance between 2.5 and 4.5 ohms? 
    • Yes  : GO to  AM11.
    • No  : GO to AM6.
  6. AM6 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Right Rear Cushion Heater Mat C3169.
    • Measure the resistance between right rear cushion heater mat C3169-2, circuit GD179 (BK/VT), harness side and ground.
      Fig 5: Measuring Resistance Between Right Rear Cushion Heater Mat C3169-2, Circuit GD179 (BK/VT) And Ground
      G08596141Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to AM7.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  7. AM7 CHECK THE HEATER CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Right Rear Backrest Heater Mat C3170.
    • Measure the resistance between:
      • rear heated seat module C3162B-6, circuit CHS44 (GN/VT), harness side and right rear backrest heater mat C3170-1, circuit CHS44 (GN/VT), harness side.
      • rear heated seat module C3162B-6, circuit CHS44 (GN/VT), harness side and ground.
        Fig 6: Checking Heater Circuit For Open Or Short To Ground
        G06458592Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms between C3162B-6 and C3170-1, and greater than 10, 000 ohms between C3162B-6 and ground? 
    • Yes  : GO to AM8.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  8. AM8 CHECK THE BACKREST HEATER MAT FOR AN OPEN 
    • Measure the resistance between right rear backrest heater mat C3170 pins 1 and 4, component side.
      Fig 7: Measuring Resistance Between Right Rear Backrest Heater Mat C3170 Pins 1 And 4
      G06063262Courtesy of FORD MOTOR CO.
    • Is the resistance between 1.5 and 2.5 ohms? 
  9. AM9 CHECK FOR AN OPEN OR A SHORT TO GROUND BETWEEN THE HEATER MATS 
    • Measure the resistance between:
      • right rear backrest heater mat C3170-4, circuit CHS43 (GY/BU), harness side and right rear cushion heater mat C3169-1, circuit CHS43 (GY/BU), harness side.
      • right rear seat backrest heater mat C3170-4, circuit CHS43 (GY/BU), harness side and ground.
        Fig 8: Checking For Open Or Short To Ground Between The Heater Mats
        G08596144Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms between C3170-4 and C3169-1, and greater than 10, 000 ohms between C3169-4 and ground? 
    • Yes  : GO to AM10.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  10. AM10 CHECK THE CUSHION HEATER MAT FOR AN OPEN 
    • Measure the resistance between right rear cushion heater mat C3169 pins 1 and 2, component side.
      Fig 9: Measuring Resistance Between Right Rear Cushion Heater Mat C3169 Pins 1 And 2
      G08596145Courtesy of FORD MOTOR CO.
    • Is the resistance between 1 and 2 ohms? 
    • Yes  : The fault is intermittent. CHECK the electrical connectors for corrosion, poor pin contact or pushed out pins, particularly the pins and terminals of electrical connectors that were disconnected. Do not install any new components at this time. Components should only be installed when directed to do so in the pinpoint test  . REPAIR any intermittent wiring, terminal or connector concerns found. TEST the system for normal operation.
    • No  : INSTALL a new rear seat cushion heater mat. REFER to SEAT CUSHION HEATER MAT . TEST the system for normal operation.
  11. AM11 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between heated seat module C3162A-9, circuit VHS62 (GN/WH), harness side and ground.
      Fig 10: Measuring Voltage Between Heated Seat Module C3162A-9, Circuit VHS62 (GN/WH) And Ground
      G06076886Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to AM12.
  12. AM12 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between heated seat module C3162A-9, circuit VHS62 (GN/WH), harness side and ground.
      Fig 11: Measuring Resistance Between Heated Seat Module C3162A-9, Circuit VHS62 (GN/WH), Harness Side And Ground
      G06134352Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to AM13.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  13. AM13 CHECK RIGHT REAR HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between rear heated seat module C3162A-9, circuit VHS62 (GN/WH), harness side and C3162A-12, circuit RHS41 (GN/BN), harness side.
      Fig 12: Measuring Resistance Between Rear Heated Seat Module C3162A-9, Circuit VHS62 (GN/WH) And C3162A-12, Circuit RHS41 (GN/BN)
      G08596148Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 and 300K ohms? 
    • Yes  : INSTALL a new heated seat module. REFER to HEATED SEAT MODULE . TEST the system for normal operation.
    • No  : GO to AM14.
  14. AM14 CHECK THE TEMPERATURE SENSOR FOR AN OPEN 
    • Disconnect: Right Rear Backrest Heater Mat C3170.
    • Measure the resistance between rear backrest heater mat C3170 pins 2 and 3, component side.
      Fig 13: Measuring Resistance Between Rear Backrest Heater Mat C3170 Pins 2 And 3
      G06063259Courtesy of FORD MOTOR CO.
    • Is the resistance between 8, 000 and 15, 000 ohms? 
  15. AM15 CHECK THE TEMPERATURE SENSOR FOR AN OPEN WITH THE HEATER MAT DISCONNECTED 
    • Measure the resistance between rear heated seat module C3162A-9, circuit VHS62 (GN/WH), harness side and left rear backrest heater mat C3170-2, circuit VHS62 (GN/WH), harness side.
      Fig 14: Measuring Resistance Between Rear Heated Seat Module C3162A-9, Circuit VHS62 (GN/WH) And Left Rear Backrest Heater Mat C3170-2, Circuit VHS62 (GN/WH)
      G08596150Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear heated seat module C3162A-12, circuit RHS41 (GN/BN), harness side and left rear backrest heater mat C3170-3, circuit RHS41 (GN/BN), harness side.
      Fig 15: Measuring Resistance Between Rear Heated Seat Module C3162A-12, Circuit RHS41 (GN/BN) And Left Rear Backrest Heater Mat C3170-3, Circuit RHS41 (GN/BN)
      G08596133Courtesy of FORD MOTOR CO.
    • Are the resistances less than 3 ohms? 
    • Yes  : INSTALL a new backrest heater mat. REFER to SEAT BACKREST HEATER MAT - REAR . TEST the system for normal operation.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  16. AM16 CHECK THE HIGH HEAT REQUEST CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Ignition OFF.
    • For electrical connector access, release and lower the rear 60 percent seat backrest. Refer to the appropriate steps in HEATED SEAT MODULE .
    • Disconnect: Rear Heated Seat Module C3162A.
    • Disconnect: Right Rear Heated Seat Switch C831.
    • Measure the resistance between:
      • rear heated seat module C3162A-8, circuit CHS50 (BU/GY), harness side and right rear heated seat switch C831-5, circuit CHS50 (BU/GY), harness side.
      • rear heated seat module C3162A-8, circuit CHS50 (BU/GY), harness side and ground.
        Fig 16: Checking High Heat Request Circuit For Open Or Short To Ground
        G06458600Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms between C3162A-8 and C831-5 and greater than 10, 000 ohms between C3162A-8 and ground? 
    • Yes  : GO to  AM18.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  17. AM17 CHECK THE LOW HEAT REQUEST CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Ignition OFF.
    • For electrical connector access, release and lower the rear 60 percent seat backrest. Refer to the appropriate steps in HEATED SEAT MODULE .
    • Disconnect: Rear Heated Seat Module C3162A.
    • Disconnect: Right Rear Heated Seat Switch C831.
    • Measure the resistance between:
      • rear heated seat module C3162A-7, circuit CHS51 (YE/GY), harness side and right rear heated seat switch C831-1, circuit CHS51 (YE/GY), harness side.
      • rear heated seat module C3162A-7, circuit CHS51 (YE/GY), harness side and ground.
        Fig 17: Checking Low Heat Request Circuit For Open Or Short To Ground
        G06458601Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms between C3162A-7 and C831-1 and greater than 10, 000 ohms between C3162A-7 and ground? 
    • Yes  : GO to AM18.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  18. AM18 CHECK THE HEATED SEAT SWITCH 
    • Disconnect: Right Rear Heated Seat Switch C831.
    • Use the following chart and measure the resistance between rear heated seat switch pins, component side, while pressing the indicated switch buttons and compare the results.
      Heated Seat Switch Mode Pins Ohms
      High 5 and 6 Less than 5
      At rest 5 and 6 Greater than 10, 000
      Low 1 and 6 Less than 5
      At rest 1 and 6 Greater than 10, 000
      Fig 18: Measuring Resistance Between Rear Heated Seat Switch Pins
      G06134341Courtesy of FORD MOTOR CO.
    • Is the heated seat switch OK? 
    • Yes  : INSTALL a new heated seat module. REFER to HEATED SEAT MODULE . TEST the system for normal operation.
    • No  : INSTALL a new heated seat switch. REFER to HEATED SEAT SWITCH .
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