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Pinpoint Test O: The Heated Seat Is Inoperative - Left Rear

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
  1. O1 CHECK HEATED SEAT SWITCH INPUT RESISTANCE TO THE HEATED SEAT MODULE 
    • Key in OFF position.
    • Disconnect: Left Rear Heated Seat Module C3162
      • Fig 1: Checking Heated Seat Switch Input Resistance To Heated Seat Module
      GF0013087Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear heated seat module C3162-8, circuit 1020 (DG/VT), harness side and ground while pressing the heated seat switch.
      • left rear heated seat module C3162-11, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
    • Are resistances less than 75 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed? 
    1. YES  : Go to  O3.
    2. NO  : Go to  O2.
  2. O2 CHECK HEATED SEAT SWITCH GROUND CIRCUIT 57 (BK) 
    • Disconnect: Left Rear Heated Seat Switch C722
      • Fig 2: Checking Heated Seat Switch Ground Circuit 57 (BK)
      GF0013088Courtesy of FORD MOTOR CO.
    • Measure resistance between left rear heated seat switch C722-1, circuit 57 (BK), harness side and ground.
    • Is resistance less than 5 ohms? 
    1. YES  : INSTALL a new heated seat switch. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. O3 CHECK VOLTAGE TO HEATED SEAT MODULE CIRCUIT 1445 (RD/LG) 
      Fig 3: Checking Voltage To Heated Seat Module Circuit 1445 (RD/LG)
      GF0013089Courtesy of FORD MOTOR CO.
    • Measure voltage between left rear heated seat module C3162-12, circuit 1445 (RD/LG), harness side and ground.
    • Is voltage greater than 10 volts? 
    1. YES  : Go to  O4.
    2. NO  : VERIFY Battery Junction Box (BJB) fuse 2 (20A) is OK. If OK, REPAIR circuit 1445 (RD/LG). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAM ARTICLE to identify the possible causes of the circuit short. TEST the system for normal operation.
  4. O4 CHECK VOLTAGE TO HEATED SEAT MODULE CIRCUIT 1040 (RD/BK) 
    • Key in ON position.
      • Fig 4: Checking Voltage To Heated Seat Module Circuit 1040 (RD/BK)
      GF0013090Courtesy of FORD MOTOR CO.
    • Measure voltage between left rear heated seat module C3162-5, circuit 1040 (RD/BK), harness side and ground.
    • Is voltage greater than 10 volts? 
    1. YES  : Go to  O5.
    2. NO  : VERIFY Central Junction Box (CJB) fuse 17 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAM ARTICLE to identify the possible causes of the circuit short. TEST the system for normal operation.
  5. O5 CHECK HEATED SEAT MODULE GROUND CIRCUIT 57 (BK) 
    • Key in OFF position.
    • Measure resistance between left rear heated seat module C3162-1, circuit 57 (BK), harness side and ground.
    • Is resistance less than 5 ohms? 
    1. YES  : Go to  O6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. O6 CHECK SEAT CUSHION BACKREST HEATER RESISTANCE AND FOR A SHORT TO GROUND 
    • Measure resistance between:
      • left rear heated seat module C3162-6, circuit 1064 (YE/LB) harness side and C3162-7, circuit 1065 (WH/LB), harness side.
      • left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground.
    • Is resistance greater than 1.6 ohms and less than 10 ohms between heated seat module pins 6 and 7 and greater than 10,000 ohms between heated seat module and ground? 
    1. YES  : Go to  O7.
    2. NO  : Go to  O13.
  7. O7 CHECK SEAT CUSHION AND BACKREST HEATER CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure voltage between:
      • left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground.
      • left rear heated seat module C3162-7, circuit 1065 (WH/LB), harness side and ground.
    • Is voltage present on either circuit? 
    1. YES  : Go to  O8.
    2. NO  : Go to  O9.
  8. O8 CHECK CIRCUITS 1064 (YE/LB) AND 1065 (WH/LB) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Left Rear Seat Backrest Heater C3168
    • Key in ON position.
    • Measure voltage between:
      • left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground.
      • left rear heated seat module C3162-7, circuit 1065 (WH/LB), harness side and ground.
    • Is voltage present on either circuit? 
    1. YES  : REPAIR the circuit(s). TEST the system for normal operation.
    2. NO  : REPAIR circuit 1064 (YE/LB) between the left rear seat cushion heater C3167 and the left rear seat backrest heater C3168. TEST the system for normal operation.
  9. O9 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Measure voltage between:
      • left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and ground.
      • left rear heated seat module C3162-4, circuit 1060 (BK/LB), harness side and ground.
    • Is voltage present on either circuit? 
    1. YES  : REPAIR the circuit(s). TEST the system for normal operation.
    2. NO  : Go to  O10.
  10. O10 CHECK RESISTANCE OF HEATED SEAT TEMPERATURE SENSOR CIRCUITS 
    • Key in OFF position.
      • Fig 5: Checking Resistance Of Heated Seat Temperature Sensor Circuits
      GF0001861Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and C3162-4, circuit 1060 (BK/LB), harness side.
      • left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and ground.
    • Is resistance between 50 ohms and 300,000 ohms between heated seat module pins 3 and 4 and greater than 10,000 ohms between heated seat module and ground? 
    1. YES  : INSTALL a new left rear heated seat module. REFER to Heated Seat Module - Rear Seat . TEST the system for normal operation.
    2. NO  : Go to  O11.
  11. O11 CHECK CIRCUIT 1061 (BN/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Left Rear Seat Cushion Heater C3167
      • Fig 6: Checking Circuit 1061 (BN/LB) For An Open Or Short To Ground
      GF0018514Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and left rear seat cushion heater C3167-3, circuit 1061 (BN/LB), harness side.
      • left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and ground.
    • Is resistance less than 5 ohms between the heated seat module and seat cushion heater and greater than 10,000 ohms between heated seat module and ground? 
    1. YES  : Go to  O12.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  12. O12 CHECK CIRCUIT 1060 (BK/LB) FOR AN OPEN OR SHORT TO GROUND 
      Fig 7: Checking Circuit 1060 (BK/LB) For An Open Or Short To Ground
      GF0018515Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear heated seat module C3162-4, circuit 1060 (BK/LB), harness side and left rear seat cushion heater C3167-2, circuit 1060 (BK/LB), harness side.
      • left rear heated seat module C3162-4, circuit 1060 (BK/LB), harness side and ground.
    • Is resistance less than 5 ohms between heated seat module and seat cushion heater and greater than 10,000 ohms between heated seat module and ground? 
    1. YES  : INSTALL a new left rear seat cushion heater. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  13. O13 CHECK CIRCUIT 1064 (YE/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Left Rear Seat Cushion Heater C3167
      • Fig 8: Checking Circuit 1064 (YE/LB) For An Open Or Short To Ground
      GF0018516Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and left rear seat cushion heater C3167-1, circuit 1064 (YE/LB), harness side.
      • left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground.
    • Is resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground? 
    1. YES  : Go to  O14.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  14. O14 CHECK CIRCUIT 1065 (WH/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Left Rear Seat Backrest Heater C3168
      • Fig 9: Checking Circuit 1065 (WH/LB) For An Open Or Short To Ground
      GF0018517Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear heated seat module C3162-7, circuit 1065 (WH/LB), harness side and left rear seat backrest heater C3168-1, circuit 1065 (WH/LB), harness side.
      • left rear heated seat module C3162-7, circuit 1065 (WH/LB), harness side and ground.
    • Is resistance less than 5 ohms between heated seat module and seat backrest heater and greater than 10,000 ohms between the heated seat module and ground? 
    1. YES  : Go to  O15.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  15. O15 CHECK CIRCUIT 1064 (YE/LB) FOR AN OPEN OR SHORT TO GROUND BETWEEN THE HEATED SEAT MODULE AND SEAT BACKREST HEATER 
      Fig 10: Checking Circuit 1064 (YE/LB) For An Open Or Short To Ground Between Heated Seat Module & Seat Backrest Heater
      GF0018518Courtesy of FORD MOTOR CO.
    • Measure resistance between:
      • left rear seat cushion heater C3167-4, circuit 1064 (YE/LB), harness side and left rear seat backrest heater C3168-2, circuit 1064 (YE/LB), harness side.
      • left rear seat cushion heater C3167-4, circuit 1064 (YE/LB), harness side and ground.
    • Is resistance less than 5 ohms between seat cushion heater and seat backrest heater and greater than 10,000 ohms between seat cushion heater and ground? 
    1. YES  : Go to  O16.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  16. O16 CHECK SEAT BACKREST HEATER RESISTANCE 
      Fig 11: Checking Seat Backrest Heater Resistance
      G03999464Courtesy of FORD MOTOR CO.
    • Measure resistance between left rear seat backrest heater C3168 pins 1 and 2, component side.
    • Is resistance between 0.7 and 1.5 ohm? 
    1. YES  : INSTALL a new left rear seat cushion heater. TEST the system for normal operation.
    2. NO  : INSTALL a new left rear seat backrest heater. TEST the system for normal operation.
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