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Pinpoint Test L: The Left Rear Heated Seat Is Inoperative: Overview

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE 
    • Key in OFF position.
    • Disconnect: Left Rear Heated Seat Module C3162.
    • Measure the resistance between left rear heated seat module C3162-8, circuit 8-HC21 (WH/GN), harness side and ground and between C3162-11, circuit 10-HC21 (GY/OG), harness side and ground while pressing the heated seat switch.
      Fig 1: Measuring Resistance Between Left Rear Heated Seat Module C3162-8, Circuit 8-HC21 (WH/GN), Harness Side And Ground
      G03203749Courtesy of FORD MOTOR CO.
    • Are the resistances less than 50 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  L3.
    2. No  : GO to L2.
  2. L2 CHECK HEATED SEAT SWITCH GROUND CIRCUIT 31-HC15 (BK/YE) 
    • Disconnect: Left Rear Heated Seat Switch C722.
    • Measure the resistance between left rear heated seat switch C722-1, circuit 31-HC15 (BK/YE), harness side and ground.
      Fig 2: Measuring Resistance Between Left Rear Heated Seat Switch C722-1, Circuit 31-HC15 (BK/YE), Harness Side And Ground
      G03203750Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new heated seat switch. TEST the system for normal operation.
    2. No  : REPAIR circuit 31-HC15 (BK/YE). TEST the system for normal operation.
  3. L3 CHECK CIRCUIT 30-HC21 (RD/GN) FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Measure the voltage between left rear heated seat module C3162-12, circuit 30-HC21 (RD/GN), harness side and ground.
      Fig 3: Measuring Voltage Between Left Rear Heated Seat Module C3162-12, Circuit 30-HC21 (RD/GN), Harness Side And Ground
      G03203751Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to L4.
    2. No  : REPAIR circuit 30-HC21 (RD/GN). TEST the system for normal operation.
  4. L4 CHECK CIRCUIT 20-HC21D (PK/BK) FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Key in ON position.
    • Measure the voltage between left rear heated seat module C3162-5, circuit 20-HC21D (PK/BK), harness side and ground.
      Fig 4: Measuring Voltage Between Left Rear Heated Seat Module C3162-5, Circuit 20-HC21D (PK/BK), Harness Side And Ground
      G03203752Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to L5.
    2. No  : REPAIR circuit 20-HC21D (PK/BK). TEST the system for normal operation.
  5. L5 CHECK HEATED SEAT MODULE GROUND CIRCUIT 31-HC15 (BK/YE) 
    • Key in OFF position.
    • Measure the resistance between left rear heated seat module C3162-1, circuit 31-HC15 (BK/YE), harness side and ground.
      Fig 5: Measuring Resistance Between Left Rear Heated Seat Module C3162-1, Circuit 31-HC15 (BK/YE), Harness Side And Ground
      G03203753Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to L6.
    2. No  : REPAIR circuit 31-HC15 (BK/YE). TEST the system for normal operation.
  6. L6 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER CIRCUITS 
    • Measure the resistance between the left rear heated seat module C3162-6, circuit 20-HC17 (PK), harness side and C3162-7, circuit 31S-HC16 (BK/BU), harness side; and between the left rear heated seat module C3162-6, circuit 20-HC17 (PK), harness side and ground.
      Fig 6: Measuring Resistance Between Left Rear Heated Seat Module C3162-6, Circuit 20-HC17 (PK), Harness Side
      G03203754Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1.6 ohms and less than 10 ohms between C3162-6 and C3162-7 and greater than 10,000 ohms between C3162-6 and ground? 
    1. Yes  : GO to L7.
    2. No  : GO to  L12.
  7. L7 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the left rear heated seat module C3162-6, circuit 20-HC17 (PK), harness side and ground and between C3162-7, circuit 31S-HC16 (BK/BU), harness side and ground.
      Fig 7: Measuring Voltage Between Left Rear Heated Seat Module C3162-6, Circuit 20-HC17 (PK), Harness Side And Ground
      G03203755Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    1. Yes  : REPAIR the circuit 20-HC17 (PK), 31S-HC16 (BK/BU) or 20S-HC16 (PK/BU). TEST the system for normal operation.
    2. No  : GO to L8.
  8. L8 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the left rear heated seat module C3162-3, circuit 9-HC23 (BN/YE), harness side and ground and between C3162-4, circuit 8-HC23 (WH/BK), harness side and ground.
      Fig 8: Measuring Voltage Between Left Rear Heated Seat Module C3162-3, Circuit 9-HC23 (BN/YE), Harness Side And Ground
      G03203756Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    1. Yes  : REPAIR the affected circuit. TEST the system for normal operation.
    2. No  : GO to L9.
  9. L9 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS 
    • Key in OFF position.
    • Measure the resistance between the left rear heated seat module C3162-3, circuit 9-HC23 (BN/YE), harness side and C3162-4, circuit 8-HC23 (WH/BK), harness side; and between the left rear heated seat module C3162-3, circuit 9-HC23 (BN/YE), harness side and ground.
      Fig 9: Measuring Resistance Between Left Rear Heated Seat Module C3162-3, Circuit 9-HC23 (BN/YE), Harness Side
      G03203757Courtesy of FORD MOTOR CO.
    • Is the resistance less than 300,000 ohms and greater than 50 ohms between C3162-3 and C3162-4 and greater than 10,000 ohms between C3162-3 and ground? 
    1. Yes  : INSTALL a new left rear heated seat module. TEST the system for normal operation.
    2. No  : GO to L10.
  10. L10 CHECK CIRCUIT 9-HC23 (BN/YE) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Left Rear Seat Cushion Heater C3167.
    • Measure the resistance between the left rear heated seat module C3162-3, circuit 9-HC23 (BN/YE), harness side and the left rear seat cushion heater C3167-3, circuit 9-HC23 (BN/YE), harness side; and between the left rear heated seat module C3162-3, circuit 9-HC23 (BN/YE), harness side and ground.
      Fig 10: Measuring Resistance Between Left Rear Heated Seat Module C3162-3, Circuit 9-HC23 (BN/YE), Harness Side
      G03203758Courtesy of FORD MOTOR CO.
    • Is the 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 L11.
    2. No  : REPAIR circuit 9-HC23 (BN/YE). TEST the system for normal operation.
  11. L11 CHECK CIRCUIT 8-HC23 (WH/BK) FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between the left rear heated seat module C3162-4, circuit 8-HC23 (WH/BK), harness side and the left rear seat cushion heater C3167-2, circuit 8-HC23 (WH/BK), harness side; and between the left rear heated seat module C3162-4, circuit 8-HC23 (WH/BK), harness side and ground.
      Fig 11: Measuring Resistance Between Left Rear Heated Seat Module C3162-4, Circuit 8-HC23 (WH/BK), Harness Side
      G03203759Courtesy of FORD MOTOR CO.
    • Is the 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  : INSTALL a new left rear seat cushion heater. TEST the system for normal operation.
    2. No  : REPAIR circuit 8-HC23 (WH/BK). TEST the system for normal operation.
  12. L12 CHECK CIRCUIT 32-HC17 (WH/BU) FOR OPEN OR SHORT TO GROUND 
    • Disconnect: Left Rear Seat Cushion Heater C3167.
    • Measure the resistance between left rear heated seat module C3162-6, circuit 20S-HC17 (PK), harness side and left rear seat cushion heater C3167-1, circuit 20S-HC17 (PK), harness side; and between left rear heated seat module C3162-6, circuit 20S-HC17 (PK), harness side and ground.
      Fig 12: Measuring Resistance Between Left Rear Heated Seat Module C3162-6, Circuit 20S-HC17 (PK), Harness Side
      G03203760Courtesy of FORD MOTOR CO.
    • Is the resistance less than 1 ohm 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 L13.
    2. No  : REPAIR circuit 20S-HC17 (PK).TEST the system for normal operation.
  13. L13 CHECK CIRCUIT 31S-HC16 (BK/BU) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: Left Rear Seat Back Heater C3168.
    • Measure the resistance between left rear heated seat module C3162-7, circuit 31S-HC16 (BK/BU), harness side and left rear seat back heater C3168-2, circuit 31S-HC16 (BK/BU), harness side; and between left rear heated seat module C3162-7, circuit 31S-HC16 (BK/BU), harness side and ground.
      Fig 13: Measuring Resistance Between Left Rear Heated Seat Module C3162-7, Circuit 31S-HC16 (BK/BU), Harness Side
      G03203761Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the heated seat module and the seat back heater, and greater than 10,000 ohms between the heated seat module and ground? 
    1. Yes  : GO to L14.
    2. No  : REPAIR circuit 31S-HC16 (BK/BU). TEST the system for normal operation.
  14. L14 CHECK CIRCUIT 20S-HC16 (PK/BU) FOR AN OPEN OR A SHORT TO GROUND 
    • Measure the resistance between left rear seat cushion heater C3167-4, circuit 20S-HC16 (PK/BU), harness side and left rear seat back heater C3168-1, circuit 20S-HC16 (PK/BU), harness side; and between left rear seat cushion heater C3167-4, circuit 20S-HC16 (PK/BU), harness side and ground.
      Fig 14: Measuring Resistance Between Left Rear Seat Cushion Heater C3167-4, Circuit 20S-HC16 (PK/BU), Harness Side
      G03203762Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the seat cushion heater and the seat back heater, and greater than 10,000 ohms between the seat cushion heater and ground? 
    1. Yes  : GO to L15.
    2. No  : REPAIR circuit 20S-HC16 (PK/BU). TEST the system for normal operation.
  15. L15 CHECK THE SEAT BACK HEATER 
    • Disconnect: Left Rear Seat Back Heater Connector.
    • Measure the resistance between left rear seat back heater pin 1 and pin 2, seat back heater component side.
      Fig 15: Measuring Resistance Between Left Rear Seat Back Heater Pin 1 And Pin 2, Seat Back Heater Component Side
      G03203763Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.6 and 0.9 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 back heater. TEST the system for normal operation.
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