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Pinpoint Test O: The Left Rear Heated Seat Is Inoperative - Does Not Operate In Low: 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. O1 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 C3162-11, 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 C3162-11, Circuit 10-HC21 (GY/OG), Harness Side And Ground
      G03203782Courtesy of FORD MOTOR CO.
    • Is the resistance 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  : INSTALL a new heated seat module. TEST the system for normal operation.
    2. No  : GO to O2.
  2. O2 CHECK CIRCUIT 10-HC21 (GY/OG) FOR OPEN OR SHORT TO GROUND 
    • Disconnect: Left Rear Heated Seat Switch C722.
    • Measure the resistance between left rear heated seat switch C722-6, circuit 10-HC21 (GY/OG), harness side and left rear heated seat module C3162-11, circuit 10-HC21 (GY/OG), harness side; and between left rear heated seat switch C722-6, circuit 10-HC21 (GY/OG), harness side and ground.
      Fig 2: Measuring Resistance Between Left Rear Heated Seat Switch C722-6, Circuit 10-HC21 (GY/OG), Harness Side
      G03203783Courtesy of FORD MOTOR CO.
    • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground? 
    1. Yes  : GO to O3.
    2. No  : REPAIR circuit 10-HC21 (GY/OG). TEST the system for normal operation.
  3. O3 CHECK CIRCUIT 10-HC21 (GY/OG) FOR SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the left rear heated seat module C3162-11, circuit 10-HC21 (GY/OG), harness side and ground.
      Fig 3: Measuring Voltage Between Left Rear Heated Seat Module C3162-11, Circuit 10-HC21 (GY/OG), Harness Side And Ground
      G03203784Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. Yes  : REPAIR circuit 10-HC21 (GY/OG). TEST the system for normal operation.
    2. No  : INSTALL a new heated seat switch. TEST the system for normal operation.
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