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Pinpoint Test V: The Heated Seats Are Inoperative - Rear

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Never install heated seat parts not intended for use on this vehicle. Parts released for other model years or vehicle lines are not compatible even if they appear visually and physically similar. Installing incorrect parts will result in heated seat system performance outside design specification. Failure to follow this instruction may result in serious personal injury.
  1. V1 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • Disconnect: Heated Seat Module C3162.
    • Ignition ON.
    • Measure the voltage between:
      • heated seat module C3162-2, circuit CBP35 (YE/GY), harness side and ground.
      • heated seat module C3162-1, circuit SBB07 (WH/RD), harness side and ground.
        Fig 1: Measuring Voltage Between Heated Seat Module C329-2, Circuit CBP35 (YE/GY), Harness Side And Ground
        G06504163Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes:  GO to V2  .
    • No:  VERIFY Battery Junction Box (BJB) fuse 7 (30A) and Smart Junction Box (SJB) fuse 35 (10A) are OK. If OK, REPAIR the affected circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX to identify possible causes of the circuit short. TEST the system for normal operation.
  2. V2 CHECK THE HEATED SEAT MODULE GROUND 
    • Ignition OFF.
    • Measure the resistance between heated seat module C3162-7, circuit GD133 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Heated Seat Module C329-7, Circuit GD133 (BK), Harness Side And Ground
      G06504164Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to V3  .
    • No:  REPAIR the circuit. TEST the system for normal operation.
  3. V3 CHECK THE SENSOR RETURN CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between heated seat module C3162-13, circuit RHS41 (GN/BN), harness side and ground.
      Fig 3: Measuring Voltage Between Heated Seat Module C329-13, Circuit RHS05 (YE/VT), Harness Side And Ground
      G06504165Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit. TEST the system for normal operation.
    • No:  GO to V4  .
  4. V4 CHECK THE SENSOR RETURN CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between heated seat module C3162- 13, circuit RHS41 (GN/BN), harness side and ground.
      Fig 4: Measuring Resistance Between Heated Seat Module C329-13, Circuit RHS05 (YE/VT), Harness Side And Ground
      G06504166Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to V5  .
    • No:  REPAIR the circuit. TEST the system for normal operation.
  5. V5 CHECK THE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Disconnect: Right Rear Heated Seat C3169.
    • Measure the resistance between heated seat module C3162- 13, circuit RHS41 (GN/BN), harness side and right rear heated seat C3169-3, circuit RHS41 (GN/BN), harness side.
      Fig 5: Measuring Resistance Between Heated Seat Module C3162- 13 And Right Rear Heated Seat C3169-3
      G06504211Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  INSTALL a new heated seat module. REFER to HEATED SEAT MODULE - REAR SEAT . TEST the system for normal operation.
    • No:  REPAIR the circuit. TEST the system for normal operation.
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