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Pinpoint Test Q: The Heated Seats Are Inoperative - Rear

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. Q1 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE 
    • For electrical connector access, release and lower the rear 60 percent seat backrest. Refer to the appropriate steps in HEATED SEAT MODULE - REAR  .
    • Disconnect: Heated Seat Module C3162B.
    • Ignition ON.
    • Measure the voltage between:
      • rear heated seat module C3162B-2, circuit CBP33 (WH/BN), harness side and ground.
      • rear heated seat module C3162B-1, circuit SBB71 (WH/RD), harness side and ground.
        Fig 1: Measuring Voltage Between Rear Heated Seat Module C3162B-2, Circuit CBP33 (WH/BN), Harness Side And Ground
        G06063252Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
      1. Yes  : GO to Q2.
      2. No  : VERIFY Battery Junction Box (BJB) fuse 71 (20A) and Body Control Module (BCM) fuse 33 (10A) are OK. If OK, REPAIR the circuit(s). If not OK, REFER to the Wiring Diagrams Information to identify possible causes of the circuit short. TEST the system for normal operation.
  2. Q2 CHECK THE REAR HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between rear heated seat module C3162B-5, circuit GD134 (BK/VT), harness side and ground.
      Fig 2: Measuring Resistance Between Rear Heated Seat Module C3162B-5, Circuit GD134 (BK/VT), Harness Side And Ground
      G06063253Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      1. Yes  : GO to Q3.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
  3. Q3 CHECK THE REAR HEATED SEAT SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Heated Seat Module C3162A.
      • NOTE: This step will verify if the shared ground supplied to both heated seat switches is open by measuring the switch input resistance at the heated seat module.
      Fig 3: Measuring Resistance Between Rear Heated Seat Module C3162A-2, Circuit CHS46 (YE/GN), Harness Side And Ground
      G06076861Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear heated seat module C3162A-2, circuit CHS46 (YE/GN), harness side and ground while pressing the LH heated seat switch to high.
    • Is the resistance less than 30 ohms when the switch is pressed and greater than 10, 000 ohms when not pressed? 
      1. Yes  : GO to Q4.
      2. No  : REPAIR circuit GD139 (BK/YE). TEST the system for normal operation.
  4. Q4 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Measure the resistance between heated seat module C3162A-12, circuit RHS41 (GN/BN), harness side and C3162A-3, circuit VHS42 (GN), harness side.
      Fig 4: Measuring Resistance Between Heated Seat Module C3162A-12, Circuit RHS41 (GN/BN) And C3162A-3, Circuit VHS42 (GN)
      G06076860Courtesy of FORD MOTOR CO.
    • Is the resistance between 300 and 300K ohms? 
      1. Yes  : INSTALL a new heated seat module. REFER to HEATED SEAT MODULE - REAR  . TEST the system for normal operation.
      2. No  : REPAIR circuit RHS41 (GN/BN). TEST the system for normal operation.
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