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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Seat System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test H: Seat Does Not Heat But The Heated Seat Indicator Illuminates When Pressed

Pinpoint Test H: Seat Does Not Heat But The Heated Seat Indicator Illuminates When Pressed

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Test Step 

  1. H1 CHECK CIRCUIT 1064 (YE/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Heated Seat Switch C320 (Driver) or C321 (Passenger).
    • Disconnect: Heated Seat Cushion Element C364 (Driver) or C334 (Passenger).
    • Measure the resistance between driver heated seat switch C320 (passenger C321) pin 1, circuit 1064 (YE/LB), harness side and driver heated seat cushion element C364 (passenger C334) pin 4, circuit 1064 (YE/LB) harness side.
      Fig 1: Checking Circuit 1064 (YE/LB) For Open
      G03911392Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 

    Result / Action to Take 

    • Yes  : GO to H2.
    • No  : REPAIR circuit 1064 (YE/LB). TEST the system for normal operation.
  2. H2 CHECK HEATED SEAT CUSHION ELEMENT FOR AN OPEN 
    • Measure the resistance between driver heated seat cushion C364 (passenger C334) pin 1 and pin 4, component side.
      Fig 2: Checking Heated Seat Cushion Element For Open
      G03925400Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to H3.
    • No  : INSTALL a new heated seat cushion element. TEST the system for normal operation.
  3. H3 CHECK CIRCUIT 1066 (GY/LB) FOR AN OPEN 
    • Disconnect: Seat Back Heater C365 (Driver) or C335 (Passenger).
    • Measure the resistance between driver heated seat cushion element C364 (passenger C334) pin 1, circuit 1066 (GY/LB), harness side and driver heated seat backrest element C365 (passenger C335) pin 2, circuit 1066 (GY/LB), harness side.
      Fig 3: Checking Circuit 1066 (GY/LB) For Open
      G03911394Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to H4.
    • No  : REPAIR circuit 1066 (GY/LB). TEST the system for normal operation.
  4. H4 CHECK CIRCUIT 1066 (GY/LB) A SHORT TO GROUND 
    • Measure the resistance between driver heated seat cushion element C364 (passenger C334) pin 1, circuit 1066 (GY/LB), harness side and ground.
      Fig 4: Checking Circuit 1066 (GY/LB) Short To Ground
      G03911395Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to H5.
    • No  : REPAIR circuit 1066 (GY/LB). TEST the system for normal operation.
  5. H5 CHECK HEATED SEAT BACKREST ELEMENT FOR AN OPEN 
    • Measure the resistance between driver heated seat backrest element C365 (passenger C335) pin 1 and pin 2, component side.
      Fig 5: Checking Heated Seat Backrest Element For An Open
      G03999464Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to H6.
    • No  : INSTALL a new heated seat back element. TEST the system for normal operation.
  6. H6 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between driver heated seat backrest element C365 (passenger C335) pin 1, circuit 57 (BK) harness side and ground.
      Fig 6: Checking Circuit 57 (BK) For Open
      G03911397Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new heated seat switch. TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
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