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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 512 (Seat System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test C: The Power Seat Does Not Move Horizontally/Vertically - Driver, Vehicles Without SIR >> Pinpoint Test C: The Power Seat Does Not Move Horizontally/Vertically - Driver, Vehicles Without Sir

Pinpoint Test C: The Power Seat Does Not Move Horizontally/Vertically - Driver, Vehicles Without Sir

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 DETERMINE WHICH DIRECTION HAS FAILED 
    • Operate the power seat forward and rearward.
    • Will the track move horizontally?

    Yes  : Go to  C5.

    No  : Go to C2.

  2. C2 CHECK THE VOLTAGE TO FORWARD/REVERSE SEAT MOTOR 
    • Disconnect: Power Seat Motor Assembly C357.
    • Measure the voltage between power seat motor assembly C357-4, circuit 981 (RD/WH) and C357-1, circuit 980 (YE/WH), harness side while pushing the forward/reverse switch forward and backward.
      Fig 1: Checking Voltage To Forward/Reverse Seat Motor
      G04645932Courtesy of FORD MOTOR CO.
    • Is the voltage greater than +10 volts when the forward/reverse switch is pressed forward, greater than -10 volts with the forward reverse switch is pressed backward, and 0 volts when the switch is in the rest position? 

    Yes  : INSTALL a new power seat track assembly. REFER to SEAT TRACK - BUCKET AND 40 PERCENT . TEST the system for normal operation.

    No  : Go to C3.

  3. C3 CHECK CIRCUIT 980 (YE/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C360.
    • Measure the resistance between seat control switch C360-7, circuit 980 (YE/WH), harness side and power seat motor assembly C357-1, circuit 980 (YE/WH), harness side and between seat control switch C360-7, circuit 980 (YE/WH), harness side and ground.
      Fig 2: Checking Circuit 980 (YE/WH) For Open And Short To Ground
      G04645933Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the power seat motor assembly and the seat control switch, and greater than 10,000 ohms between the seat control switch and ground? 

    Yes  : Go to C4.

    No  : REPAIR circuit 980 (YE/WH). TEST the system for normal operation.

  4. C4 CHECK CIRCUIT 981 (RD/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Measure the resistance between seat control switch C360-6, circuit 981 (RD/WH), harness side and power seat motor assembly C357-4, circuit 981 (RD/WH), harness side and between seat control switch C360-6, circuit 981 (RD/WH), harness side and ground.
      Fig 3: Checking Circuit 981 (RD/WH) For Open And Short To Ground
      G04645934Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the power seat motor assembly and the seat control switch, and greater than 10,000 ohms between the seat control switch and ground? 

    Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH . TEST the system for normal operation.

    No  : REPAIR circuit 981 (RD/WH). TEST the system for normal operation.

  5. C5 DETERMINE SEAT TILTING FAILURE 
    • Determine seat tilting failure.
    • Can the seat be tilted forward or backward? 

    Yes  : If only the forward tilting operates, Go to C6.

    If only the rear tilting operates, Go to  C9.

    No  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH . TEST the system for normal operation

  6. C6 CHECK THE VOLTAGE TO THE REAR HEIGHT MOTOR 
    • Disconnect: Power Seat Motor Assembly C357.
    • Measure the voltage between power seat motor assembly C357-2, circuit 983 (RD/LG), harness side and C357-3, circuit 982 (YE/LG), harness side while depressing the rear tilt switch up and down.
      Fig 4: Checking Voltage To Motor Connector
      G03890783Courtesy of FORD MOTOR CO.
    • Is the voltage greater than +10 volts when the rear tilt switch is pressed up, greater than -10 volts when the rear tilt switch is pressed down and 0 volts when the switch is in the rest position? 

    Yes  : INSTALL a new power seat track assembly. REFER to SEAT TRACK - BUCKET AND 40 PERCENT . TEST the system for normal operation.

    No  : Go to C7.

  7. C7 CHECK CIRCUIT 983 (RD/LG) FOR OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C360.
    • Measure the resistance between seat control switch C360-2, circuit 983 (RD/LG), harness side and power seat motor assembly C357-2, circuit 983 (RD/LG), harness side and between seat control switch C360-2, circuit 983 (RD/LG), harness side and ground.
      Fig 5: Checking Circuit 983 (RD/LG) For Open And Short To Ground
      G04645936Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the power seat motor assembly and the seat control switch, and greater than 10,000 ohms between the seat control switch and ground? 

    Yes  : Go to C8.

    No  : REPAIR circuit 983 (RD/LG). TEST the system for normal operation.

  8. C8 CHECK CIRCUIT 982 (YE/LG) FOR OPEN AND SHORT TO GROUND 
    • Measure the resistance between seat control switch C360-3, circuit 982 (YE/LG), harness side and power seat motor assembly C357-3, circuit 982 (YE/LG), harness side and between seat control switch C360-3, circuit 982 (YE/LG), harness side and ground.
      Fig 6: Checking Circuit 982 (YE/LG) For Open And Short To Ground
      G04645937Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the power seat motor assembly and the seat control switch, and greater than 10,000 ohms between the seat control switch and ground? 

    Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH . TEST the system for normal operation.

    No  : REPAIR circuit 982 (YE/LG). TEST the system for normal operation.

  9. C9 CHECK THE VOLTAGE TO FRONT HEIGHT MOTOR 
    • Disconnect: Power Seat Motor Assembly C357.
    • Measure the voltage between power seat motor assembly C357-5, circuit 990 (YE/LB), harness side and C357-6, circuit 979 (RD/LB), harness side while pushing the rear tilting switch up and down.
      Fig 7: Checking Voltage To Front Height Motor
      G04645938Courtesy of FORD MOTOR CO.
    • Is the voltage greater than -10 volts when the front tilt switch is pressed up, greater than +10 volts when the front tilt switch is pressed down and 0 volts when the switch is in the rest position? 

    Yes  : INSTALL a new power seat track assembly. REFER to SEAT TRACK - BUCKET AND 40 PERCENT . TEST the system for normal operation.

    No  : Go to C10.

  10. C10 CHECK CIRCUIT 979 (RD/LB) FOR OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C360.
    • Measure the resistance between seat control switch C360-5, circuit 979 (RD/LB), harness side and power seat motor assembly C357-6, circuit 979 (RD/LB), harness side and between seat control switch C360-5, circuit 979 (RD/LB), harness side and ground.
      Fig 8: Checking Circuit 979 (RD/LB) For Open And Short To Ground
      G04645939Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the power seat motor assembly and the seat control switch, and greater than 10,000 ohms between the seat control switch and ground? 

    Yes  : Go to C11.

    No  : REPAIR circuit 979 (RD/LB). TEST the system for normal operation.

  11. C11 CHECK CIRCUIT 990 (YE/LB) FOR OPEN 
    • Measure the resistance between seat control switch C360-1, circuit 990 (YE/LB), harness side and power seat motor assembly C357-5, circuit 990 (YE/LB), harness side and between seat control switch C360-1, circuit 990 (YE/LB), harness side and ground.
      Fig 9: Checking Circuit 990 (YE/LB) For Open
      G04645940Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the power seat motor assembly and the seat control switch, and greater than 10,000 ohms between the seat control switch and ground? 

    Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH . TEST the system for normal operation.

    No  : REPAIR circuit 990 (YE/LB). TEST the system for normal operation.

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