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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 823 (Seat System -- F250-F550 Super Duty) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test D: The Power Seat Does Not Move Horizontally/Vertically - Driver, Vehicles With SIR >> Pinpoint Test D: The Power Seat Does Not Move Horizontally/Vertically - Driver, Vehicles With Sir

Pinpoint Test D: The Power Seat Does Not Move Horizontally/Vertically - Driver, Vehicles With Sir

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 DETERMINE WHICH DIRECTION HAS FAILED 
    • Operate the power seat forward and rearward.
    • Will the track move horizontally? 
    1. YES  : Go to  D5.
    2. NO  : Go to  D2.
  2. D2 CHECK THE VOLTAGE TO FORWARD REVERSE SEAT MOTOR 
    • Disconnect: Power Seat Motor Assembly C357
    • Measure the voltage between power seat motor assembly C357-1, circuit 980 (YE/WH), harness side and C357-4, circuit 981 (RD/WH), harness side while pushing the forward/reverse switch forward and backward.
      Fig 1: Checking Voltage To Forward Reverse Seat Motor
      G03890780Courtesy of FORD MOTOR CO.
    • Is the voltage greater than -10 volts when the forward/reverse switch is pressed forward, greater than +10 volts when the forward/reverse switch is pressed backward and 0 volts when the switch is in the rest position? 
    1. YES  : INSTALL a new power seat track assembly. REFER to Seat Track - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
    2. NO  : Go to  D3.
  3. D3 CHECK CIRCUIT 980 (YE/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Regulator Control Switch C369
    • Measure the resistance between seat control switch C369-3, circuit 980 (YE/WH), harness side and power seat motor assembly C357-1, circuit 980 (YE/WH), harness side and between seat control switch C369-3, circuit 980 (YE/WH), harness side and ground.
      Fig 2: Checking Circuit 980 (YE/WH) For Open And Short To Ground
      GF0004936Courtesy 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? 
    1. YES  : Go to  D4.
    2. NO  : REPAIR circuit 980 (YE/WH). TEST the system for normal operation.
  4. D4 CHECK CIRCUIT 981 (RD/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Measure the resistance between seat control switch C369-5, circuit 981 (RD/WH), harness side and power seat motor assembly C357-4, circuit 981 (RD/WH), harness side and between seat control switch C369-5, circuit 981 (RD/WH), harness side and ground.
      Fig 3: Checking Circuit 981 (RD/WH) For Open And Short To Ground
      GF0004937Courtesy 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? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 981 (RD/WH). TEST the system for normal operation.
  5. D5 DETERMINE SEAT TILTING FAILURE 
    • Determine seat tilting failure.
    • Can the seat be tilted forward or backward? 
    1. YES  : If only the forward tilting operates, go to  D6 .

      If only the rear tilting operates, go to  D9 .

    2. NO  : INSTALL a new seat control switch. REFER to Seat Control Switch - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
  6. D6 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 Rear Height Motor
      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? 
    1. YES  : INSTALL a new power seat track assembly. REFER to Seat Track - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
    2. NO  : Go to  D7.
  7. D7 CHECK CIRCUIT 983 (RD/LG) FOR OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Regulator Control Switch C369
    • Measure the resistance between seat control switch C369-6, circuit 983 (RD/LG), harness side and power seat motor assembly C357-2, circuit 983 (RD/LG), harness side and between seat control switch C369-6, circuit 983 (RD/LG), harness side and ground.
      Fig 5: Checking Circuit 983 (RD/LG) For Open And Short To Ground
      GF0004938Courtesy 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? 
    1. YES  : Go to  D8.
    2. NO  : REPAIR circuit 983 (RD/LG). TEST the system for normal operation.
  8. D8 CHECK CIRCUIT 982 (YE/LG) FOR OPEN AND SHORT TO GROUND 
    • Measure the resistance between seat control switch C369-4, circuit 982 (YE/LG), harness side and power seat motor assembly C357-3, circuit 982 (YE/LG), harness side and between seat control switch C369-4, circuit 982 (YE/LG), harness side and ground.
      Fig 6: Checking Circuit 982 (YE/LG) For Open And Short To Ground
      GF0004939Courtesy 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? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 982 (YE/LG). TEST the system for normal operation.
  9. D9 CHECK THE VOLTAGE TO FRONT HEIGHT MOTOR - PASSENGER SEAT 
    • 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 - Passenger Seat
      G03890786Courtesy 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? 
    1. YES  : INSTALL a new power seat track assembly. REFER to Seat Track - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
    2. NO  : Go to  D10.
  10. D10 CHECK CIRCUIT 979 (RD/LB) FOR OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C369
    • Measure the resistance between seat control switch C369-2, circuit 979 (RD/LB), harness side and power seat motor assembly C357-6, circuit 979 (RD/LB), harness side and between seat control switch C369-2, circuit 979 (RD/LB), harness side and ground.
      Fig 8: Checking Circuit 979 (RD/LB) For Open And Short To Ground
      GF0004940Courtesy 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? 
    1. YES  : Go to  D11.
    2. NO  : REPAIR circuit 979 (RD/LB). TEST the system for normal operation.
  11. D11 CHECK CIRCUIT 990 (YE/LB) FOR OPEN 
    • Measure the resistance between seat control switch C369-8, circuit 990 (YE/LB), harness side and power seat motor assembly C357-5, circuit 990 (YE/LB), harness side and between seat control switch C369-8, circuit 990 (YE/LB), harness side and ground.
      Fig 9: Checking Circuit 990 (YE/LB) For Open
      GF0004941Courtesy 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? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch - With Seat Integrated Restraints (SIR)  in this article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 990 (YE/LB). TEST the system for normal operation.
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