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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 E: The Power Seat Does Not Move Horizontally/Vertically - Passenger, Vehicles Without SIR >> Pinpoint Test E: The Power Seat Does Not Move Horizontally/Vertically - Passenger, Vehicles Without Sir

Pinpoint Test E: The Power Seat Does Not Move Horizontally/Vertically - Passenger, Vehicles Without 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. E1 DETERMINE WHICH DIRECTION HAS FAILED 
    • Key in OFF position.
    • Operate the power seat forward and rearward.
    • Will the track move horizontally? 
    1. YES  : Go to  E5.
    2. NO  : Go to  E2.
  2. E2 CHECK THE VOLTAGE TO FORWARD REVERSE SEAT MOTOR 
    • Disconnect: Power Seat Motor Assembly C3015
    • Measure the voltage between power seat motor assembly C3015-1, circuit 987 (RD/WH), harness side and C3015-4, circuit 986 (YE/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 - Bucket and 40 Percent  in this article. TEST the system for normal operation.
    2. NO  : Go to  E3.
  3. E3 CHECK CIRCUIT 986 (YE/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C330
    • Measure the resistance between seat control switch C330-8, circuit 986 (YE/WH), harness side and power seat motor assembly C3015-4, circuit 986 (YE/WH), harness side and between seat control switch C330-8, circuit 986 (YE/WH), harness side and ground.
      Fig 2: Checking Circuit 986 (YE/WH) For Open And Short To Ground
      GF0004942Courtesy 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  E4.
    2. NO  : REPAIR circuit 986 (YE/WH). TEST the system for normal operation.
  4. E4 CHECK CIRCUIT 987 (RD/WH) FOR AN OPEN AND SHORT TO GROUND 
    • Measure the resistance between seat control switch C330-3, circuit 987 (RD/WH), harness side and power seat motor assembly C3015-1, circuit 987 (RD/WH), harness side and between seat control switch C330-3, circuit 987 (RD/WH), harness side and ground.
      Fig 3: Checking Circuit 987 (RD/WH) For Open And Short To Ground
      GF0004943Courtesy 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  in this article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 987 (RD/WH). TEST the system for normal operation.
  5. E5 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  E6 .

      If only the rear tilting operates, go to  E9 .

    2. NO  : INSTALL a new seat control switch. REFER to Seat Control Switch  in this article. TEST the system for normal operation.
  6. E6 CHECK THE VOLTAGE TO THE REAR HEIGHT MOTOR 
    • Disconnect: Power Seat Motor Assembly C3015
    • Measure the voltage between power seat motor assembly C3015-5, circuit 988 (YE/LG), harness side and C3015-6, circuit 989 (RD/LG), harness side while depressing the rear tilt switch up and down.
      Fig 4: Checking Voltage To Rear Height Motor
      G03890786Courtesy 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 - Bucket and 40 Percent  in this article. TEST the system for normal operation.
    2. NO  : Go to  E7.
  7. E7 CHECK CIRCUIT 989 (RD/LG) FOR OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C330
    • Measure the resistance between seat control switch C330-1, circuit 989 (RD/LG), harness side and power seat motor assembly C3015-6, circuit 989 (RD/LG), harness side and between seat control switch C330-1, circuit 989 (RD/LG), harness side and ground.
      Fig 5: Checking Circuit 989 (RD/LG) For Open And Short To Ground
      GF0004944Courtesy 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  E8.
    2. NO  : REPAIR circuit 989 (RD/LG). TEST the system for normal operation.
  8. E8 CHECK CIRCUIT 988 (YE/LG) FOR OPEN AND SHORT TO GROUND 
    • Measure the resistance between seat control switch C330-6, circuit 988 (YE/LG), harness side and power seat motor assembly C3015-5, circuit 988 (YE/LG), harness side and between seat control switch C330-6, circuit 988 (YE/LG), harness side and ground.
      Fig 6: Checking Circuit 988 (YE/LG) For Open And Short To Ground
      GF0004945Courtesy 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  in this article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 988 (YE/LG). TEST the system for normal operation.
  9. E9 CHECK THE VOLTAGE TO FRONT HEIGHT MOTOR 
    • Disconnect: Power Seat Motor Assembly C3015
    • Measure the voltage between power seat motor assembly C3015-2, circuit 985 (RD/LB), harness side and C3015-3, circuit 984 (YE/LB), harness side while pushing the rear tilting switch up and down.
      Fig 7: Checking Voltage To Front Height Motor
      G03890783Courtesy 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 - Bucket and 40 Percent  in this article. TEST the system for normal operation.
    2. NO  : Go to  E10.
  10. E10 CHECK CIRCUIT 985 (RD/LB) FOR OPEN AND SHORT TO GROUND 
    • Disconnect: Seat Control Switch C330
    • Measure the resistance between control switch C330-7, circuit 985 (RD/LB), harness side and power seat motor assembly C3015-2, circuit 985 (RD/LB), harness side and between seat control switch C330-7, circuit 985 (RD/LB), harness side and ground.
      Fig 8: Checking Circuit 985 (RD/LB) For Open And Short To Ground
      GF0004946Courtesy 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  E11.
    2. NO  : REPAIR circuit 985 (RD/LB). TEST the system for normal operation.
  11. E11 CHECK CIRCUIT 984 (YE/LB) FOR OPEN 
    • Measure the resistance between seat control switch C330-5, circuit 984 (YE/LB), harness side and power seat motor assembly C3015-3, circuit 984 (YE/LB), harness side and between seat control switch C330-5, circuit 984 (YE/LB), harness side and ground.
      Fig 9: Checking Circuit 984 (YE/LB) For Open
      GF0004947Courtesy 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  in this article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 984 (YE/LB). TEST the system for normal operation.
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