Pinpoint Test F: The Passenger Power Seat Does Not Move Horizontally/Vertically - Vehicles With Sir

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

F1 DETERMINE WHICH DIRECTION HAS FAILED
- Key in OFF position.
- Operate the power seat forward and rearward.
- Will the track move horizontally?
Result / Action to Take
- Yes : GO to F5.
- No : GO to F2.
F2 CHECK THE VOLTAGE TO FORWARD REVERSE SEAT MOTOR
- Disconnect: Power Seat Motor Assembly C3015.
- Measure the voltage between power seat motor assembly C3015, circuit 986 (YE/WH), harness side and C3015, circuit 987 (RD/WH), harness side while pushing the forward/reverse switch forward and backward.
  
  Fig 1: Checking Voltage Between Connector Terminals
  Courtesy 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?
- 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.
- No : GO to F3.
F3 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, circuit 986 (YE/WH), harness side and power seat motor assembly C3015, circuit 986 (YE/WH), harness side and between seat control switch C330, circuit 986 (YE/WH), harness side and ground.
  
  Fig 2: Checking Circuit 986 (YE/WH) For Open And Short To Ground
  Courtesy 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 F4.
- No : REPAIR circuit 986 (YE/WH). TEST the system for normal operation.
F4 CHECK CIRCUIT 987 (RD/WH) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between seat control switch C330, circuit 987 (RD/WH), harness side and power seat motor assembly C3015, circuit 987 (RD/WH), harness side and between seat control switch C330, circuit 987 (RD/WH), harness side and ground.
  
  Fig 3: Checking Circuit 987 (RD/WH) For Open And Short To Ground
  Courtesy 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 - WITH SEAT INTEGRATED RESTRAINTS (SIR) in this article. TEST the system for normal operation.
- No : REPAIR circuit 987 (RD/WH). TEST the system for normal operation.
F5 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 F6.
  If only the rear tilting operates, GO to F9.
- 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.
F6 CHECK THE VOLTAGE TO THE REAR HEIGHT MOTOR
- Disconnect: Power Seat Motor Assembly C3015.
- Measure the voltage between power seat motor assembly C3015, circuit 989 (RD/LG), harness side and C3015, circuit 988 (YE/LG), harness side while depressing the rear tilt switch up and down.
  
  Fig 4: Checking Voltage To Rear Height Motor
  Courtesy 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 - WITH SEAT INTEGRATED RESTRAINTS (SIR) in this article. TEST the system for normal operation.
- No : GO to F7.
F7 CHECK CIRCUIT 989 (RD/LG) FOR OPEN AND SHORT TO GROUND
- Disconnect: Seat Control Switch C330.
- Measure the resistance between seat control switch C330, circuit 989 (RD/LG), harness side and power seat motor assembly C3015, circuit 989 (RD/LG), harness side and between seat control switch C330, circuit 989 (RD/LG), harness side and ground.
  
  Fig 5: Checking Circuit 989 (RD/LG) For Open And Short To Ground
  Courtesy 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 F8.
- No : REPAIR circuit 989 (RD/LG). TEST the system for normal operation.
F8 CHECK CIRCUIT 988 (YE/LG) FOR OPEN AND SHORT TO GROUND
- Measure the resistance between seat control switch C330, circuit 988 (YE/LG), harness side and power seat motor assembly C3015, circuit 988 (YE/LG), harness side and between seat control switch C330, circuit 988 (YE/LG), harness side and ground.
  
  Fig 6: Checking Circuit 988 (YE/LG) For Open And Short To Ground
  Courtesy 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 - WITH SEAT INTEGRATED RESTRAINTS (SIR) in this article. TEST the system for normal operation.
- No : REPAIR circuit 988 (YE/LG). TEST the system for normal operation.
F9 CHECK THE VOLTAGE TO FRONT HEIGHT MOTOR
- Disconnect: Power Seat Motor Assembly C3015.
- Measure the voltage between power seat motor assembly C3015, circuit 985 (RD/LB), harness side and C3015, circuit 984 (YE/LB), harness side while pushing the rear tilting switch up and down.
  
  Fig 7: Checking Voltage To Front Height Motor
  Courtesy 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 motor assembly. REFER to SEAT CONTROL SWITCH - WITH SEAT INTEGRATED RESTRAINTS (SIR) in this article. TEST the system for normal operation.
- No : GO to F10.
F10 CHECK CIRCUIT 985 (RD/LB) FOR OPEN AND SHORT TO GROUND
- Disconnect: Seat Control Switch C330.
- Measure the resistance between control switch C330, circuit 985 (RD/LB), harness side and power seat motor assembly C3015, circuit 985 (RD/LB), harness side and between seat control switch C330, circuit 985 (RD/LB), harness side and ground.
  
  Fig 8: Checking Circuit 985 (RD/LB) For Open And Short To Ground
  Courtesy 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 F11.
- No : REPAIR circuit 985 (RD/LB). TEST the system for normal operation.
F11 CHECK CIRCUIT 984 (YE/LB) FOR OPEN
- Measure the resistance between seat control switch C330, circuit 984 (YE/LB), harness side and power seat motor assembly C3015, circuit 984 (YE/LB), harness side and between seat control switch C330, circuit 984 (YE/LB), harness side and ground.
  
  Fig 9: Checking Circuit 984 (YE/LB) For Open
  Courtesy 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 - WITH SEAT INTEGRATED RESTRAINTS (SIR) in this article. TEST the system for normal operation.
- No : REPAIR circuit 984 (YE/LB). TEST the system for normal operation.