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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1332 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test B: The Power Seat Does Not Move Horizontally/Vertically - Driver >> Pinpoint Test B: The Power Seat Does Not Move Horizontally/Vertically - Driver

Pinpoint Test B: The Power Seat Does Not Move Horizontally/Vertically - Driver

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
CAUTION: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
CAUTION: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: The air bag warning indicator illuminates when the correct restraints control module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. B1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION 
    • Operate the driver power seat forward and rearward.
    • Will the seat move horizontally? 
    1. YES  : Go to  B5.
    2. NO  : Go to  B2.
  2. B2 CHECK VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM article.
    • For vehicles equipped with seat side air bags, carry out the following:
      • Disconnect the driver seat side air bag C315.
      • Connect the Restraint System Diagnostic Tool to driver seat side air bag C315.
    • Disconnect: Driver Power Seat Motor C353
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES article.
      • Fig 1: Measuring Voltage
      GF0018454Courtesy of FORD MOTOR CO.
    • Measure the voltage between driver power seat motor C353-4, circuit 980 (YE/WH), harness side and C353-1, circuit 981 (RD/WH), harness side, while pushing the driver seat control switch forward and rearward.
    • Is the voltage greater than 10 volts when the seat control switch is toggled in both directions and 0 volt in the rest position? 
    1. YES  : INSTALL a new seat track. REFER to Seat Track . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : Go to  B3.
  3. B3 CHECK HORIZONTAL MOTOR CIRCUIT 980 (YE/WH) FOR AN OPEN 
    • Disconnect: Driver Seat Control Switch C519
      • Fig 2: Measuring Resistance
      GF0046602Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat control switch C519-8, circuit 980 (YE/WH), harness side and driver power seat motor C353-4, circuit 980 (YE/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  4. B4 CHECK HORIZONTAL MOTOR CIRCUIT 981 (RD/WH) FOR AN OPEN  
      Fig 3: Measuring Resistance
      GF0046603Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat control switch C519-9, circuit 981 (RD/WH), harness side and driver power seat motor C353-1, circuit 981 (RD/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  5. B5 DETERMINE THE SEAT HEIGHT ADJUST FAILURE 
    • Determine the seat height adjust failure.
    • Does the seat front or rear height adjust up and down? 
    1. YES  : If only the front height adjust operates, go to  B6.

      If only the rear height adjust operates, go to  B9.

    2. NO  : INSTALL a new seat control switch. REFER to Seat Control Switch . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  6. B6 CHECK VOLTAGE TO THE DRIVER SEAT REAR HEIGHT MOTOR 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM article.
    • For vehicles equipped with seat side air bags, carry out the following:
      • Disconnect the affected seat side air bag C315 (driver) or C316 (passenger).
      • Connect the Restraint System Diagnostic Tool to the affected seat side air bag C315 (driver) or C316 (passenger).
    • Disconnect: Driver Power Seat Motor C353
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES article.
      • Fig 4: Measuring Voltage
      GF0018451Courtesy of FORD MOTOR CO.
    • Measure the voltage between driver power seat motor C353-6, circuit 982 (YE/LG), harness side and C353-5, circuit 983 (RD/LG), harness side, while depressing the seat control switch rear height adjust up and down.
    • Is the voltage greater than 10 volts when the seat control switch is toggled in both directions and 0 volt in the rest position? 
    1. YES  : INSTALL a new seat track. REFER to Seat Track . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : Go to  B7.
  7. B7 CHECK REAR HEIGHT MOTOR CIRCUIT 982 (YE/LG) FOR AN OPEN  
    • Disconnect: Driver Seat Control Switch C519
      • Fig 5: Measuring Resistance
      GF0046604Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat control switch C519-5, circuit 982 (YE/LG), harness side and driver power seat motor C353-6, circuit 982 (YE/LG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  8. B8 CHECK REAR HEIGHT MOTOR CIRCUIT 983 (RD/LG) FOR AN OPEN  
      Fig 6: Measuring Resistance
      GF0046605Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat control switch C519-4, circuit 983 (RD/LG), harness side and driver power seat motor C353-5, circuit 983 (RD/LG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  9. B9 CHECK VOLTAGE TO THE DRIVER SEAT FRONT HEIGHT MOTOR 
    • Disconnect: Driver Power Seat Motor C353
      • Fig 7: Measuring Voltage
      GF0018446Courtesy of FORD MOTOR CO.
    • Measure the voltage between driver power seat motor C353-2, circuit 978 (YE/LB), harness side and C353-3, circuit 979 (RD/LB), while pushing the seat control switch front height adjust up and down.
    • Is the voltage greater than 10 volts when the seat control switch is toggled in both directions and 0 volt in the rest position? 
    1. YES  : INSTALL a new seat track. REFER to Seat Track . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : Go to  B10.
  10. B10 CHECK FRONT HEIGHT MOTOR CIRCUIT 978 (YE/LB) FOR AN OPEN  
    • Disconnect: Driver Seat Control Switch C519
      • Fig 8: Measuring Resistance
      GF0046606Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat control switch C519-7, circuit 978 (YE/LB), harness side and driver power seat motor C353-2, circuit 978 (YE/LB), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B11.
    2. NO  : REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  11. B11 CHECK FRONT HEIGHT MOTOR CIRCUIT 979 (RD/LB) FOR AN OPEN 
      Fig 9: Measuring Resistance
      GF0046607Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat control switch C519-1, circuit 979 (RD/LB) harness side, and driver power seat motor C353-3, circuit 979 (RD/LB), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from driver seat side air bag module C315 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C315 or passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
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