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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1720 (Seat System - Seats) >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test O: The Power Lumbar is Inoperative - Driver >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The seat control switch is supplied battery voltage and ground. When the lumbar button (part of seat control switch) is pressed, voltage and ground are supplied to the power lumbar motor to move the lumbar mechanism in or out.

This pinpoint test is intended to diagnose the following: 

NOTE: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. O1 CHECK FOR VOLTAGE TO THE SEAT CONTROL SWITCH 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article .
    • Disconnect: Driver Seat Side Air Bag C327.
    • Disconnect: Seat Control Switch C3297 (MKZ) or C360 (Fusion/Milan).
      • 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 -- FUSION, MILAN & MKZ article.
    • Measure the voltage between seat control switch and ground.
      • For Fusion/Milan, measure the voltage between seat control switch C360-5, circuit SBB32 (VT/RD), harness side and ground.
      • For MKZ, measure the voltage between seat control switch C3297-5, circuit SBP12 (GN/RD), harness side and ground.
      Fig 1: Checking Voltage Between Seat Control Switch And Ground
      G07788720Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to O2  .
    2. No  : VERIFY Smart Junction Box (SJB) fuse 12 (7.5A) (MKZ) or Battery Junction Box (BJB) fuse 32 (30A) (Fusion/Milan) is OK. If OK, REPAIR the circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  2. O2 CHECK FOR GROUND AT THE SEAT CONTROL SWITCH 
    • Measure the resistance between seat control switch and ground.
      • For Fusion/Milan, measure the resistance between seat control switch C360-3, circuit GD126 (BK/WH), harness side and ground.
      • For MKZ, measure the resistance between seat control switch C3297-3, circuit GD126 (BK/WH), harness side and ground.
      Fig 2: Measuring Resistance Between Seat Control Switch And Ground
      G07788721Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to O3  .
    2. No  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  3. O3 CHECK VOLTAGE TO THE LUMBAR MOTOR 
    • Connect: Seat Control Switch C3297 (MKZ) or C360 (Fusion/Milan).
    • Disconnect: Power Lumbar Motor C3215.
      • NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
      Fig 3: Checking Voltage To Lumbar Motor
      G07788722Courtesy of FORD MOTOR CO.
    • Measure the voltage between power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side.
    • Operate the seat control switch in both directions.
    • Is the voltage greater than 10 volts when the seat control switch is operated and 0 volt in the rest position? 
    1. Yes  : INSTALL a new power lumbar assembly. REFER to LUMBAR ASSEMBLY  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ .

    2. No  : GO to O4  .
  4. O4 CHECK THE LUMBAR MOTOR CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: Seat Control Switch C3297 (MKZ) or C360 (Fusion/Milan).
    • Measure the resistance between:
      • seat control switch C3297-7 (MKZ) or C360-7 (Fusion/Milan), circuit CPS18 (BN/GN), harness side and ground.
      • seat control switch C3297-10 (MKZ) or C360-10 (Fusion/Milan), circuit CPS19 (GY/VT), harness side and ground.
      Fig 4: Checking Lumbar Motor Circuits For Short To Ground
      G07788723Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms  .
    1. Yes  : GO to O5  .
    2. No  : REPAIR the circuit(s). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

  5. O5 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      • seat control switch C3297-7 (MKZ) or C360-7 (Fusion/Milan), circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side.
      • seat control switch C3297-10 (MKZ) or C360-10 (Fusion/Milan), circuit CPS19 (GY/VT), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side.
      Fig 5: Checking Lumbar Motor Circuits For Open
      G07788724Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH  in this service information. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

    2. No  : REPAIR the circuit(s). TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

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